Synthesis and characterization of chromium and tungsten tetracarbonyl bound to the bridging ligand 2,3-bis(2-pyridyl)pyrazine (dpp)
作者： R.R. Ruminski , I. Wallace
DOI: 10.1016/S0277-5387(00)80769-X
关键词: Nuclear magnetic resonance spectroscopy 、 Inorganic chemistry 、 Ligand 、 Crystallography 、 Pyrazine 、 Pi backbonding 、 Bridging ligand 、 Chemistry 、 Excited state 、 Ligand field theory 、 Solvatochromism
摘要: The synthesis, electronic absorption, infrared and 13C NMR spectra, electrochemistry of [Cr(CO)4]dpp [W(CO)4]dpp (dpp = 2,3-bis(2-pyridyl)pyrazine) are reported. Electronic absorption spectra in different solvents show solvatochromic behavior indicate the metal to ligand charge transfer (MLCT) excited state is lower energy than field (LF) state. Electrochemical results complex undergoes semi-reversible one electron oxidation, while irreversible oxidation. both complexes all carbons metal-bound dpp ring shift downfield. amount downfield for series [M(CO)4]dpp (M Cr, Mo, W) interpreted as indicating better M dπ → pπ backbonding occurs Mo W Cr.
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