Synthesis, crystal structure and spectroscopic properties of trans-dibromidobis(2,2-dimethylpropane-1,3-diamine-κ(2)N,N')chromium(III) perchlorate.
The title complex salt, trans-anti-[CrBr2(Me2tn)2]ClO4 (where Me2tn = 2,2-dimethylpropane-1,3-diamine, C5H14N2), was prepared and its structure determined by single-crystal X-ray diffraction at 100 K. The asymmetric unit contains three conformationally similar complex cations and three perchlorate anions. In each complex cation, the Cr(III) centre is coordinated by four N atoms of two chelating Me2tn ligands in the equatorial plane and by two Br atoms in a trans-axial arrangement, to give a distorted octahedral geometry. Interionic contacts are dominated by extensive hydrogen bonding, involving the NH groups of the Me2tn ligand as donors and the anion O atoms or coordinated Br atoms as acceptors, resulting in two-dimensional layers in the bc plane. Ligand field analysis based on the angular overlap model, and IR and electronic spectroscopic properties, are also discussed.
Pohang Accelerator Laboratory, POSTECH, Pohang 790-784, Republic of Korea.
Dohyun
D
Moon
Department of Chemistry, Andong National University, Andong 760-749, Republic of Korea.
Jong Ha
JH
Choi
D002857:Chromium / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D018360:Crystallography, X-Ray; D008024:Ligands; D010472:Perchlorates / Q000737:chemistry; D019265:Spectroscopy, Near-Infrared; D014961:X-Ray Diffraction
D056831:Coordination Complexes; D008024:Ligands; D010472:Perchlorates; C000600111:trans-dibromidobis(2,2-dimethylpropane-1,3-diamine-kappa(2)N,N')chromium(III) perchlorate; D002857:Chromium; C494474:perchlorate
anti conformer; bromide ligand; chromium(III) complex; crystal structure; spectroscopic properties; synchrotron radiation