Transition Metal Chemistry最新文献

{"title":"Facile synthesis of paramagnetic Co(II)-hexaborate(2-)-based semi-organic complexes: a combined investigation on X-ray crystal structure, Hirshfeld surfaces analysis, optical and magnetic properties","authors":"Ibrahim Karoui,&nbsp;Ahlem Maalaoui,&nbsp;Sylvain Duval,&nbsp;Mohamed Rzaigui,&nbsp;Samah Akriche","doi":"10.1007/s11243-023-00549-4","DOIUrl":"10.1007/s11243-023-00549-4","url":null,"abstract":"<div><p>Two new paramagnetic hybrid cobalt(II)-hexaborate(2-)-based semi-organic complexes: (2A3MP)₂[Co{κ³O–B₆O₇(OH)₆}₂].2H₂O (<b>1</b>) and (2A4MP)₂[Co{κ³O–B₆O₇(OH)₆}₂].2H₂O (<b>2</b>) (2A3MP = 2-amino-3-methylpyridinium, 2A4MP = 2-amino-4-methylpyridinium) have been obtained and characterized by X-ray diffraction, FT-IR, TG–DTA, optical and magnetic measurements. X-ray diffraction revealed two isostructural compounds based on Co(II) complexes of bis(κ³O-donor hexaborate(2-)) ligands, [Co{κ³O–B₆O₇(OH)₆}₂]²⁻, differing only in the organic counter cation. The hydrated oxidopolyborate anions are extensively H-bounded to form 3D-porous supramolecular anionic frameworks. In both <b>1</b> and <b>2</b> isostructures, <i>2A3MP</i> and <i>2A4MP</i> cations are present in the created voids of the inorganic frameworks through a set of H-bonds with 58.5 and 60.5% H…O/O…H intercontact contributions, respectively, for <b>1</b> and <b>2</b> as confirmed by Hirshfeld surfaces analysis. The optical band gap of Co(II) complexes ranges between 2.72 and 2.82 eV. Both compounds exhibited well-resolved paramagnetic properties with magnetic susceptibility values ranging between 0.9552 cm³ mol⁻¹ (at 2 K) and 0.0088 cm³ mol⁻¹ (at 300 K), typical of octahedral Co(II) complexes.</p></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"48 6","pages":"365 - 375"},"PeriodicalIF":1.7,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71909829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and fabrication of novel coordination polymers containing Co(II), Ni(II), and Cu(II) for electrochemical detection of both ascorbic acid and Cr(VI)","authors":"Xiaohui Li,&nbsp;Bingqian Wang,&nbsp;Yue Gao,&nbsp;Guocheng Liu,&nbsp;Xiuli Wang","doi":"10.1007/s11243-023-00544-9","DOIUrl":"10.1007/s11243-023-00544-9","url":null,"abstract":"<div><p>For the rapid detection of ascorbic acid (AA) and Cr(VI), three novel 2D coordination polymers (CP) with different metal centers [Co(L)(5-NIPA)(H₂O)]·H₂O (<b>1</b>), [Ni(L)(5-NIPA)(H₂O)]·H₂O (<b>2</b>) and [Cu(L)(5-NIPA)]·H₂O (<b>3</b>) were synthesized by the traditionally hydrothermal method (L = N,N′-bis(pyridine-3-ylmethyl)-4-(4-carboxybenzyl)oxybenzamide, 5-NIPA = 5-nitroisophthalic acid). CPs <b>1</b> and <b>2</b> are isomorphic 2D regular (4,4)-connected networks, and CP <b>3</b> has a twisted 2D lamellar structure. All of the above complexes present highly sensitive and selective electrocatalytic sensing performances for AA and Cr(VI). The detection limits of the three complexes were 0.320, 3.360 and 3.600 μM for AA, and 0.2349, 0.9928 and 3.6054 μM for Cr(VI), respectively.</p></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"48 5","pages":"307 - 314"},"PeriodicalIF":1.7,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11243-023-00544-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6720313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Zn (II) octahedral complex with new ketimine ligand: design, synthesis and single-crystal studies","authors":"Fawad Ahmad,&nbsp;Nasir Abbas,&nbsp;Ayesha Ihsan,&nbsp;Muhammad Saqib Ghafoor,&nbsp;Ghulam Shabir,&nbsp;Aamer Saeed","doi":"10.1007/s11243-023-00547-6","DOIUrl":"10.1007/s11243-023-00547-6","url":null,"abstract":"<div><p>The present investigation deals with the synthesis and single-crystal X-ray analysis of Zu (II) coordination complex of ketimine ligand which was obtained by reaction