Syntheses, structural characterizations, and electrochemical and fluorescent properties of homo ‐ and hetero‐polynuclear transition metal(II) complexes

Rare homo ‐ and hetero‐polynuclear transition metal(II) complexes, [{Cu(L1)}2] (1) and [Cu(L2)Ni2(CH3OH)2] (2), were prepared and characterized. Complex1 possesses an uncommon dinuclear structure bonded by two alkoxy bridges. Complex2 exhibits an unexpected trinuclear heterobimetallic structure from two chelating (L2)3 − units in crossover mode. Fluorescence behaviors of1 and2 were investigated, and electrochemical experiments revealed that electrolytic redox reactions of1 are irreversible processes. Rare homo ‐ and hetero‐polynuclear transition metal(II) complexes, [{Cu(L1)}2] (1) and [Cu(L2)Ni2(CH3OH)2] (2), were prepared and structurally characterized. Complex1 possesses an uncommon dinuclear structure bonded by two alkoxy bridges, and all the Cu(II) atoms are tetra ‐coordinated with slightly distorted square planar geometries. The Cu1─Cu2 bond distance is 2.994(3) Å. Complex2 exhibits an unexpected trinuclear heterobimetallic structure from two chelating (L2)3 − units in crossover mode, which is the first heterobimetallic 3d –3d salamo‐type transition metal complex. The two Ni(II) atoms are penta‐coordinated with slightly distorted square pyramidal geometries (τ = 0.269 (Ni1) and 0.498 (Ni2)), and the Cu(II) atom is tetra‐coordinated with a slightly distorted square planar geometry. Moreover, fluorescence behaviors of1 and2 were investigated, and electrochemical study reveals that the electrolytic redox reactions of1 are irreversible processes...

Source: Applied Organometallic Chemistry - October 18, 2018 Category: Chemistry Authors: Zong ‐Li Ren, Xiao‐Yan Li, Jing Hao, Yang Zhang, Wen‐Kui Dong Tags: FULL PAPER Source Type: research