Synthesis, conformational structure and spectroscopic properties of trans-diazidobis(2,2-dimethyl-1,3-propanediamine)chromium(III) perchlorate

A new complex trans-anti-[Cr(Me(2)tn)(2)(N-3)(2)]ClO4 center dot 2H(2)O, where Me(2)tn = 2,2-dimethyl-1,3-propanediamine was synthesized and characterized, and its molecular structure was established by single-crystal X-ray diffraction at 95 K. The complex crystallized in the space group C2/c of the monoclinic system with four mononuclear formula units in a cell of dimensions a = 16.600 (3), b = 7.709 (2), c = 16.865 (3)angstrom, and beta = 99.07 (3)degrees. The chromium(III) atom was in a distorted octahedral coordination with four N atoms of two chelating Me(2)tn ligands and two N atoms of the azido group in the trans axial position. The two six-membered rings in the complex adopted only anti chair-chair conformations with respect to each other The important bond lengths are Cr-N(azide) 2.007 (2), Cr-N(Me(2)tn) 2.081 (2), 2.082 (2), N-N(azide) 1.184 (2) and 1.156 (2) angstrom, respectively. The crystal lattice is stabilized by hydrogen bonding interactions among the ClO4-, hydrate molecule, N-3(-), and NH groups of the Me(2)tn ligand. The ligand field analysis as well as the IR and electronic spectral properties were described. (C) 2014 Elsevier B.V. All rights reserved.