Journal of Coordination Chemistry p. 4245 - 4258 (2010)
Update date:2022-08-11
Topics:
Hosseinian, Akram
Mahjoub, Ali Reza
The synthesized ligand (DADMBTZ = 2,2'-diamino-5,5'-dimethyl-4,4'- bithiazole) is used for preparing these two new 1: 2 adducts of [Pb(DADMBTZ)2(NO3)X] X = CH3COO (1) and CLO4 (2) complexes. Characterization was done by IR, 1H-and 13C-NMR spectroscopy, elemental analysis, and single crystal X-ray determination. UV-Vis and fluorescence spectra were studied. Thermal stabilities of 1 and 2 were studied by thermal gravimetric (TG) and differential thermal analysis (DTA). The coordination number of Pb in 1 is seven (four by the chelating DADMBTZ, two oxygens of acetate and one oxygen of nitrate), whereas in 2 it is five (four by the chelating DADMBTZ and one oxygen of nitrate). Coordination geometries of 1 and 2 show a possible vacant site around Pb(II), occupied possibly by a stereoactive lone pair of electrons on lead(II); coordination around lead is hemidirected with a significant gap trans to chelating DADMBTZ, nitrate, and acetate. Both 1 and 2 make 3-D networks via N-H O and N-H N hydrogen bonds; O-H O hydrogen bonds are found in the network for 1.
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