Synthesis, crystal structures and fluorescence properties of two new di- and polynuclear Cd(II) complexes with N2O donor set of a tridentate Schiff base ligand

Two new Cd(II) complexes, having one binuclear structure [Cd2(L)2(Cl)2] (1) and another azido bridged one-dimensional zig-zag polynuclear network [Cd3(μ1,1-N3)4(L)2{H2N(CH2)2N(C2H5)2} · H2O]n (2) have been synthesized from a tridentate N2O donor Schiff base ligand LH, [LH = (OCH3)(OH)C6H3CHN(CH2)2N(C2H5)2], which is the condensation product of 2-hydroxy-4-methoxybenzaldehyde and 2-diethylaminoethylamine. Both the complexes 1 and 2 have been characterized by elemental analyses, IR & 1H NMR spectroscopy, TGA and fluorescence studies. Finally their structures have been established by single crystal X-ray diffraction method. Structural study reveals that in the complex 1, two Cd(II) centers are held together by two μ2-phenolato oxygen atoms and the terminal chlorine atom occupies the apical site of the square pyramidal environment of each metal center. In case of complex 2, the trinuclear asymmetric unit contains octahedral Cd(II) centers which are further held together by doubly end-on azido bridging to form a zig-zag polynuclear structure. It also displays intraligand 1(π–π∗) fluorescence and can potentially serve as photoactive material.

Two new di- and polynuclear Cd(II) complexes [Cd2(L)2(Cl)2] (1) and [Cd3(μ1,1-N3)4(L)2{H2N(CH2)2N(C2H5)2} · H2O]n (2) of the Schiff base ligand LH [LH = (OCH3)(OH)C6H3CHN(CH2)2N(C2H5)2] have been synthesized and characterized by elemental analysis, IR, 1H NMR spectroscopy, TGA, fluorescence and single crystal X-ray diffraction studies. Both the synthesized complexes display intraligand 1(π–π∗) fluorescence and can serve as potential photoactive materials.Figure optionsDownload as PowerPoint slide