.1,3,4 - To Thiadiazole Yl-2 ,5 - Dicarboxylic Acid Metal Complexes Synthesis, Crystal Structure And Its Performance Study

Thiadiazole derivatives have attracted extensive attention due to the forefront research in the areas of poly material, preventing bacterial infection, selective catalysts and so on. In this paper, we synthesized a new ligand 2,5-(s-acetic acid) dimercapto-1,3,4 thiadiazole(H₂ADTZ) and characterized by IR, elementary analysis, C¹³NMR. Then prepared its corresponding complex M(ADTZ)·4H₂O(M=Co, Ni, Mn, Zn), Y (ADTZ)_1.5·6H₂O. 1.5H₂O, M₂ (ADTZ)₃·5H₂O(M=Pr, Nd, Eu, Er),The crystal structures of the complex was characterized by X-ray diffraction.(1)M (ADTZ)·4H₂O (M=Co(â…¡) (1) ,Ni(â…¡) (2), Mn(â…¡) (3) ,Zn(â…¡)(4)) The molecules(1),(2),(4) crystallize in the space group P2₁ and the complex of Mn (ADTZ)·4H₂O crystallizes in the space groupP2c, however, the others all belongs to monoclinic. There are similar one-dimension chains exist in the four compounds which are two-dimensional supramolecule expanded by intramolecular hydrogen bonds and intermolecular bonds. The metal ions situate in a slightly distorted octahedron. We investigated the electro-chemical properties of the complexes of M (ADTZ)·4H₂O (M=Co(â…¡) (1) Ni(â…¡) (2) Mn(â…¡) (3)) and obtained the nanoZnO under proper condition, and then characterized by XRD and TEM.(2) Y (ADTZ)_1.5·6H)2O. 1.5H₂O crystallizes in the monoclinic, space group C2c with a=46.114(9)A, b=5.8837(12)A, c=16.680(3)A, Z=8. the center metal ion coordinated to eight oxygen atoms. H₂ADTZ act as bidentate which expand the complex into two-dimension structure unit, the complex show three-dimension structure joined by intramolecular hydrogen bonds and intermolecular bonds, the thiadiazole ring must be distorted to satisfy the requirement of its symmetry in crystallography.(3) M₂(ADTZ)₃ · 5H₂O(M=Pr (â…¢), Nd (â…¢), Eu (â…¢), Er (â…¢) ) crystallizein the triclinic, space group P 1 , there are two isolated metal atoms exit in thethree-dimension polymers in crystallographic. In the complexes of M₂(ADTZ)₃ · 5H₂O(M=Pr, Nd, Eu) , the two metal atoms are both nine-coordinated, however,Er2(ADTZ)3 ? 5H2O has a little difference from above compounds, Eri is also nine-coordinated, but Er2 adopted eight-coordinated pattern. The change of dentate mode may resulted from lanthanide contraction which enhance the sterical hinder thus reduce the number of dentate. The three-dimension polymers are expanded by the interlude of two-dimension plane which formed by the bridging mode of carboxyl via Ml and one-dimension chain which formed by the chelate function of carboxyl via M2 .