Zenkina OV, Konstantinovski LE, Shimon LJW, Diskin-Posner Y, Iron MA, van der Boom ME. Long-range through-bond heteronuclear communication in platinum complexes.
Inorg Chem 2009;
48:4021-30. [PMID:
19338319 DOI:
10.1021/ic801940h]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Four analogous platinum stilbene- and stilbazole-based complexes exhibit unusual long-range heteronuclear spin-spin coupling in solution. Single crystal analysis and NMR experiments show that the (19)F, (31)P, and (195)Pt nuclei communicate over large distances (0.9-1.3 nm) through bond rather than through space. Spin-spin couplings between (195)Pt and (19)F over seven bonds and between (31)P and (19)F over eight bonds are observed with (7)J(PtF) = 2.9 Hz and (8)J(PF) = 11.8 Hz. Remarkably, a very large spin coupling between (195)Pt and (19)F over six bonds ((6)J(PtF) = 40.1 Hz) is also observed in a structurally related pyridinium complex. Experimental and gNMR (version 5.0) simulated (19)F{(1)H}, (31)P{(1)H}, and (195)Pt{(1)H} spectra of the complexes reveal a three-spin AMY system (A = (31)P, M = (31)P, Y = (19)F) or a five-spin AMY(3) flanked by a four-spin AMXY or a six-spin AMXY(3) system (X = (195)Pt), respectively. Density functional theory calculations at the PBE0/SDD level of theory show a pi-conjugated metal-ligand network, which may contribute to the experimentally observed spin-spin interactions.
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