2
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Zhao Q, Guan XT, Dou T, Cao HJ, Ma NN, Xu T, Gao PH, Kong XH, Zhang J, Chen X. Synthesis and characterization of bis(pyrazolyl)borate Ni(ii) complexes: ligand rearrangement and transformation. Dalton Trans 2019; 48:13242-13247. [PMID: 31414094 DOI: 10.1039/c9dt02287b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Five examples of bis(pyrazolyl)borate Ni(ii) complexes 2-5, exhibiting C-HNi interactions, were readily prepared from the reactions of K[BBN(3-R1-4-R2-pz)2] with Ni(ii) precursors (Ni(acac)2 or NiCl2(PPh3)2) in dichloromethane or toluene. When R1 = R2 = H, complex 2a with square-planar geometry around the Ni centre and showing an unusual C-HNi anagostic interaction was obtained. In contrast, when R1 = Me, R2 = H or R1 = Me, R2 = Br, tetrahedral complexes 3 or 4 were formed preferentially with strong C-HNi agostic interactions, respectively. Additionally, some differences in the formation and transformation of 3 and 4 were also found including a 1,2-borotropic shift during the formation of 3 and a further geometrical transformation from tetrahedral 3 to square-planar 2b by the second 1,2-borotropic shift under continuous heating; in contrast, no ligand change and further conversion were found in 4. When the more hindered 3-iPr-substituted ligand 1d was introduced in the reaction, the hydrolysis and cleavage of one B-N bond in the ligand occurred, leading to the singly hydroxo-bridged complex 5. The experimental and theoretical results indicate that the preference to form a thermodynamically stable complex and then balancing with orbital energy should be the intrinsic reason for the reaction selectivity.
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Affiliation(s)
- Qianyi Zhao
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Xin-Ting Guan
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Ting Dou
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Hou-Ji Cao
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Na-Na Ma
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Ting Xu
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Peng-Hui Gao
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Xiao-Hua Kong
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Jie Zhang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Xuenian Chen
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Normal University, Xinxiang, Henan 453007, China. and College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
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4
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Wang Y, Xie Y, Wei P, Blair SA, Cui D, Johnson MK, Schaefer HF, Robinson GH. Stable Boron Dithiolene Radicals. Angew Chem Int Ed Engl 2018; 57:7865-7868. [PMID: 29756257 DOI: 10.1002/anie.201804298] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Indexed: 11/07/2022]
Abstract
Whereas low-temperature (-78 °C) reaction of the lithium dithiolene radical 1. with boron bromide gives the dibromoboron dithiolene radical 2. , the parallel reaction of 1. with (C6 H11 )2 BCl (0 °C) affords the dicyclohexylboron dithiolene radical 3. . Radicals 2. and 3. were characterized by single-crystal X-ray diffraction, UV/Vis, and EPR spectroscopy. The nature of these radicals was also probed computationally. Under mild conditions, 3. undergoes unexpected thiourea-mediated B-C bond activation to give zwitterion 4, which may be regarded as an anionic dithiolene-modified carbene complex of the sulfenyl cation RS+ (R=cyclohexyl).
