Synthesis,crystal structure determination,and spectroscopic characterization of [2,13-dibenzyl-5,16-diethyl-2,6,13,17-tetraazatricyclo(16.4.0.0 7,12 )docosane] copper(II) dinitrate

Abstract

A novel metal complex, [Cu(L^b)](NO₃)₂ [L^b = 2,13-dibenzyl-5,16-diethyl-2,6,13,17-tetraazatricyclo(16.4.0.0^7,12)docosane], was synthesized and characterized by single-crystal X-ray diffraction as well as other spectroscopic techniques. Structural analysis revealed that the copper(II) ion has an approximately square planar arrangement with stable trans-III configuration of the macrocyclic ligand. The Cu–N(tertiary) distance (2.0860 (14) Å) is greater than the Cu–N(secondary) distance (2.0229 (15) Å), which may be attributed to the steric effect of the benzyl group attached to the tertiary N atom. The nitrate anion and complex cation are linked by hydrogen bonds and weak Cu···O interactions. The metal complex showed strong blue luminescence when excited in the 355-391 nm region, and both blue as well as green emissions when excited in the 438–460 nm range.

Keywords

Crystal structure macrocyclic Cu(II) complex molecular spectroscopy

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