of dehydroacetic acid with carbohydrazide (<b>3</b>) and characterized the title compound with elemental analysis, multinuclear (¹H and ¹³C) NMR, UV visible, and FTIR spectral data. It crystallized in orthorhombic crystal system with space group Pbcn and unit cell dimensions: <i>a</i> = 18.7959 (4), <i>b</i> = 11.2890 (2) and <i>c</i> = 13.4480 (3) Å, and <i>α</i> = <i>β</i> = <i>γ</i> = 90°. The suggested geometry obtained after experimental analysis was distorted octahedral due to some angle strain between axial homonuclear N donor atoms around central Zn, and it was very close to the expected geometry. The DNA co-relation analysis was carried out by using fixed concentration of Calf Thymus DNA against the solution of analyte using UV spectroscopy. The ligand and metal complexes were examined for antibacterial and fungal activities against <i>E. coli</i>, <i>M. luteus</i>, <i>E. aerogenes</i>, <i>S. aureus,</i> and <i>C. albicans,</i> and the titled complex was found to be active against all the tested strains.</p></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"48 5","pages":"343 - 351"},"PeriodicalIF":1.7,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6720315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stereospecific formation of vanadium mandelato complexes with [Fe(2,2′-bipyridine)3]2+ as a counter ion","authors":"Peter Schwendt,&nbsp;Róbert Gyepes,&nbsp;Jozef Tatiersky,&nbsp;Juraj Filo,&nbsp;Marek Bujdoš,&nbsp;Dominika Zákutná,&nbsp;Lukáš Krivosudský","doi":"10.1007/s11243-023-00543-w","DOIUrl":"10.1007/s11243-023-00543-w","url":null,"abstract":"<div><p>Two vanadium complexes of mandelic acid having [Fe(<i>bpy</i>)₃]²⁺ as counterion, [Fe(<i>bpy</i>)₃][V₂O₄(<i>rac</i>-<i>mand</i>)₂]·4.9H₂O·0.1CH₃CN (<b>1</b>, FeV₂L₂) and (H₃O)[Fe(<i>bpy</i>)₃]₄[V₃O₇(<i>S</i>-<i>mand</i>)₂]₃·28H₂O (<b>2</b>, FeV₃L₂) (<i>bpy</i> = 2,2’-bipyridine, <i>mand</i>^2– = mandelato ligand, C₈H₆O₃^2–) have been synthesized and characterized by single crystal X-ray diffraction and spectral methods. The FeSO₄—<i>bpy</i>—KVO₃—H₂<i>mand</i>—H₂O—CH₃CN system exhibits a stereospecific behaviour: while from the system including racemic mandelic acid only the complex of the V₂L₂ type (<b>1</b>) could be obtained in crystalline form, the system with <i>S</i>-mandelic acid afforded the V₃L₂ (<b>2</b>) complex as the single crystalline product. All vanadium atoms exhibit tetragonal pyramidal coordination geometry with oxygen donor atoms of the oxido ligands and carboxylate anion. The stereospecific behaviour was investigated using the ⁵¹ V NMR spectroscopy, which revealed different composition of systems with racemic mandelic acid and <i>S</i>-mandelic acid after some preliminary period (≈ 15 days). The compound <b>2</b> is chiral non-racemic compound (space group <i>P</i>2₁2₁2), the structure of which contains Δ-[Fe(<i>bpy</i>)₃]²⁺ cations and [V₃O₇(<i>S</i>-<i>mand</i>)₂]^3– anions.</p><h3>Graphical abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"48 5","pages":"297 - 305"},"PeriodicalIF":1.7,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11243-023-00543-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6720319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Inhibition of cell proliferation of iridium(III) polypyridyl complexes on osteosarcoma U2OS cells through PI3K/AKT/mTOR pathway","authors":"Si-Hong Liu,&nbsp;Fu-Li Xie,&nbsp;Jian-Wei Zhu,&nbsp;Hui-Hua Xu,&nbsp;Bi-Wen Wu,&nbsp;Jia-Jun Li,&nbsp;Pei-Pei Wang,&nbsp;Yong Wu,&nbsp;Han Yan","doi":"10.1007/s11243-023-00546-7","DOIUrl":"10.1007/s11243-023-00546-7","url":null,"abstract":"<div><p>In this article, three iridium(III) complexes [Ir(bzq)₂(NPIP)](PF₆) (NPIP = 2-nitrophenyl-1<i>H</i>-imidazo[4,5-f][1,10]phenanthroline) <b>(</b>Ir1), [Ir(bzq)₂(MNPIP)](PF₆) (MNPIP = 3-nitrophenyl-1<i>H</i>-imidazo[4,5-f][1,10]phenanthroline) (Ir2) and [Ir(bzq)₂(PNPIP)](PF₆) (PNPIP = 4-nitrophenyl-1<i>H</i>-imidazo[4,5-f][1,10]phenanthroline) (Ir3) were synthesized and characterization. The cytotoxicity in vitro of the complexes Ir1, Ir2 and Ir3 toward human tibial osteosarcoma cell U2OS, human osteosarcoma cell HOS, human osteoblast-like cells MG-63, and non-cancer cell LO2 was evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) method. Complex <b>Ir1</b> displays high anticancer activity against U2OS cells with a low IC₅₀ value of 7.4 ± 0.04 μM, while Ir2 and Ir3 show no cytotoxic activity toward the above selected cancer cells. The colonies and wound healing show that Ir1 can effectively inhibit the cell proliferation and migration. The apoptosis was performed using Annex V/propidium iodide (PI) double staining and the obtained results show that Ir1 can induce apoptosis. The cell cycle distribution demonstrates that Ir1 prevents the cell growth at the G0/G1 phase. Ir1 locates at the mitochondria, causes an increase of intracellular ROS levels, induces a decrease of mitochondrial membrane potential. Additionally, Ir1 can cause autophagy, regulate the expression of Bcl-2 family proteins, inhibit the expression of PI3K, AKT, mTOR and p-mTOR. Taken together, Ir1 induces cell death through a ROS-mediated mitochondrial dysfunction and inhibition of PI3K/AKT/mTOR signaling pathway.</p></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"48 5","pages":"331 - 342"},"PeriodicalIF":1.7,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11243-023-00546-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6720316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photocatalytic dye degradation efficiency and reusability of potassium polyacrylate hydrogel loaded Ag@ZnO nanocomposite","authors":"Abdelhakim Boutalbi,&nbsp;Hamdi Ali Mohammed,&nbsp;Souhaila Meneceur,&nbsp;Laouini Salah Eddine,&nbsp;Johar Amin Ahmed Abdullah,&nbsp;Fahad Alharthi,&nbsp;Gamil Gamal Hasan","doi":"10.1007/s11243-023-00548-5","DOIUrl":"10.1007/s11243-023-00548-5","url":null,"abstract":"<div><p>The widespread use of nonbiodegradable synthetic dyes in various industries has led to significant toxic contamination and water pollution. The release of these dyes into aquatic environments poses serious risks to human health and ecosystems. To address this issue, rapid and efficient techniques for dye removal or transformation are required. In this article, we present a pioneering approach for the synthesis of a highly efficient photocatalyst material, PPAH/Ag@ZnO nanocomposites, for the degradation of organic dyes in wastewater. By integrating silver (Ag) and zinc oxide (ZnO) nanoparticles within the potassium polyacrylate hydrogel (PPAH) matrix, a two-step method was employed to create stable and effective photocatalytic nanocomposites. The successful formation of PPAH/Ag@ZnO nanocomposites was confirmed through comprehensive characterization using UV–visible spectroscopy, FTIR, XRD, and SEM techniques. The photocatalytic performance of the PPAH/Ag@ZnO nanocomposite was evaluated for the degradation of o-toluidine blue (o-TB) and 4-bromophenol (4-Bph) under sunlight. The experimental results demonstrate that the PPAH/Ag@ZnO nanocomposite effectively degrades 98.77% of o-TB and 98.05% of 4-Bph. Moreover, the kinetics of the photocatalytic degradation reactions were investigated, revealing apparent reaction rate constants of 0.0229 and 0.018 min⁻¹ for the degradation of o-TB and 4-Bph, respectively. Additionally, the reusability of the prepared PPAH/Ag@ZnO photocatalyst was evaluated over 5 consecutive cycles, demonstrating its exceptional effectiveness and stability. This innovative approach with hydrogel-based nanoparticles offers a potential breakthrough in the field of photocatalysis for addressing water contamination caused by organic dyes.