Märt Lõkov, Carmen Kesküla, Sofja Tshepelevitsh, Marta-Lisette Pikma, Jaan Saame, Dmitri Trubitsõn, Tõnis Kanger, Ivo Leito
{"title":"The Acidity of Weak NH Acids: Expanding the p<i>K</i> <sub>a</sub> Scale in Acetonitrile.","authors":"Märt Lõkov, Carmen Kesküla, Sofja Tshepelevitsh, Marta-Lisette Pikma, Jaan Saame, Dmitri Trubitsõn, Tõnis Kanger, Ivo Leito","doi":"10.1021/acsorginorgau.4c00095","DOIUrl":"10.1021/acsorginorgau.4c00095","url":null,"abstract":"<p><p>Nitrogen heterocycles and aromatic amines are well-known and widely used compounds that are usually not seen as acids, although in organic solvents like acetonitrile (MeCN) or dimethyl sulfoxide (DMSO) their acidic properties can be observed. In this work, the acidities (p<i>K</i> <sub>a</sub> values) of 37 such weak NH acids were determined in acetonitrile and presented together with computational gas-phase acidities and literature p<i>K</i> <sub>a</sub> values in DMSO. In the course of the work the weakest acids range (from p<i>K</i> <sub>a</sub> 29 upward) of the MeCN acidity scale has been revised and expanded to around 33.5 by adding 31 compounds in that specific region and the span of experimental p<i>K</i> <sub>a</sub> values in MeCN is now more than 30 orders of magnitude. The relations between the structure and acidity of a selection of the studied compounds have been investigated in MeCN and DMSO. The measured p<i>K</i> <sub>a</sub> values in MeCN and the gathered p<i>K</i> <sub>a</sub> values in DMSO were used for a correlation analysis between the two solvents and for assessing the quality of p<i>K</i> <sub>a</sub> conversion equations. A number of p<i>K</i> <sub>a</sub> values have been predicted in MeCN from p<i>K</i> <sub>a</sub> values in DMSO via the correlation analysis and p<i>K</i> <sub>a</sub> conversion equations.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":"5 2","pages":"144-155"},"PeriodicalIF":3.3,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11969276/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143796480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS Organic & Inorganic AuPub Date : 2025-03-13DOI: 10.1021/acsorginorgau.4c0009510.1021/acsorginorgau.4c00095
Märt Lõkov*, Carmen Kesküla, Sofja Tshepelevitsh, Marta-Lisette Pikma, Jaan Saame, Dmitri Trubitsõn, Tõnis Kanger and Ivo Leito,
{"title":"The Acidity of Weak NH Acids: Expanding the pKa Scale in Acetonitrile","authors":"Märt Lõkov*, Carmen Kesküla, Sofja Tshepelevitsh, Marta-Lisette Pikma, Jaan Saame, Dmitri Trubitsõn, Tõnis Kanger and Ivo Leito, ","doi":"10.1021/acsorginorgau.4c0009510.1021/acsorginorgau.4c00095","DOIUrl":"https://doi.org/10.1021/acsorginorgau.4c00095https://doi.org/10.1021/acsorginorgau.4c00095","url":null,"abstract":"<p >Nitrogen heterocycles and aromatic amines are well-known and widely used compounds that are usually not seen as acids, although in organic solvents like acetonitrile (MeCN) or dimethyl sulfoxide (DMSO) their acidic properties can be observed. In this work, the acidities (p<i>K</i><sub>a</sub> values) of 37 such weak NH acids were determined in acetonitrile and presented together with computational gas-phase acidities and literature p<i>K</i><sub>a</sub> values in DMSO. In the course of the work the weakest acids range (from p<i>K</i><sub>a</sub> 29 upward) of the MeCN acidity scale has been revised and expanded to around 33.5 by adding 31 compounds in that specific region and the span of experimental p<i>K</i><sub>a</sub> values in MeCN is now more than 30 orders of magnitude. The relations between the structure and acidity of a selection of the studied compounds have been investigated in MeCN and DMSO. The measured p<i>K</i><sub>a</sub> values in MeCN and the gathered p<i>K</i><sub>a</sub> values in DMSO were used for a correlation analysis between the two solvents and for assessing the quality of p<i>K</i><sub>a</sub> conversion equations. A number of p<i>K</i><sub>a</sub> values have been predicted in MeCN from p<i>K</i><sub>a</sub> values in DMSO via the correlation analysis and p<i>K</i><sub>a</sub> conversion equations.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":"5 2","pages":"144–155 144–155"},"PeriodicalIF":3.3,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsorginorgau.4c00095","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ali Azmy, Alissa Brooke Anderson, Mina Bagherifard, Neelam Tariq, Kamal E S Nassar, Ioannis Spanopoulos
