Synthesis, crystal structure and luminescence properties of “paddle wheel” and “butterfly” shaped polynuclear complexes

Abstract

A series of metal cluster-based complexes was constructed from the reaction of metal ions (Fe III , Cu II , Zn II ) and ligand (2-({2-[2-carbosybenzoy])oxy]-ethoxy}carbonyal)benzoic acid) (H 2 L) in CH 3 CH 2 OH, CH 3 OH, (C 2 H 5 ) 3 N and IntroductionNovel coordination polyhedrons have received much attention due to their great potential applications[1], such as catalysis[2], magnetism[3], luminescence[4] and gas storage[5]. One promising approach for the construction of coordination polyhedrons is based on the self-assembly of cluster-based complex composed of polynuclear cluster as secondary building unit (SBU) and bridging organic linkers[6]. Usually, linear dicarboxylic acids as linkers may be used to assembly transition-metal ions into polynuclear clusters through a network of bridges[7]. The modification on

Cobalt(II) Paddle-Wheel Complex with 3,5-Di(tert-butyl)-4-hydroxybenzoate Bridges: DFT and ab initio Calculations, Magnetic Dilution, and Magnetic Properties

“….M by 0.151 Å causes displacement of the zinc atom closer to the geometrical center of the square pyramid (by 0.076 Å) and is partially compensated by the proximity of the oxygen atom of the ethanol molecule (by 0.049 Å). This change in the geometry of the coordination environment can be expressed by the square pyramid distortion criterion defined by the Continuous Shape Measures approach: S Q (1) = 0.465 and S Q (2) = 0.326.The observed M-O and C-O bond lengths agree well with the known data for dimeric Co and Zn complexes of similar structures[31][32][33][34].…”