</p></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"48 5","pages":"353 - 363"},"PeriodicalIF":1.7,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11243-023-00548-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6720314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogen-bonded supramolecular structures in copper(II) nitrobenzoates with N-methylnicotinamide: synthesis, supramolecular structure, Hirshfeld surface analysis, spectral and DFT study","authors":"Milan Piroš,&nbsp;Zuzana Vasková,&nbsp;Milan Mazúr,&nbsp;Ján Moncoľ,&nbsp;Jozef Švorec","doi":"10.1007/s11243-023-00542-x","DOIUrl":"10.1007/s11243-023-00542-x","url":null,"abstract":"<div><p>The synthesis of six new copper(II) nitrobenzoate complexes with <i>N</i>-methylnicotinamide, used as an auxiliary ligand for a supramolecular interaction study, is reported. Crystal structures of six novel compounds [Cu(2-NO₂bz)₂(mna)₂(H₂O)₂] (<b>1</b>), [Cu(2-NO₂bz)₂(mna)₂(H₂O)₂]∙2H₂O (<b>2</b>), [Cu(3-NO₂bz)₂(mna)₂(H₂O)₂] (<b>3</b>), [Cu(3,5-(NO₂)₂bz)₂(mna)₂(H₂O)₂]∙2H₂O (<b>4</b>), [Cu(4-NO₂bz)₂(mna)₂(H₂O)₂]∙2(4-NO₂bzH) (<b>5</b>) and [Cu(3,5-(NO₂)₂bz)₂(mna)(H₂O)₃] (<b>6</b>) (mna = <i>N</i>-methylnicotinamide, 2-NO₂bz = 2-nitrobenzoate, 3-NO₂bz = 3-nitrobenzoate, 4-NO₂bz = 4-nitrobenzoate, 3,5-(NO₂)₂bz = 3,5-dinitrobenzoate) were determined by X-ray analysis. Compounds <b>1</b>–<b>6</b> are mononuclear with a tetragonal-bipyramidal geometry around the Cu²⁺ ion. The molecules of the studied complexes are mostly linked by a combination of N–H…O and O–H…O hydrogen bonds between <i>N</i>-methylnicotinamide and water molecules into supramolecular hydrogen-bonded coordination chains and networks. Intermolecular interactions in the supramolecular structures were also studied using Hirshfeld surface analysis. In addition, the complexes <b>1–6</b> have been characterised by elemental analysis, IR, UV–Vis and EPR spectroscopy. Density functional theory calculations were performed in order to reproduce the EPR magnetic parameters. DFT calculations of the EPR parameters show a good agreement with the experimental results.</p></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"48 5","pages":"281 - 295"},"PeriodicalIF":1.7,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11243-023-00542-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6720317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of alkyl substituents in the β-side on the conformation, molecular structure, and copper-oxygen bond strength of bis(β-diketonato)copper(II) complexes by DFT results and experimental vibrational and UV spectra","authors":"Mahnoosh Hakimi-Tabar,&nbsp;Mohammad Vakili,&nbsp;Vahidreza Darugar,&nbsp;Mahmood Akbari,&nbsp;Sayyed Faramarz Tayyari,&nbsp;Mohammad Reza Housaindokht","doi":"10.1007/s11243-023-00545-8","DOIUrl":"10.1007/s11243-023-00545-8","url":null,"abstract":"<div><p>The conformation, geometry, and relative energies of bis (2,6-dimethylheptane-3,5-dionato)copper(II), (Cu(DIMHD)₂), and bis (5,5-dimethylhexane-2,4-dionato)copper(II), Cu(DMHD)₂ have been assayed through using calculated results from atoms-in-molecules (AIM) analysis, time-dependent density functional theory (TD-DFT), natural bond orbital (NBO), and density functional theory (DFT). The electronic and vibrational spectra of these compounds have also been studied using experimental infrared, Raman, and ultraviolet (UV) spectra. All theoretical and empirical vibrational frequencies of the mentioned compounds have been assigned. The DFT was used to characterize the conformers of the complexes mentioned above, as well as the observed vibrational and UV spectra. Similar complexes, including copper (II) acetylacetonate Cu(AA)₂, bis(3,5-heptanedionato)copper(II) (Cu(HPD)₂), and copper (II) 2,2,6,6-tetramethylheptane-3,5-dionate (Cu(TMHD)₂), have been chosen to evaluate the influence of isopropyl (iPr) and tert-Butyl (<i>t</i>-Bu) groups substituents instead of methyl and ethyl groups. All experimental, spectroscopic, and DFT results confirmed that the O-Cu bond strength in Cu(DIMHD)₂ and Cu(DMHD)₂ is between Cu(TMHD)₂ and Cu(AA)₂ and close to Cu(HPD)₂.