{"title":"Crystal structure of bis(diisopropylamino)fluoroborane","authors":"Tabea Lenz , Marian Hebenbrock","doi":"10.1107/S2056989025003160","DOIUrl":"10.1107/S2056989025003160","url":null,"abstract":"<div><div>Bis(diisopropylamino)fluoroborane was previously identified as a product of reactions of (diisopropylamino)difluoroboranes in the presence of Na/K alloy, but its structure was never elucidated. The structure reported here will contribute to the understanding of the basic binding situation and properties, and will provide a more complete picture when compared with analogous structures.</div></div><div><div>The predominantly planar structure of a fluoro-substituted bis(dialkylamino)borane, C<sub>12</sub>H<sub>28</sub>BFN<sub>2</sub>, was obtained from the reaction of boron trifluoride diethyl etherate with lithium diisopropylamide and its structure is presented here. While the B—F bond length is in the typical range of single B—F bonds, the B—N bond length indicates a partial double-bond character. The sterically demanding isopropyl groups on both amides increase the N—B—N angle and enable intermolecular van der Waals interactions.</div></div>","PeriodicalId":7367,"journal":{"name":"Acta Crystallographica Section E: Crystallographic Communications","volume":"81 5","pages":"Pages 401-404"},"PeriodicalIF":0.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143952643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Thaluru M. Mohan Kumar , Chaluvarangaiah Sowbhagya , Hemmige S. Yathirajan , Sean Parkin
{"title":"Crystal structure and Hirshfeld surface analysis of the fungicide metconazole","authors":"Thaluru M. Mohan Kumar , Chaluvarangaiah Sowbhagya , Hemmige S. Yathirajan , Sean Parkin","doi":"10.1107/S205698902500310X","DOIUrl":"10.1107/S205698902500310X","url":null,"abstract":"<div><div>The crystal structure of [(1<em>S</em>,5<em>R</em>)/(1<em>R</em>,5<em>S</em>)]-<em>cis</em>-metconazole at 100 K is presented along with a Hirshfeld surface analysis comparing the similarities of the atom–atom contacts involving the two independent molecules in the asymmetric unit.</div></div><div><div>Metconazole is a systemic triazole fungicide that inhibits the ergosterol biosynthesis pathway. It is widely used in agriculture to control fungal infections, including rusts, fusarium and septoria diseases. The molecular structure is a three-ring system, namely, 5-(4-chlorobenzyl)-2,2-dimethyl-1-(1<em>H</em>-1,2,4-triazol-1-ylmethyl)cyclopentan-1-ol, C<sub>17</sub>H<sub>22</sub>ClN<sub>3</sub>O, consisting of a cyclopentan-1-ol with 1,2,4-triazol-1-ylmethyl, <em>gem</em>-dimethyl and 4-chlorobenzyl groups attached at the 1-, 2- and 5-positions of the cyclopentanol ring. It has two stereocentres (cyclopentanol positions 1 and 5) leading to four stereoisomers, with the (1<em>S</em>,5<em>R</em>) form being the most bioactive. Despite its agricultural significance, detailed crystallographic data remain scarce. This study reports the crystal structure and Hirshfeld surface analysis of racemic <em>cis</em>-metconazole [(1<em>S</em>,5<em>R</em>)/(1<em>R</em>,5<em>S</em>)], determined in the monoclinic space group <em>P</em>2<sub>1</sub>/<em>c</em> with two independent molecules in the asymmetric unit (<em>Z</em>′ = 2). Both exhibit similar conformations, with minor differences in the cyclopentanol ring puckering and the torsion angles between the three rings. The crystal packing consists of 2<sub>1</sub>-screw-related hydrogen-bonded chains parallel to the <em>b</em> axis, with additional weak C—H⋯N and C—H⋯Cl contacts linking adjacent molecules. Hirshfeld surface analysis indicates that intermolecular interactions are dominated by contacts involving hydrogen (96.1 and 96.7% for the two molecules).</div></div>","PeriodicalId":7367,"journal":{"name":"Acta Crystallographica Section E: Crystallographic Communications","volume":"81 5","pages":"Pages 385-388"},"PeriodicalIF":0.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143956247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Helen Stoeckli-Evans , M. G. Shankar , R. Kumaravel , A. Subashini , T. Sabari Girisun , K. Ramamurthi , Monika Kučeráková , Michal Dušek , Aurélien Crochet
