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Synthesis, crystal structure and spectroscopic properties of trans ‐dibromidobis(2,2‐dimethylpropane‐1,3‐diamine‐κ 2 N,N ′)chromium(III) perchlorate
Author(s) -
Moon Dohyun,
Choi JongHa
Publication year - 2015
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229615006026
Subject(s) - perchlorate , chemistry , diamine , crystallography , ligand (biochemistry) , octahedron , chromium , crystal structure , octahedral molecular geometry , ion , hydrogen bond , ligand field theory , stereochemistry , molecule , polymer chemistry , biochemistry , receptor , organic chemistry
The title complex salt, trans ‐ anti ‐[CrBr 2 (Me 2 tn) 2 ]ClO 4 (where Me 2 tn = 2,2‐dimethylpropane‐1,3‐diamine, C 5 H 14 N 2 ), 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 Me 2 tn 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 Me 2 tn 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.