期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 133, 期 46, 页码 18785-18801出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja206042k
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资金
- Max-Planck-Gesellshaft
- NSF [CHE-0841786]
- Royal Commission
- Cornell University
- Department of Energy, Office of Basic Energy Sciences
- National Institutes of Health [P41RR001209]
- National Center for Research Resources
- U.S. Department of Energy, Office of Biological Environmental Research
- Direct For Mathematical & Physical Scien [0841786] Funding Source: National Science Foundation
- Division Of Chemistry [0841786] Funding Source: National Science Foundation
Multiple spectroscopic and computational methods were used to characterize the ground-state electronic structure of the novel {CoNO}(9) species Tp*Co(NO) (Tp* = hydro-tris (3,5-Me-2-pyrazolyl)borate). The metric parameters about the metal center and the pre-edge region of the Co K-edge X-ray absorption spectrum were reproduced by density functional theory (DFT), providing a qualitative description of the Co-NO bonding interaction as a Co(II) (S-Co = 3/2) metal center, antiferromagnetically coupled to a triplet NO- anion (S-NO = 1), an interpretation of the electronic structure that was validated by ab initio multireference methods (CASSCF/MRCI). Electron paramagnetic resonance (EPR) spectroscopy revealed significant g-anisotropy in the S = 1/2, ground state, but the linear-response DFT performed poorly at calculating the g-values. Instead, CASSCF/MRCI computational studies in conjunction with quasi-degenerate perturbation theory with respect to spin orbit coupling were required for obtaining accurate modeling of the molecular g-tensor. The computational portion of this work was extended to the diamagnetic Ni analogue of the Co complex, Tp*Ni(NO), which was found to consist of a Ni(II) (S-Ni = 1) metal center antiferromagnetically coupled to an S-NO = 1 NO-. The similarity between the Co and Ni complexes contrasts with the previously studied Cu analogues, for which a Cu(I) bound to NO0 formulation has been described. This discrepancy will be discussed along with a comparison of the DFT and ab initio computational methods for their ability to predict various spectroscopic
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