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Noor A, Qayyum S, Jabeen F. Selective synthesis of mono(amidinate) chromium(II) chloride complexes and a computational insight of their interaction with human insulin. Polyhedron 2021. [DOI: 10.1016/j.poly.2020.114942] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Noor A, Qayyum S, Schwarz S, Dietel T, Kempe R. Formation of a dimeric tungsten(i) complex via C-H activation. Dalton Trans 2020; 49:1992-1996. [PMID: 31984990 DOI: 10.1039/c9dt04847b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An aminopyridinato ligand stabilized and coordinatively unsaturated dimeric tungsten(0) complex having an electronic structure with six metal centred HOMOs (σ2,π2,π2,δ2,δ2, and δ*2) has been isolated and structurally characterized. Its reaction with a cryptand leads to a C-H bond activation of one of the isopropyl groups of the N-ligand to form a dimeric tungsten(i) complex.
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Affiliation(s)
- Awal Noor
- Department of Basic Sciences, Preparatory Year Deanship, King Faisal University, 31982 Al-Hassa, Saudi Arabia. and Lehrstuhl Anorganische Chemie II, Universität Bayreuth, 95440 Bayreuth, Germany. and Department of Chemistry, COMSATS University Islamabad, Abbottabad Campus, Pakistan
| | - Sadaf Qayyum
- Department of Basic Sciences, Preparatory Year Deanship, King Faisal University, 31982 Al-Hassa, Saudi Arabia. and Lehrstuhl Anorganische Chemie II, Universität Bayreuth, 95440 Bayreuth, Germany.
| | - Stefan Schwarz
- Lehrstuhl Anorganische Chemie II, Universität Bayreuth, 95440 Bayreuth, Germany.
| | - Thomas Dietel
- Lehrstuhl Anorganische Chemie II, Universität Bayreuth, 95440 Bayreuth, Germany.
| | - Rhett Kempe
- Lehrstuhl Anorganische Chemie II, Universität Bayreuth, 95440 Bayreuth, Germany.
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Huang YS, Huang GT, Liu YL, Yu JSK, Tsai YC. Reversible Cleavage/Formation of the Chromium-Chromium Quintuple Bond in the Highly Regioselective Alkyne Cyclotrimerization. Angew Chem Int Ed Engl 2017; 56:15427-15431. [PMID: 29045761 DOI: 10.1002/anie.201709583] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2017] [Indexed: 11/11/2022]
Abstract
Herein we report the employment of the quintuply bonded dichromium amidinates [Cr{κ2 -HC(N-2,6-i Pr2 C6 H3 )(N-2,6-R2 C6 H3 )}]2 (R=iPr (1), Me (7)) as catalysts to mediate the [2+2+2] cyclotrimerization of terminal alkynes giving 1,3,5-trisubstituted benzenes. During the catalysis, the ultrashort Cr-Cr quintuple bond underwent reversible cleavage/formation, corroborated by the characterization of two inverted arene sandwich dichromium complexes (μ-η6 :η6 -1,3,5-(Me3 Si)3 C6 H3 )[Cr{κ2 -HC(N-2,6-i Pr2 C6 H3 )(N-2,6-R2 C6 H3 )}]2 (R=i Pr (5), Me (8)). In the presence of σ donors, such as THF and 2,4,6-Me3 C6 H2 CN, the bridging arene 1,3,5-(Me3 Si)3 C6 H3 in 5 and 8 was extruded and 1 and 7 were regenerated. Theoretical calculations were employed to disclose the reaction pathways of these highly regioselective [2+2+2] cylcotrimerization reactions of terminal alkynes.
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Affiliation(s)
- Yu-Siang Huang
- Department of Chemistry and Frontier Research, Center on Fundamental and Applied Sciences and Matters, National Tsing Hua University, 101, Sec. 2, Guang-Fu Road, Hsinchu, 300, Taiwan
| | - Gou-Tao Huang
- Institute of Bioinformatics and Systems Biology and Department of Biological Science and Technology, National Chiao Tung University, 75 Bo-Ai Street, Hsinchu, 300, Taiwan
| | - Yao-Lun Liu
- Department of Chemistry and Frontier Research, Center on Fundamental and Applied Sciences and Matters, National Tsing Hua University, 101, Sec. 2, Guang-Fu Road, Hsinchu, 300, Taiwan
| | - Jen-Shiang K Yu
- Institute of Bioinformatics and Systems Biology and Department of Biological Science and Technology, National Chiao Tung University, 75 Bo-Ai Street, Hsinchu, 300, Taiwan
| | - Yi-Chou Tsai
- Department of Chemistry and Frontier Research, Center on Fundamental and Applied Sciences and Matters, National Tsing Hua University, 101, Sec. 2, Guang-Fu Road, Hsinchu, 300, Taiwan
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Huang YS, Huang GT, Liu YL, Yu JSK, Tsai YC. Reversible Cleavage/Formation of the Chromium-Chromium Quintuple Bond in the Highly Regioselective Alkyne Cyclotrimerization. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201709583] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yu-Siang Huang
- Department of Chemistry and Frontier Research; Center on Fundamental and Applied Sciences and Matters; National Tsing Hua University; 101, Sec. 2, Guang-Fu Road Hsinchu 300 Taiwan
| | - Gou-Tao Huang
- Institute of Bioinformatics and Systems Biology and Department of Biological Science and Technology; National Chiao Tung University; 75 Bo-Ai Street Hsinchu 300 Taiwan
| | - Yao-Lun Liu
- Department of Chemistry and Frontier Research; Center on Fundamental and Applied Sciences and Matters; National Tsing Hua University; 101, Sec. 2, Guang-Fu Road Hsinchu 300 Taiwan
| | - Jen-Shiang K. Yu
- Institute of Bioinformatics and Systems Biology and Department of Biological Science and Technology; National Chiao Tung University; 75 Bo-Ai Street Hsinchu 300 Taiwan
| | - Yi-Chou Tsai
- Department of Chemistry and Frontier Research; Center on Fundamental and Applied Sciences and Matters; National Tsing Hua University; 101, Sec. 2, Guang-Fu Road Hsinchu 300 Taiwan
