Crystal structures, magnetic properties and DFT study of cobalt(II) azido complexes with the condensation product of 2-quinolinecarboxaldehyde and Girard’s T reagent
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Add time:09/09/2019 Source:sciencedirect.com
A tridentate NNO condensation product of 2-quinolinecarboxaldehyde and Girard’s T reagent (HLCl) in the presence of azide ions coordinates with cobalt(II) giving mononuclear azido Co(II) complex [CoHL(N3)3] (1) as a main product and dinuclear end-on azido bridged Co(II) complex [Co2L2(μ-1,1-N3)2(N3)2] (2) in traces. Crystal structures of both complexes were determined. Variable temperature magnetic susceptibility measurement studies of complex 1 showed that Co(II) cation is in the low-spin state with t2g6eg1 (S = 1/2) configuration. DFT-BS calculations for complex 2 anticipated ferromagnetic type interaction between paramagnetic centers (J = 53 cm−1).
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