title: Synthesis, conformational structure and spectroscopic properties of trans-diazidobis(2,2-dimethyl-1,3-propanediamine)chromium(III) perchlorate.
abstract: A new complex trans-anti-[Cr(Me2tn)2(N3)2]ClO4·2H2O, where Me2tn=2,2-dimethyl-1,3-propanediamine was synthesized and characterized, and its molecular structure was established by single-crystal X-ray diffraction at 95K. 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)Å, and β=99.07 (3)°. The chromium(III) atom was in a distorted octahedral coordination with four N atoms of two chelating Me2tn 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 CrN(azide) 2.007 (2), CrN(Me2tn) 2.081 (2), 2.082 (2), NN(azide) 1.184 (2) and 1.156 (2)Å, respectively. The crystal lattice is stabilized by hydrogen bonding interactions among the ClO4(-), hydrate molecule, N3(-), and NH groups of the Me2tn ligand. The ligand field analysis as well as the IR and electronic spectral properties were described.
authors.affiliation: Pohang Accelerator Laboratory, POSTECH, Pohang 790-784, South Korea.
authors.forename: Dohyun
authors.initials: D
authors.lastname: Moon
authors.affiliation: Department of Chemistry, Andong National University, Andong 760-749, South Korea. Electronic address: jhchoi@anu.ac.kr.
authors.forename: Jong-Ha
authors.initials: JH
authors.lastname: Choi
mesh_terms: D001386:Azides / Q000138:chemical synthesis* / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry*; D018360:Crystallography, X-Ray; D003959:Diamines / Q000138:chemical synthesis* / Q000737:chemistry*; D004583:Electrons; D006860:Hydrogen Bonding; D008024:Ligands; D008968:Molecular Conformation; D010472:Perchlorates / Q000138:chemical synthesis* / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013816:Thermodynamics
chemical_list: D001386:Azides; D056831:Coordination Complexes; D003959:Diamines; D008024:Ligands; D010472:Perchlorates; C494474:perchlorate
keywords: Chromium(III) complex; Crystal structure; N(3)(−) coordination mode; Spectral properties; anti-Conformer