{"title":"When Pore Met Semi: Charting the Rise of Porous Metal Halide Semiconductors.","authors":"Ali Azmy, Alissa Brooke Anderson, Mina Bagherifard, Neelam Tariq, Kamal E S Nassar, Ioannis Spanopoulos","doi":"10.1021/acsorginorgau.4c00093","DOIUrl":"10.1021/acsorginorgau.4c00093","url":null,"abstract":"<p><p>Metal halide semiconductors (MHS) are a versatile class of materials with fully customizable mechanical and optoelectronic properties that have proven to be prominent candidates in numerous impactful applications. Finding a way to generate porosity in MHS would bestow upon them an additional node in property engineering, thus allowing them to be utilized in uncharted technologies. Motivated by this promise, we developed a general strategy to render the MHS porous. We employed molecular cages as structure-directing agents and countercations, which fostered a new family of materials: porous metal halide semiconductors (PMHS). The presence of molecular cages gave rise to ultramicroporous structures imposed by the organic part cavities and a record water stability performance of 27 months so far. In this Perspective, we discuss the principles and promises of PMHS, which combine the merits of porous and electronic compounds.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":"5 2","pages":"87-96"},"PeriodicalIF":3.3,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11969274/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143796488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS Organic & Inorganic AuPub Date : 2025-02-28DOI: 10.1021/acsorginorgau.4c0009310.1021/acsorginorgau.4c00093
Ali Azmy, Alissa Brooke Anderson, Mina Bagherifard, Neelam Tariq, Kamal E. S. Nassar and Ioannis Spanopoulos*,
{"title":"When Pore Met Semi: Charting the Rise of Porous Metal Halide Semiconductors","authors":"Ali Azmy, Alissa Brooke Anderson, Mina Bagherifard, Neelam Tariq, Kamal E. S. Nassar and Ioannis Spanopoulos*, ","doi":"10.1021/acsorginorgau.4c0009310.1021/acsorginorgau.4c00093","DOIUrl":"https://doi.org/10.1021/acsorginorgau.4c00093https://doi.org/10.1021/acsorginorgau.4c00093","url":null,"abstract":"<p >Metal halide semiconductors (MHS) are a versatile class of materials with fully customizable mechanical and optoelectronic properties that have proven to be prominent candidates in numerous impactful applications. Finding a way to generate porosity in MHS would bestow upon them an additional node in property engineering, thus allowing them to be utilized in uncharted technologies. Motivated by this promise, we developed a general strategy to render the MHS porous. We employed molecular cages as structure-directing agents and countercations, which fostered a new family of materials: porous metal halide semiconductors (PMHS). The presence of molecular cages gave rise to ultramicroporous structures imposed by the organic part cavities and a record water stability performance of 27 months so far. In this Perspective, we discuss the principles and promises of PMHS, which combine the merits of porous and electronic compounds.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":"5 2","pages":"87–96 87–96"},"PeriodicalIF":3.3,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsorginorgau.4c00093","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS Organic & Inorganic AuPub Date : 2025-02-25DOI: 10.1021/acsorginorgau.5c0001510.1021/acsorginorgau.5c00015
Paul D. Goring, Amelia Newman, Christopher W. Jones* and Shelley D. Minteer*,
{"title":"Celebrating 5 Years of the ACS Au Journal Family","authors":"Paul D. Goring, Amelia Newman, Christopher W. Jones* and Shelley D. Minteer*, ","doi":"10.1021/acsorginorgau.5c0001510.1021/acsorginorgau.5c00015","DOIUrl":"https://doi.org/10.1021/acsorginorgau.5c00015https://doi.org/10.1021/acsorginorgau.5c00015","url":null,"abstract":"","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":"5 2","pages":"84–86 84–86"},"PeriodicalIF":3.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsorginorgau.5c00015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Paul D Goring, Amelia Newman, Christopher W Jones, Shelley D Minteer
{"title":"Celebrating 5 Years of the ACS Au Journal Family.","authors":"Paul D Goring, Amelia Newman, Christopher W Jones, Shelley D Minteer","doi":"10.1021/acsorginorgau.5c00015","DOIUrl":"https://doi.org/10.1021/acsorginorgau.5c00015","url":null,"abstract":"","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":"5 2","pages":"84-86"},"PeriodicalIF":3.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11969271/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143796304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS Organic & Inorganic AuPub Date : 2025-02-21DOI: 10.1021/acsorginorgau.5c0000510.1021/acsorginorgau.5c00005
Pengfei Ji, Xing-Feng Pan, Xinxin Qi* and Xiao-Feng Wu*,
{"title":"One-Pot NIS-Promoted Cyclization/Palladium-Catalyzed Carbonylation for the Selective Synthesis of HFIP Ester-Containing Indenes and Thiochromenes","authors":"Pengfei Ji, Xing-Feng Pan, Xinxin Qi* and Xiao-Feng Wu*, ","doi":"10.1021/acsorginorgau.5c0000510.1021/acsorginorgau.5c00005","DOIUrl":"https://doi.org/10.1021/acsorginorgau.5c00005https://doi.org/10.1021/acsorginorgau.5c00005","url":null,"abstract":"<p >Practical and atom-economic procedures for the selective synthesis of HFIP ester-containing indenes/thiochromenes from the same propargylic thioethers and HFIP have been developed via one-pot NIS-promoted cyclization/palladium-catalyzed carbonylation. Solvent plays an important role in this transformation, and the reactions proceed selectively and efficiently to afford a variety of HFIP ester-containing indenes and thiochromenes in moderate to excellent yields. In addition, the use of formic acid as the CO source could avoid manipulation of toxic CO gas.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":"5 2","pages":"156–163 156–163"},"PeriodicalIF":3.3,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsorginorgau.5c00005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pengfei Ji, Xing-Feng Pan, Xinxin Qi, Xiao-Feng Wu
