A new one-dimensional coordination polymer [(N2H5)2Co(HPO4)2] was synthesized by slow evaporation method and characterized by means of single-crystal X-ray diffraction, Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA). Its catalytic activity was tested using UV-visible absorption measurements. The compound crystallizes in the monoclinic system (S.G: P21/c) with the cell parameters (Å, °): a= 5.3665(3), b= 11.1271(6), c= 7.7017(4), β= 104.843(4), V= 444.55(4) Å 3 and Z= 2. The crystal structure, consisting of a linear chain, is made of rings of [CoN2O4] octahedra and [PO3(OH)] tetrahedra sharing vertices via oxygen atoms coordinated to cobalt centers. The rings are linked to chains running along [100] and form thereby polymeric chains that are connected by hydrogen bonds in a three-dimensional arrangement. The FTIR spectroscopy shows the expected bands of hydrazine and phosphate groups. The thermal behavior consists mainly of the loss of hydrazine moieties leading thus to the formation of anhydrous cobalt phosphate. The phosphate complex exhibits efficiency in catalytic oxidation and degradation of methylene blue dye. The ac magnetic susceptibility shows a peak indicating antiferromagnetic order with a Neel temperature of 5.5 K. Fitting the Curie-Weiss equation to the ac magnetic susceptibility above 50 K gives the average Curie-Weiss Constant to be -11.8 K.

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A new metal pyrophosphate, formulated as [(H 2 O) 2 Co 2 (N 2 H 5 ) 2 (HP 2 O 7 ) 2 ] has been synthesized using wet chemistry and investigated by single crystal X-ray diffraction. The compound crystallizes in the triclinic system (S.G: P ) with the following parameters (Å, °): a = 7.2957( 6), b = 7.3932(4), c = 14.7194(8), α = 85.717(4), β = 83.703(6), γ = 79.710(5). The crystal packing consists of layers parallel to bc plane. These layers are joined by strong hydrogen bonds, building up a three-dimensional infinite network. The structural analysis was coupled with Hirshfeld surface analysis to evaluate the contribution of the different intermolecular interactions to the formation of supramolecular assemblies in the solid state. This analysis revels that the main contributions are provided by the O•••H, H•••H and Co•••O interactions that represent ~85% of the total contributions to the Hirshfeld surface. Pyrophosphate group show bent eclipsed conformation which was confirmed by IR spectroscopy. Its Thermal behaviour consists mainly of the loss of hydrazine moieties and water molecules leading thus to the formation of an anhydrous cobalt diphosphate. The condensed phosphate exhibits a promising catalytic activity in the oxidation and decomposition of methylene blue dye with hydrogen peroxide under ambient conditions only for 2 hours. Figure 1: Polyhedral presentation of [(H 2 O) 2 Co 2 (N 2 H 5 )(HP 2 O 7 ) 2 ] layer along [100] direction