Synthesis, structure and luminescence behaviour of bis(tridentate) Schiff base bridged dinuclear lead(II) pseudohalides

Two pentacoordinated dinuclear lead(II) compounds [Pb 2(pbap)(N 3) 4] ( 1) and [Pb 2(pbap)(NCS) 4] ( 2) [pbap = N-((1-pyridin-2-yl)benzylidene)- N′-[2-(4-{2-[((1-pyridin-2-yl)benylidene)amino]ethyl}piperazin-1-yl)ethyl]amine] are prepared and characterized using microanalytical, spectroscopic, therm...

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Bibliographic Details
Published in:Journal of molecular structure 2010-03, Vol.966 (1), p.102-106
Main Authors: Chattopadhyay, Soumi, Bhar, Kishalay, Khan, Sumitava, Mitra, Partha, Butcher, Raymond J, Ghosh, Barindra K
Format: Article
Language:English
Subjects:
Binding
Bis(tridentate) Schiff base
Diffraction
Dinuclear lead(II)
Distortion
Luminescence
Molecular structure
Pseudohalides
Schiff bases
Terminals
X-ray structures
X-rays
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Summary:Two pentacoordinated dinuclear lead(II) compounds [Pb 2(pbap)(N 3) 4] ( 1) and [Pb 2(pbap)(NCS) 4] ( 2) [pbap = N-((1-pyridin-2-yl)benzylidene)- N′-[2-(4-{2-[((1-pyridin-2-yl)benylidene)amino]ethyl}piperazin-1-yl)ethyl]amine] are prepared and characterized using microanalytical, spectroscopic, thermal and other physicochemical results. Single crystal X-ray diffraction measurements have been made to define the metal coordination spheres. Structural analyses reveal dinucleating bis(tridentate) behaviour of the hexadentate Schiff base (pbap) binding two metal ions. In the centrosymmetric dimers 1 and 2, each lead(II) center adopts a distorted square pyramidal geometry with PbN 5 chromophore ligated by each (N p, N i, N a) donor set of pbap and two N atoms of terminal pseudohalides. In DMF solutions at room temperature the complexes display high-energy intraligand 1(π–π∗) fluorescence.
ISSN:0022-2860
1872-8014
DOI:10.1016/j.molstruc.2009.12.015