{"title":"Di-μ3-chlorido-1:2:3κ3Cl;2:3:4κ3Cl-di-μ2-chlorido-1:2κ2Cl;3:4κ2Cl-tetrakis[(4-amino-1,5-dimethyl-2-phenyl-2,3-dihydro-1H-pyrazol-3-one-κ2N4,O)chloridocadmium(II)] 1.7-hydrate: a new six-coordinate geometry index, τ6","authors":"Helen Stoeckli-Evans , M. G. Shankar , R. Kumaravel , A. Subashini , T. Sabari Girisun , K. Ramamurthi , Monika Kučeráková , Michal Dušek , Aurélien Crochet","doi":"10.1107/S2056989025003123","DOIUrl":"10.1107/S2056989025003123","url":null,"abstract":"<div><div>A new tetranuclear cadmium(II) complex of 4-aminoantipyrine and chloride ions was synthesized using methanol as solvent. The complex possesses inversion symmetry with two independent Cd<sup>2+</sup> ions that have different coordination spheres, one fivefold and the other sixfold. A new geometry index, τ<sub>6</sub>, is propossed to quantitatively describe the geometry of a sixfold coordinated atom.</div></div><div><div>The title centrosymmetric tetranuclear cadmium(II) complex of 4-aminoantipyrine and chloride ions, [Cd<sub>4</sub>Cl<sub>8</sub>(C<sub>11</sub>H<sub>13</sub>N<sub>3</sub>O)<sub>4</sub>]·1.7H<sub>2</sub>O, was synthesized using methanol as solvent. The two independent Cd<sup>2+</sup> ions in the asymmetric unit have different geometries; the outer Cd atoms have fivefold CdONCl<sub>3</sub> coordination spheres, while the inner Cd atoms have sixfold CdONCl<sub>4</sub> coordination spheres. The complex is consolidated by intramolecular N—H⋯O and N—H⋯Cl hydrogen bonds. In the crystal, a combination of N—H⋯Cl and O<sub>w</sub>—H⋯Cl (w = water) hydrogen bonds link the components to form chains propagating along the <em>a</em>-axis direction. The chains are crosslinked by C—H⋯Cl and C—H⋯O hydrogen bonds to form a three-dimensional structure. A new geometry index, τ<sub>6</sub>, is proposed to quantitatively estimate the geometry of a sixfold coordinated atom.</div></div>","PeriodicalId":7367,"journal":{"name":"Acta Crystallographica Section E: Crystallographic Communications","volume":"81 5","pages":"Pages 393-400"},"PeriodicalIF":0.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143955843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B. S. Palakshamurthy , H. Anil Kumar , H. C. Devarajegowda , H.T. Srinivasa , M. Harish Kumar
{"title":"Synthesis and structure of 4-bromo-2-chlorophenyl 4′-methoxy-[1,1′-biphenyl]-4-carboxylate featuring short halogen⋯oxygen contacts","authors":"B. S. Palakshamurthy , H. Anil Kumar , H. C. Devarajegowda , H.T. Srinivasa , M. Harish Kumar","doi":"10.1107/S2056989025002658","DOIUrl":"10.1107/S2056989025002658","url":null,"abstract":"<div><div>The extended structure features short halogen⋯oxygen contacts [Cl⋯O = 2.991 (3), Br⋯O = 3.139 (2) Å], forming molecular sheets lying parallel to (101).</div></div><div><div>In the title compound, C<sub>20</sub>H<sub>14</sub>BrClO<sub>3</sub>, the dihedral angles between the aromatic ring of the 4-bromo-2-chlorophenyl and the immediate neighbour and second aromatic ring of the biphenyl moiety are 80.59 (2) and 75.42 (2)°, respectively. The dihedral angle between the rings within the biphenyl moiety is 24.57 (4)°. The torsion angle associated with the ester group linking the biphenyl ring and the 4-bromo-2-chlorophenyl group is −166.6 (2)°. The extended structure features short halogen⋯oxygen contacts [Cl⋯O = 2.991 (3), Br⋯O = 3.139 (2) Å], forming molecular sheets lying parallel to (101). The Hirshfeld surface analysis reveals that the major contributions to the intermolecular interactions are from C⋯H/H⋯C (32.2%), H⋯H/H⋯H (26.3%), Br⋯H/H⋯Br (10.7%), O⋯H/H⋯O (10.4%) and Cl⋯H/H⋯Cl (7.5%) contacts.</div></div>","PeriodicalId":7367,"journal":{"name":"Acta Crystallographica Section E: Crystallographic Communications","volume":"81 5","pages":"Pages 364-367"},"PeriodicalIF":0.