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|Title:||Tetrameric zirconium(IV) complexes with bidentate ligands|
|Authors:||Mishra, P K|
Dash, K C
|Abstract:||Oxozirconium(IV) chloride reacts with several heterocyclic bidentate ligands, 2,2'-bipyridyl (Bipy), 1,10-phenanthroline (Phen), 2-(2'-pyridyl) benzimidazole (PBH), 3,5-dimethyl-1 (2'-pyridyl) pyrazole (DMPP) and bidentate schiff bases obtained by condensing salicylaldehyde with aromatic amines, to form tetrameric complexes where the four zirconium atoms are connected in a ring by four pairs of hydroxy bridges. Each Zr atom has eight-coordinated dodecahedral structure as is the case with the parent compound ZrOCl2. The compounds are formulated as [Zr4(OH)8(H2O)8(L)4]X8 (L=bidentate ligand) and [Zr4(OH)8(H2O)14 (DMPP)]X8 (X=Cl, NCS). The analytical data, conductance, IR, Raman and NMR spectra and the thermogravimetric measurements characterise the complexes. The thermogravimetric measurements show that the complexes lose H2O followed by ligands finally forming ZrO2 as the end product.|
|Appears in Collections:||IJC-A Vol.28A(07) [July 1989]|
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