title: Structure, photochemistry and magnetic properties of tetrahydrogenated Schiff base chromium(III) complexes.
abstract: Four mononuclear chromium(III) complexes [Cr(L(1))(en)]Br0.3Cl0.7 (1), [Cr(L(1))(pr)]Cl (2), [Cr(L(2))(en)]ClO4 (3), [Cr(L(2))(pr)]Cl (4) along with one dinuclear μ-methoxo [Cr(μ-OMe)(L1)]2 (5) were synthesized (en=1,2-ethanediamine, pr=1,3-diaminopropane H2L(1)=Tetrahydrosalen=H2[H4]salen=N,N'-bis(2-hydroxybenzyl)-1,2-ethanediamine, H2L(2)=Tetrahydrosalpr=H2[H4]salpr=N,N'-bis(2-hydroxybenzyl)-1,3-diaminopropane). The competitive reactions in the presence of EDTA were carried out and the first-order rate constants k(1)=(5.2±0.2)×10(-3) h(-1)<k(2)=(6.7±0.3)×10(-3) h(-1)<k(3)=(8.0±0.1)×10(-3) h(-1)<k(4)=(9.5±0.2)×10(-3) h(-1) were obtained by spectroscopic measurements. In addition, photo-induced decomposition was monitored under irradiation of xenon lamp. The sequence of first-order rate constants is k'(1)=(4±0.1)×10(-4) s(-1)<k'(2)=(6±0.3)×10(-4) s(-1)<k'(3)=(1.1±0.2)×10(-3) s(-1)<k'(4)=(1.4±0.2)×10(-3) s(-1), which is in accordance with that of kinetics studies with EDTA. Dinuclear complex 5 exhibits a strong antiferromagnetic coupling with the J=-10.8 cm(-1).
authors: Institute of Molecular Science, Key Laboratory of Chemical Biology of Molecular Engineering of Education Ministry, Shanxi University, Taiyuan 030006, China. Electronic address: liubin@sxu.edu.cn.
authors: Bin
authors: B
authors: Liu
authors: Institute of Molecular Science, Key Laboratory of Chemical Biology of Molecular Engineering of Education Ministry, Shanxi University, Taiyuan 030006, China.
authors: Jie
authors: J
authors: Chai
authors: Institute of Molecular Science, Key Laboratory of Chemical Biology of Molecular Engineering of Education Ministry, Shanxi University, Taiyuan 030006, China.
authors: SiSi
authors: S
authors: Feng
authors: Institute of Molecular Science, Key Laboratory of Chemical Biology of Molecular Engineering of Education Ministry, Shanxi University, Taiyuan 030006, China. Electronic address: yangbs@sxu.edu.cn.
authors: BinSheng
authors: B
authors: Yang
mesh_terms: D002857:Chromium / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D018360:Crystallography, X-Ray; D003959:Diamines / Q000737:chemistry; D005029:Ethylenediamines / Q000737:chemistry; D060328:Magnetic Phenomena; D008958:Models, Molecular; D012545:Schiff Bases / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D056831:Coordination Complexes; D003959:Diamines; D005029:Ethylenediamines; D012545:Schiff Bases; D002857:Chromium; C031234:ethylenediamine; C011452:disalicylaldehyde ethylenediamine; C009475:trimethylenediamine
keywords: Chelate effect; Chromium(III); Kinetics; Magnetism; Photochemistry; Tetrahydrogenated Schiff base