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Title: Syntheses, structures and properties of cadmium(II) halide complexes containing tridentate Schiff bases
Authors: Kundu, Subhasish
Roy, Subhasis
Bhar, Kishalay
Sutradhar, Dipu
Mitra, Partha
Ghosh, Barindra Kumar
Keywords: Coordination chemistry;Cadmium(II);Schiff bases;Halides;Crystal structures;Luminescence
Issue Date: 7-Nov-2013
Abstract: Three neutral mononuclear complexes of the type [Cd(L1)I2] (1) [L1 = (N,N-diethyl,N'-(pyridin-2-yl)formylidene)ethane-1,2-diamine] and [Cd(L2)X2] [L2 = (N,N-diethyl,N'-(pyridin-2-yl)benzylidene)ethane-1,2-diamine; X = Br­- (2), I- (3)] are isolated using one-pot reactions of cadmium(II) halides and tridentate Schiff bases (L1 and L2) in a 1:1 molar ratio in MeOH solutions at room temperature. The compounds are characterized by elemental analyses and spectroscopic and other physicochemical data. Single-crystal X-ray diffraction analyses of (1)-(3) show that cadmium(II) center in each complex adopts a distorted square pyramidal geometry bound by three N atoms of L1/L2 and two terminal halides. Intermolecular π…π interactions in (1), cooperative C-H…Br hydrogen bonds and C-H…π interactions in (2) and C-H…π interactions in (3) lead to different crystalline architectures. Thermogravimetric analyses show that the compounds have reasonable thermal stabilities. The complexes display ligand-centered π–π* fluorescence in DMF solutions at room temperature.
Page(s): 1404-1410
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.52A(11) [November 2013]

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