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143956274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Orthosilicates with glaserite-type crystal structures: Na2BaZr[SiO4]2 and Na2BaHf[SiO4]2","authors":"Hisanori Yamane , Shiro Funahashi , Naoto Hirosaki , Takashi Takeda","doi":"10.1107/S2056989025002956","DOIUrl":"10.1107/S2056989025002956","url":null,"abstract":"<div><div>The two title oxides are new isotypic silicates, crystallizing in the non-centrosymmetric space group <em>P</em>3. The crystal structures were analysed with two twin components in each case.</div></div><div><div>Single crystal particles of Na<sub>2</sub>BaZr[SiO<sub>4</sub>]<sub>2</sub> [systematic name: disodium barium zirconium bis(orthosilicate)] and Na<sub>2</sub>BaHf[SiO<sub>4</sub>]<sub>2</sub> [disodium barium hafnium bis(orthosilicate)] were extracted from grain-grown polycrystals obtained by heating compacts of binary oxide mixtures at 1473 K. Single crystal X-ray diffraction analysis revealed that these are isostructural orthosilicates with a glaserite-type crystal structure, in which all sites of <em>X</em>, <em>Y</em>, <em>M</em>, and <em>T</em> in the general formula <em>XY</em><sub>2</sub>[<em>M</em>(<em>T</em>O<sub>4</sub>)<sub>2</sub>] are fully occupied by atoms of different elements. The crystal structures of the title compounds were refined in space group <em>P</em>3 under consideration of a two-component twin model. The SiO<sub>4</sub> tetrahedra are rotated approximately ±10.2° from the mirror plane of space group <em>P</em>3<em>m</em> around an axis parallel to [001].</div></div>","PeriodicalId":7367,"journal":{"name":"Acta Crystallographica Section E: Crystallographic Communications","volume":"81 5","pages":"Pages 368-371"},"PeriodicalIF":0.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143963194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Saadet N. Guseynova , Aida I. Samigullina , Cemile Baydere Demir , Necmi Dege , Nayim Sepay , Ennio Zangrando , Khudayar I. Hasanov , Alebel N. Belay
{"title":"Synthesis, crystal structure and Hirshfeld surface analysis of 2,2-dichloro-3,3-diethoxy-1-(4-fluorophenyl)propan-1-ol","authors":"Saadet N. Guseynova , Aida I. Samigullina , Cemile Baydere Demir , Necmi Dege , Nayim Sepay , Ennio Zangrando , Khudayar I. Hasanov , Alebel N. Belay","doi":"10.1107/S2056989025002154","DOIUrl":"10.1107/S2056989025002154","url":null,"abstract":"<div><div>We have isolated and structurally chracterized 2,2-dichloro-3,3-diethoxy-1-(4-fluorophenyl)propan-1-ol by simple hydrogenation of 2,2-dichloro-3,3-diethoxy-1-(4-fluorophenyl)propan-1-one. Hirshfeld surface analysis was performed.</div></div><div><div>The title molecule, C<sub>13</sub>H<sub>17</sub>Cl<sub>2</sub>FO<sub>3</sub>, crystallizes in the orthorhombic space group <em>P</em>2<sub>1</sub>2<sub>1</sub>2<sub>1</sub> with one molecule in the asymmetric unit. The skeleton of the molecule exhibits an <em>anti</em> conformation with a C—C—C—C(Ph) torsion angle of −174.97 (18)°. The species are weakly hydrogen bonded to form a polymeric chain elongated in the direction of the <em>b</em> axis. This interaction is realised by the hydroxyl group with an ether O atom of a symmetry-related species [O—H⋯O hydrogen-bond distance of 2.975 (2) Å]. No π-stacking interaction involving the fluorobenzyl moiety is detected in the crystal structure. Hirshfeld surface analysis, confirming the O—H⋯O donor–acceptor interactions, indicates that the most important contributions to the surface contacts are H⋯H (47.0%), Cl⋯H (19.5%), C⋯H (12.1%) and F⋯H (10.7%).</div></div>","PeriodicalId":7367,"journal":{"name":"Acta Crystallographica Section E: Crystallographic Communications","volume":"81 5","pages":"Pages 444-447"},"PeriodicalIF":0.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143959504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"An Ni-based coordination polymer with a bamboo-like crystal structure","authors":"Yi Li , Wang Xie , Chen Lin","doi":"10.1107/S2056989025002993","DOIUrl":"10.1107/S2056989025002993","url":null,"abstract":"<div><div>An Ni-based coordination polymer with a crystal structure reminiscent of bamboo has been synthesized, the Ni<sup>2+</sup> ions exhibiting a slightly distorted octahedral coordination geometry with N atoms and O atoms.