{"title":"One-Pot NIS-Promoted Cyclization/Palladium-Catalyzed Carbonylation for the Selective Synthesis of HFIP Ester-Containing Indenes and Thiochromenes.","authors":"Pengfei Ji, Xing-Feng Pan, Xinxin Qi, Xiao-Feng Wu","doi":"10.1021/acsorginorgau.5c00005","DOIUrl":"10.1021/acsorginorgau.5c00005","url":null,"abstract":"<p><p>Practical and atom-economic procedures for the selective synthesis of HFIP ester-containing indenes/thiochromenes from the same propargylic thioethers and HFIP have been developed via one-pot NIS-promoted cyclization/palladium-catalyzed carbonylation. Solvent plays an important role in this transformation, and the reactions proceed selectively and efficiently to afford a variety of HFIP ester-containing indenes and thiochromenes in moderate to excellent yields. In addition, the use of formic acid as the CO source could avoid manipulation of toxic CO gas.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":"5 2","pages":"156-163"},"PeriodicalIF":3.3,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11969275/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143796347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Johannes Schöntag, Theresa Hettiger, William Roberts, Marcus Scheele, Markus Ströbele, Holger F Bettinger
{"title":"Rearrangement Cascade Initiated by Nucleophilic Benzyne Attack on 3,6-Di(2-pyridyl)-1,2-diazines.","authors":"Johannes Schöntag, Theresa Hettiger, William Roberts, Marcus Scheele, Markus Ströbele, Holger F Bettinger","doi":"10.1021/acsorginorgau.4c00070","DOIUrl":"10.1021/acsorginorgau.4c00070","url":null,"abstract":"<p><p>Aryne intermediates in synthetic organic chemistry offer versatile routes to complex heterocyclic structures that are valuable in pharmaceuticals and materials science. We present a one-step aryne-mediated reaction to synthesize pyrido[1,2-<i>a</i>]indoles interconnected through vinylene or 1,2-phenylene linkers to pyridotriazoles using 2-pyridyl-substituted pyridazines and phthalazines as confirmed via single-crystal X-ray crystallography and NMR spectroscopy. This unexpected rearrangement proceeds under mild conditions. Considering that five bonds are broken and three new bonds are formed in the reaction between 3,6-di-2-pyridyl-1,2,4,5-tetrazine and benzyne, the yield of 16% is fair. Electron-rich substituents on aryne precursors destabilized the products, while electron-deficient substituents offered some stability improvements. DFT studies could reveal the mechanism of this rearrangement.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":"5 2","pages":"97-104"},"PeriodicalIF":3.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11969272/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143796378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS Organic & Inorganic AuPub Date : 2025-01-27DOI: 10.1021/acsorginorgau.4c0007010.1021/acsorginorgau.4c00070
Johannes Schöntag, Theresa Hettiger, William Roberts, Marcus Scheele, Markus Ströbele and Holger F. Bettinger*,
{"title":"Rearrangement Cascade Initiated by Nucleophilic Benzyne Attack on 3,6-Di(2-pyridyl)-1,2-diazines","authors":"Johannes Schöntag, Theresa Hettiger, William Roberts, Marcus Scheele, Markus Ströbele and Holger F. Bettinger*, ","doi":"10.1021/acsorginorgau.4c0007010.1021/acsorginorgau.4c00070","DOIUrl":"https://doi.org/10.1021/acsorginorgau.4c00070https://doi.org/10.1021/acsorginorgau.4c00070","url":null,"abstract":"<p >Aryne intermediates in synthetic organic chemistry offer versatile routes to complex heterocyclic structures that are valuable in pharmaceuticals and materials science. We present a one-step aryne-mediated reaction to synthesize pyrido[1,2-<i>a</i>]indoles interconnected through vinylene or 1,2-phenylene linkers to pyridotriazoles using 2-pyridyl-substituted pyridazines and phthalazines as confirmed via single-crystal X-ray crystallography and NMR spectroscopy. This unexpected rearrangement proceeds under mild conditions. Considering that five bonds are broken and three new bonds are formed in the reaction between 3,6-di-2-pyridyl-1,2,4,5-tetrazine and benzyne, the yield of 16% is fair. Electron-rich substituents on aryne precursors destabilized the products, while electron-deficient substituents offered some stability improvements. DFT studies could reveal the mechanism of this rearrangement.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":"5 2","pages":"97–104 97–104"},"PeriodicalIF":3.3,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsorginorgau.4c00070","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}