Synthesis, Crystal Structure and Electrochemical Property of New Rac-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene)bis(azido)cobalt(III) Nitrate Methanol Solvate Complex

Abstract

The new cobalt compound, [Co(C₁₆H₃₅N₁₀]⁺(NO₃)⁻·CH₃OH (1), have been synthesized and characterized. It’s structure and electrochemical property were investigated using single-crystal X-ray diffraction and cyclic voltammetry in solutions of dimethyl sulfoxide (DMSO) and methanol (CH₃OH). The X-ray diffraction analysis reveals that 1 crystallizes in the monoclinic space group P2₁/c with a = 9.8339 (10) Å, b = 16.4048 (17) Å, c = 15.3628 (16) Å, β = 104.96 (9)° and Z = 4. The complex 1 consists of one [Co(C₁₆H₃₅N₁₀)]⁺ cation, one NO₃ ⁻ anions and one solvent CH₃OH molecule. The metal center of complex 1 is six-coordinated, with the four nitrogens of the macrocycle defining an equatorial plane and two axially ligated [N₃]⁻ ions completing the cobalt coordination sphere. Moreover, hydrogen bonds of O–H⋯N, O–H⋯O and N–H⋯O and static force connect two components of the compound and maintain the crystal structure. Additionally, in situ spectro-electrochemical measurements support Co(III)/Co(II) reversible reduction processes with the observation of the corresponding spectral changes with the applied potentials E _app = −1.5 and 0.5 V. The results obtained by the method are in agreement with those by the CV methods.

Graphical Abstract

The paper is about synthesis, crystal structure and electrochemical property of a new complex.