</div></div><div><div>An Ni-based coordination polymer, namely, poly[tetraaquabis[4,7-bis(1<em>H</em>-pyrazol-4-yl)benzo[<em>c</em>][1,2,5]thiadiazole][μ<sub>4</sub>-5,5′-(1,3,6,8-tetraoxo-1,3,6,8-tetrahydrobenzo[<em>lmn</em>][3,8]phenanthroline-2,7-diyl)diisophthalato]dinickel(II)], {[Ni<sub>2</sub>(C<sub>30</sub>H<sub>10</sub>N<sub>2</sub>O<sub>12</sub>)(C<sub>12</sub>H<sub>8</sub>N<sub>6</sub>S)<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>]·2C<sub>3</sub>H<sub>7</sub>NO·H<sub>2</sub>O}<sub><em>n</em></sub> or <strong>Ni-BIBT-BINDI</strong>, with a crystal structure reminiscent of bamboo has been synthesized, the Ni<sup>2+</sup> ions exhibiting a slightly distorted octahedral coordination geometry with N atoms and O atoms. The bond lengths of the Ni—O bonds range from 2.032 to 2.121 Å, and those of the Ni—N bonds are approximately 2.080 Å. The BINDI ligands are connected to each other by the Ni—O bonds, which form the backbone of the bamboo, while the BIBT ligands are connected to the backbone of the bamboo through Ni—N bonds and grows on both sides of the bamboo, constituting the bamboo leaves.</div></div>","PeriodicalId":7367,"journal":{"name":"Acta Crystallographica Section E: Crystallographic Communications","volume":"81 5","pages":"Pages 377-380"},"PeriodicalIF":0.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143955840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Kumaravel , Helen Stoeckli-Evans , A. Subashini , M. G. Shankar , Monika Kučeráková , Michal Dušek , Aurélien Crochet , K. Ramamurthi
{"title":"Structure of (E)-4-amino-5-{[(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)imino]methyl}-1-methyl-2-phenyl-2,3-dihydro-1H-pyrazol-3-one: aerial oxidation of 4-aminoantipyrine in dimethylformamide","authors":"R. Kumaravel , Helen Stoeckli-Evans , A. Subashini , M. G. Shankar , Monika Kučeráková , Michal Dušek , Aurélien Crochet , K. Ramamurthi","doi":"10.1107/S2056989025003676","DOIUrl":"10.1107/S2056989025003676","url":null,"abstract":"<div><div>The formation of the title compound is best explained by the aerial oxidation of the 5-methyl group of 4-aminoantipyrine to an aldehyde group, and subsequent intermolecular Schiff base formation with a second molecule of 4-aminoantipyrine. The reaction only takes place in the presence of dimethylformamide.</div></div><div><div>The title compound, C<sub>22</sub>H<sub>22</sub>N<sub>6</sub>O<sub>2</sub> (<strong>I</strong>), is the result of the aerial oxidation of the 5-methyl group of 4-aminoantipyrine to an aldehyde group followed by Schiff base formation with a second molecule of 4-aminoantipyrine. The reaction only takes place in the presence of dimethylformamide. The central unit of the molecule is close to planar, the pyrazole rings being inclined to each other by 3.74 (15)°. There is an intramolecular N—H⋯N hydrogen bond enclosing an <em>S</em>(6) ring motif and there are two further <em>S</em>(6) rings involving weak C—H⋯O=C hydrogen bonds. The molecule has an <em>E</em> configuration about the azomethine (—N=CH—) bond. In the crystal, inversion-related molecules are linked by pairs of N—H⋯O hydrogen bonds, forming dimers enclosing <em>R</em><sup>2</sup><sub>2</sub>(10) loops. The dimers are linked by C—H⋯O hydrogen bonds and C—H⋯π interactions, leading to the formation of a three-dimensional supramolecular network.</div></div>","PeriodicalId":7367,"journal":{"name":"Acta Crystallographica Section E: Crystallographic Communications","volume":"81 5","pages":"Pages 438-443"},"PeriodicalIF":0.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143955074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Imane Faraj , Lhoussaine El Ghayati , Olivier Blacque , Tuncer Hökelek , Ahmed Mazzah , El Mokhtar Essassi , Nada Kheira Sebbar
