Abstract

ne-pot reaction of Zn(II) acetate dihydrate, pyridine, and potassium thiocyanate in a 1:1:2 M ratio in methanol
solution at room temperature result in neutral white mononuclear complex crystal 1 of the type [Zn(L)2(μ1,1-NCS)2].
[L=Pyridine]. Single crystal X-ray diffraction was ambiguously used to confirm the complex 1 structure.
Complex 1 has been characterized by different well-known physicochemical techniques, Fourier transform
infrared spectra, UV-Vis spectroscopic study, and common elemental analyses (carbon, hydrogen and nitrogen).
Molar conductivity study directly indicates Complex 1 is nonelectrolyte. Complex 1 crystallizes in monoclinic
system, space group P 2(1)/m, with the values a=5.567(5), b=11.085(5), and c=12.132(5) Å; α=90.000°(5),
β=96.725°(5), and γ=90.000°(5); Ѵ=743.5Å3 and Z=4. X-ray structural study reveals that in complex 1
environment of Zn(II) metal ion has perfect tetrahedral coordination sphere, where Zn(II) metal is tetrahedrally
coordinated to the nitrogen donor atoms of two pyridine ligands and the two N-bonded SCN−1 ions showing
awesome binding fashion (μ1,1-NCS) of thiocyanato pseudohalide template. The crystal lattice stabilization is
not maintained by any kinds of hydrogen bonding and hence π-π interactions never lead to supramolecular
architectures in the crystal system. The synthesized Zn(II) complex 1 has been screened for antibacterial activity
against some important Gram-negative and Gram-positive bacteria such as Escherichia coli, Bacillus subtilis,
and Candida albicans. Complex 1 exhibits enhanced antibacterial activity in comparison to free pyridine ligand.
Apart from, complex 1 is fluorescence silent with respect to pyridine coligand.