</p></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"48 5","pages":"315 - 329"},"PeriodicalIF":1.7,"publicationDate":"2023-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11243-023-00545-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6720318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of a new unsymmetrical bis (imino) pyridine Schiff-base co-complex with an ionic liquid group as a recyclable green catalyst to prepare chromenes derivatives from benzylic alcohol","authors":"Reza Mohammadian,&nbsp;Reza Sandaroos,&nbsp;Ali Allahresani","doi":"10.1007/s11243-023-00541-y","DOIUrl":"10.1007/s11243-023-00541-y","url":null,"abstract":"<div><p>The preparation and characterization of a new unsymmetrical ligand on Fe₃O₄@SiO₂ with its cobalt complex including an ionic liquid (ILs) group by ¹H-NMR, ¹³C-NMR, FTIR, SEM, EDX, TGA, XRD, and VSM. The catalyst was used in the reaction to prepare chromene compounds from alcohol. Catalyst amount, temperature, solvent, and solvent amount were investigated as factors affecting the reaction. For the synthesis of chromene derivatives at optimum conditions, the alcohol derivatives were first oxidized by the catalyst, followed by malononitrile and diketone additions to the reaction vessel. Recovery and reusability of the catalyst were investigated, which showed excellent results. The presence of ionic liquid groups increased the solubility of the heterogeneous catalyst in green solvents, which increased the efficiency and reduced the reaction time.</p><h3>Graphical abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"48 4","pages":"269 - 280"},"PeriodicalIF":1.7,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4752448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First molecular complexes of Cr(III) with 2,6-diacetylpyridine-bis(thiosemicarbazone): synthesis and crystal structures","authors":"Leokadiya V. Zorina,&nbsp;Sergey V. Simonov,&nbsp;Valentina D. Sasnovskaya,&nbsp;Eduard B. Yagubskii","doi":"10.1007/s11243-023-00536-9","DOIUrl":"10.1007/s11243-023-00536-9","url":null,"abstract":"<div><p>The first molecular complexes of Cr(III) with chelating 2,6-diacetylpyridine-bis(thiosemicarbazone) Schiff-base ligand (H₂daptsc), [Cr(Hdaptsc)(H₂O)_1.4(CH₃OH)_0.6](NO₃)₂·1.4CH₃OH (<b>1</b>), [Cr(Hdaptsc)(H₂O)₂](NO₃)₂·1.3C₂H₅OH (<b>2</b>), [Cr(Hdaptsc)(H₂O)₂](NO₃)₂·H₂O (<b>3</b>), [Cr(H₂daptsc)(H₂O)₂](NO₃)₃·<span>2h</span>₂O (<b>4</b>), [Cr(Hdaptsc)(N₃)₂]·CH₃OH (<b>5</b>), [Cr(Hdaptsc)(N₃)₂]·1.25H₂O (<b>6</b>) have been synthesized, and their crystal structures have been studied. Structural analysis has shown that in all the crystals, the Cr(III) cation is seven-coordinated by N₃S₂ atoms of the pentadentate ligand in the equatorial plane and two O or N atoms of water/methanol or N₃‾ axial ligands. The pentadentate ligand is fully protonated in <b>4</b> and mono-deprotonated in one hydrazinic –NH group in all the other compounds. The degree of deprotonation depends on the pH of the reaction medium. The remaining proton in Hdaptscˉ is ordered and localized on one side of the ligand. As a result, the Hdaptscˉ ligand possesses a pronounced difference in Cr-S/N bond distances for the neutral protonated and negatively charged deprotonated halves due to the strong Jahn–Teller effect for the high-spin 3d³ configuration in the pentagonal bipyramidal (PBP) ligand field.</p><h3>Graphical abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"48 4","pages":"215 - 226"},"PeriodicalIF":1.7,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4576718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}