Two novel binuclear Mn(II) metal-organic coordination complexes [Mn 2 (TBZ) 2 (CDC)(C 2 O 4 )] n (1), {[Mn 2 (TBZ) 2 (BDC) 0.5 (BTC)(H 2 O) 2 ]·ET} n (2), (where TBZ = thiabendazole, H 2 CDC = trans-1,4-cyclohexanedicarboxylic acid, H 2 C 2 O 4 = oxalic acid, H 3 BTC = 1,3,5-benzenetricarboxylic acid, ET = ethanol, H 2 BDC = 1,4-benzenedicarboxylate) have been hydrothermally synthesized and characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, electrochemical analysis and single crystal X-ray diffraction. The X-ray structure analysis reveals that 1 is s two-dimensional layer and 2 is s one-dimensional chain. In complex 1, it reveals 2-D layers composed of multi-(bidentate) bridging ligands (CDC and C 2 O 4 ), and in 2, the coordinated BTC ligands adopt a monodentate mode and with BDC ligands adopt alternately chelating Mn1 and Mn2 bridges into 1-D chains. The 3-D structures of the two complexes are stabilized by π-π stacking interactions and hydrogen bonds.

= 3-nitro-1,2-benzenedicarboxylic acid, 2,2 -bpy = 2,2 -bipyridine, 4,4 -bpy = 4,4 -bipyridine), have been synthesized and structurally characterized. Complex 1 is a 0-dimensional (0D) framework, but face-to-face π -π stacking interactions and O-H···O hydrogen bonds extend these molecules into a 3D supramolecular framework. X-ray structure analysis reveals that complexes 2 exhibit a 2-dimensional (2D) network structure. Also, IR spectra, fluorescence properties, thermal decomposition process, and powder X-ray diffraction of the complexes were investigated.Keywords 3-nitro-1, 2-benzenedicarboxylic acid, carboxylate group, X-ray crystal diffraction INTRODUCTIONOver the past two decades, the crystal engineering of coordination complexes (CCs) has provoked unparalleled attention and imagination within coordination chemistry based on assembly of judiciously chosen metal ions (joints) and multifunctional organic ligands (struts). Much effort has been devoted to controlling the structures of CCs because their intriguing properties and potential applications are strongly dependent on their structures. [1] Despite some recent advancement, the ability to predict and control the supramolecular assembly remains a longstanding challenge, and much more elaborate and systematic work is required to comprehend the inter-and intramolecular forces that determine the fashions of molecular structure and crystal packing in the solid state. A better understanding of the influence factors of structure, including inbeing of the metal ions and the predesigned organic ligands [2] as well as other factors such as the medium, [3] the pH value of the solution, [4] the temperature, [5]

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A novel lanthanum cadmium complex [LaCd(bpy) 4 (NO 3 ) 5 ] (where bpy = 2,2 -Bipyridine) has been synthesized and structurally characterized by X-ray diffraction method, elemental analysis, spectral method (IR), powder X-ray diffraction (XRD), electronic spectra (UV-vis) and photoluminescence properties. The complex crystallizes in the monoclinic space group P21/c with unit cell parameters a = 16.883(2) Å, b = 14.382(2) Å, c = 18.981(3) Å, β = 96.806(2), V = 4576.5(11) Å 3 , and Z = 4. The complex is completed by two crystallographically and chemically independent, octahedrally coordinated Cd(II) ion and icosahedronly coordinated La(III) ion. The electronic spectra and photoluminescence of the complex has been described.