Two novel coordination
compounds of cadmium, [Cd2L1(ssal)2(H2O)3]2·10H2O (1) and {[Cd2L1(dca)4(H2O)]·H2O}
n
(2) (where L1 =
2,2′,2″-(1-(pyridin-2-ylmethyl)imidazolidine-2,4,5-triyltripyridine),
ssal = sulfosalicylate, and dca = dicyanamide), have been synthesized
under reflux conditions. The nitrogen-rich ligand L1 was
formed in situ by Cd(II)-mediated coupling cycloaddition of the Schiff
base N-(2-pyridylmethyl)pyridine-2-carbaldimine:
thus, through a Cd(II)-catalyzed reaction. In the two species sulfosalicylate
or dicyanamide anions act as a coligand. The single-crystal X-ray
structural analyses revealed that 1 is a discrete centrosymmetric
tetranuclear complex crystallizing with 10 lattice water molecules
that favor the formation of a 3D supramolecular structure through
H bonds. On the other hand complex 2 is a coordination
polymer built by bridging dca anions connecting −[Cd1(L1)Cd2]– building blocks. The polymers are further connected
by H bonds involving the coordinated and lattice water molecules with
terminal dca N atoms of symmetry-related chains. The luminescent properties
of complexes 1 and 2 were investigated in
various organic solvents, and both complexes show a highly selective
sensitive response toward nitroaromatic compounds, especially toward
picric acid (PA). The possible quenching mechanism of the process
has been validated by the combined effect of energy and electron transfer
mechanisms as well as electrostatic interactions.
Tetra/tri nuclear Ni(II) complexes namely[Ni4(L)4(H2O)4].5(dmf).7(H2O) (1) and [Ni3(L)2(bz)2(dmf)2(H2O)2] (2) [H2L = N-(2-(hydroxy)-3-methoxybenzylidene)tryptophan); dmf = dimethyl formamide, bz = benzoate anion] have been synthesized and characterized by X-ray single crystal structure...
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