{"title":"Synthesis and crystal structure of 2-(2,4-dioxo-6-methylpyran-3-ylidene)-4-(4-hydroxyphenyl)-2,3,4,5-tetrahydro-1H-1,5-benzodiazepine","authors":"Imane Faraj , Lhoussaine El Ghayati , Olivier Blacque , Tuncer Hökelek , Ahmed Mazzah , El Mokhtar Essassi , Nada Kheira Sebbar","doi":"10.1107/S2056989025003032","DOIUrl":"10.1107/S2056989025003032","url":null,"abstract":"<div><div>In the crystal, O—H⋯O and N—H⋯O hydrogen bonds link the molecules, enclosing <em>R</em><sub>2</sub><sup>2</sup>(16) and <em>R</em><sub>2</sub><sup>2</sup>(24) ring motifs, to generate [110] chains. Very weak π–π stacking interactions between the phenyl rings of adjacent molecules help to consolidate a three-dimensional architecture.</div></div><div><div>The title compound, C<sub>21</sub>H<sub>18</sub>N<sub>2</sub>O<sub>4</sub>, contains non-planar diazepine (in a boat–sofa conformation) and pyran (envelope) rings. In the crystal, O—H⋯O and N—H⋯O hydrogen bonds link the molecules, enclosing <em>R</em><sub>2</sub><sup>2</sup>(16) and <em>R</em><sub>2</sub><sup>2</sup>(24) ring motifs, to generate [110] chains. Very weak π–π stacking interactions between the phenyl rings of adjacent molecules with an inter-centroid distance of 4.0264 (9) Å help to consolidate a three-dimensional architecture. The Hirshfeld surface analysis of the crystal structure indicates that the most important contributions for the crystal packing are from H⋯H (45.1%), H⋯O/O⋯H (23.2%) and H⋯C/C⋯H (19.2%) interactions.</div></div>","PeriodicalId":7367,"journal":{"name":"Acta Crystallographica Section E: Crystallographic Communications","volume":"81 5","pages":"Pages 381-384"},"PeriodicalIF":0.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143967503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Franziska Dorothea Klotz , Clara Alonso Felipe , Fernando Villafañe , Carsten Strohmann
{"title":"Synthesis and crystal structure study of (R,R)-TMCDA ethanol derivatives doubly protonated with FeCl4− and Cl− as counter-ions","authors":"Franziska Dorothea Klotz , Clara Alonso Felipe , Fernando Villafañe , Carsten Strohmann","doi":"10.1107/S2056989025003019","DOIUrl":"10.1107/S2056989025003019","url":null,"abstract":"<div><div>The synthesis and structural characterization of the crystal forms of (<em>R</em>,<em>R</em>)-TMCDA and its ethanol derivative, both doubly protonated with FeCl<sub>4</sub><sup>−</sup> and Cl<sup>−</sup> as counter-ions, are reported. A notable feature across both synthesized compounds is the presence of N—H⋯Cl hydrogen bonds of moderate strength in the solid state. In the case of the ethanol derivative of (<em>R</em>,<em>R</em>)-TMCDA, the structure also reveals the formation of intermolecular O–H⋯Cl hydrogen bonds.</div></div><div><div>The synthesis and structural characterization of the crystal forms of (<em>R</em>,<em>R</em>)-TMCDA and its ethanol derivative, both doubly protonated with FeCl<sub>4</sub><sup>−</sup> and Cl<sup>−</sup> as counter-ions, are reported, namely, (<em>R</em>,<em>R</em>)-<em>N</em><sup>1</sup>,<em>N</em><sup>1</sup>,<em>N</em><sup>2</sup>,<em>N</em><sup>2</sup>-tetramethylcyclohexane-1,2-bis(aminium) tetrachloridoferrate chloride, (C<sub>10</sub>H<sub>24</sub>N<sub>2</sub>)[FeCl<sub>4</sub>]Cl (<strong>1a</strong>), and (<em>R</em>,<em>R</em>)-<em>N</em><sup>1</sup>-(2-hydroxyethyl)-<em>N</em><sup>1</sup>,<em>N</em><sup>2</sup>,<em>N</em><sup>2</sup>-trimethylcyclohexane-1,2-bis(aminium) tetrachloridoferrate chloride (C<sub>11</sub>H<sub>26</sub>N<sub>2</sub>O)[FeCl<sub>4</sub>]Cl (<strong>2a</strong>). A notable feature across both synthesized compounds is the presence of N—H⋯Cl hydrogen bonds of moderate strength in the solid state. In the case of the ethanol derivative of (<em>R</em>,<em>R</em>)-TMCDA, the structure also reveals the formation of intermolecular O—H⋯Cl hydrogen bonds.</div></div>","PeriodicalId":7367,"journal":{"name":"Acta Crystallographica Section E: Crystallographic Communications","volume":"81 5","pages":"Pages 372-376"},"PeriodicalIF":0.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143963706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}