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A Family of Multiply Bonded Dimolybdenum Boraamidinates with the Formal Mo−Mo Bond Orders of 3, 4, 4.5, and 5. Angew Chem Int Ed Engl 2016; 55:11614-8. [DOI: 10.1002/anie.201605543] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 07/11/2016] [Indexed: 11/07/2022]
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A Family of Multiply Bonded Dimolybdenum Boraamidinates with the Formal Mo−Mo Bond Orders of 3, 4, 4.5, and 5. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605543] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Xu L, Wei J, Zhang WX, Xi Z. Insertion/Rearrangement Reactivity of a Lutetacyclopentadiene towards N,N'-Diphenylcarbodiimide: Cooperative Effect of the Metal Center, Concentration of LiCl, and Solvent. Chemistry 2015; 21:15860-6. [PMID: 26359652 DOI: 10.1002/chem.201502135] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Indexed: 12/27/2022]
Abstract
The reactivity of lutetacyclopentadiene towards N,N'-diphenylcarbodiimide (DPC) was systematically investigated to efficiently construct three types of new N-containing fused cyclic complexes. The outcome of these reactions significantly depended on the the metal center, the concentration of LiCl, the number of equivalents of DPC, and the solvent. Thus, two unexpected reaction modes of amidinate were discovered for the first time, which were ascribed to an unusual κ(1) coordination mode of amidinate driven by a rigid seven-membered ring. These results are in striking contrast with the previously well-investigated zirconacyclopentadiene, which reacts with DPC to give azazirconacyclopentene and alkyne through β,β' CC bond cleavage. The difference in reactivity between lutetacyclopentadiene and zirconacyclopentadiene can be attributed to the highly ionic character of the LuC(sp(2) ) bonds. DFT calculations agreed well with the experimental results.
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Affiliation(s)
- Ling Xu
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871 (P.R. China), Fax: (+86) 10-62751708
| | - Junnian Wei
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871 (P.R. China), Fax: (+86) 10-62751708
| | - Wen-Xiong Zhang
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871 (P.R. China), Fax: (+86) 10-62751708. .,State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071 (P.R. China).
| | - Zhenfeng Xi
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871 (P.R. China), Fax: (+86) 10-62751708
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Lu DY, Chen PPY, Kuo TS, Tsai YC. The MoMo Quintuple Bond as a Ligand to Stabilize Transition-Metal Complexes. Angew Chem Int Ed Engl 2015; 54:9106-10. [DOI: 10.1002/anie.201504414] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Indexed: 11/09/2022]
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Lu DY, Chen PPY, Kuo TS, Tsai YC. The MoMo Quintuple Bond as a Ligand to Stabilize Transition-Metal Complexes. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504414] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Noor A, Schwarz S, Kempe R. Low-Valent Aminopyridinato Chromium Methyl Complexes via Reductive Alkylation and via Oxidative Addition of Iodomethane by a Cr–Cr Quintuple Bond. Organometallics 2015. [DOI: 10.1021/om501230g] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Awal Noor
- Lehrstuhl für Anorganische
Chemie II (Catalyst Design), Universität Bayreuth, 95440 Bayreuth, Germany
| | - Stefan Schwarz
- Lehrstuhl für Anorganische
Chemie II (Catalyst Design), Universität Bayreuth, 95440 Bayreuth, Germany
| | - Rhett Kempe
- Lehrstuhl für Anorganische
Chemie II (Catalyst Design), Universität Bayreuth, 95440 Bayreuth, Germany
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Noor A, Sobgwi Tamne E, Oelkers B, Bauer T, Demeshko S, Meyer F, Heinemann FW, Kempe R. From chromium-chromium quintuple bonds to molecular squares and porous coordination polymers. Inorg Chem 2014; 53:12283-8. [PMID: 25384210 DOI: 10.1021/ic501400n] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Reaction of the quintuply bonded chromium(I) dimer [ApCrCrAp] (Ap = sterically demanding 2-aminopyridinate) with pyrazine yields a chromium(II) complex with a η(4):η(4) face-on coordinated pyrazine dianion. Reaction with 4,4'-bipyridine, on the other hand, completely cleaves the metal-metal bond, leading to a chromium(II)-based molecular square. XRD and magnetic measurements show ligand radical anions and a ferrimagnetic alignment of alternating metal and ligand magnetic moments. Controlled polymerization of the molecular square with pyrazine yields a porous coordination polymer featuring both reduced and nonreduced linkers.
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Affiliation(s)
- Awal Noor
- Lehrstuhl Anorganische Chemie II, Universität Bayreuth , 95440 Bayreuth, Germany
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Noor A, Qayyum S, Bauer T, Schwarz S, Weber B, Kempe R. CO2and SO2activation by a Cr–Cr quintuple bond. Chem Commun (Camb) 2014; 50:13127-30. [DOI: 10.1039/c4cc05071a] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Carrasco M, Curado N, Álvarez E, Maya C, Peloso R, Poveda ML, Rodríguez A, Ruiz E, Álvarez S, Carmona E. Experimental and Theoretical Studies on Arene-Bridged Metal-Metal-Bonded Dimolybdenum Complexes. Chemistry 2014; 20:6092-102. [DOI: 10.1002/chem.201400236] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Indexed: 12/27/2022]
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