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Affiliation(s)
- Yuzhong Wang
- Department of Chemistry and the Center for Computational Chemistry, The University of Georgia, Athens, GA, 30602-2556, USA
| | - Yaoming Xie
- Department of Chemistry and the Center for Computational Chemistry, The University of Georgia, Athens, GA, 30602-2556, USA
| | - Pingrong Wei
- Department of Chemistry and the Center for Computational Chemistry, The University of Georgia, Athens, GA, 30602-2556, USA
| | - Soshawn A Blair
- Department of Chemistry and the Center for Computational Chemistry, The University of Georgia, Athens, GA, 30602-2556, USA
| | - Dongtao Cui
- Department of Chemistry and the Center for Computational Chemistry, The University of Georgia, Athens, GA, 30602-2556, USA
| | - Michael K Johnson
- Department of Chemistry and the Center for Computational Chemistry, The University of Georgia, Athens, GA, 30602-2556, USA
| | - Henry F Schaefer
- Department of Chemistry and the Center for Computational Chemistry, The University of Georgia, Athens, GA, 30602-2556, USA
| | - Gregory H Robinson
- Department of Chemistry and the Center for Computational Chemistry, The University of Georgia, Athens, GA, 30602-2556, USA
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5
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Wang Y, Xie Y, Wei P, Blair SA, Cui D, Johnson MK, Schaefer HF, Robinson GH. Stable Boron Dithiolene Radicals. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201804298] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Yuzhong Wang
- Department of Chemistry and the Center for Computational Chemistry The University of Georgia Athens GA 30602-2556 USA
| | - Yaoming Xie
- Department of Chemistry and the Center for Computational Chemistry The University of Georgia Athens GA 30602-2556 USA
| | - Pingrong Wei
- Department of Chemistry and the Center for Computational Chemistry The University of Georgia Athens GA 30602-2556 USA
| | - Soshawn A. Blair
- Department of Chemistry and the Center for Computational Chemistry The University of Georgia Athens GA 30602-2556 USA
| | - Dongtao Cui
- Department of Chemistry and the Center for Computational Chemistry The University of Georgia Athens GA 30602-2556 USA
| | - Michael K. Johnson
- Department of Chemistry and the Center for Computational Chemistry The University of Georgia Athens GA 30602-2556 USA
| | - Henry F. Schaefer
- Department of Chemistry and the Center for Computational Chemistry The University of Georgia Athens GA 30602-2556 USA
| | - Gregory H. Robinson
- Department of Chemistry and the Center for Computational Chemistry The University of Georgia Athens GA 30602-2556 USA
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6
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Bloomfield AJ, Matula AJ, Mercado BQ, Batista VS, Crabtree RH. Organometallic Iridium Complex Containing a Dianionic, Tridentate, Mixed Organic–Inorganic Ligand. Inorg Chem 2016; 55:8121-9. [DOI: 10.1021/acs.inorgchem.6b01218] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Aaron J. Bloomfield
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Adam J. Matula
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Brandon Q. Mercado
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Victor S. Batista
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Robert H. Crabtree
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
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Pettinari R, Marchetti F, Pettinari C, Condello F, Petrini A, Scopelliti R, Riedel T, Dyson PJ. Organometallic rhodium(III) and iridium(III) cyclopentadienyl complexes with curcumin and bisdemethoxycurcumin co-ligands. Dalton Trans 2015; 44:20523-31. [PMID: 26548708 DOI: 10.1039/c5dt03037d] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A series of half-sandwich cyclopentadienyl rhodium(III) and iridium(III) complexes of the type [Cp*M(curc/bdcurc)Cl] and [Cp*M(curc/bdcurc)(PTA)][SO3CF3], in which Cp* = pentamethylcyclopentadienyl, curcH = curcumin and bdcurcH = bisdemethoxycurcumin as O^O-chelating ligands, and PTA = 1,3,5-triaza-7-phosphaadamantane, is described. The X-ray crystal structures of three of the complexes, i.e. [Cp*Rh(curc)(PTA)][SO3CF3] (5), [Cp*Rh(bdcurc)(PTA)][SO3CF3] (6) and [Cp*Ir(bdcurc)(PTA)][SO3CF3] (8), confirm the expected "piano-stool" geometry. With the exception of 5, the complexes are stable under pseudo-physiological conditions and are moderately cytotoxic to human ovarian carcinoma (A2780 and A2780cisR) cells and also to non-tumorigenic human embryonic kidney (HEK293) cells, but lack the cancer cell selectivity observed for related arene ruthenium(II) complexes.
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Affiliation(s)
- Riccardo Pettinari
- School of Pharmacy, University of Camerino, via S. Agostino 1, 62032 Camerino MC, Italy.
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