Isolation and Characterization of Different Homometallic and Heterobimetallic Complexes of Nickel and Zinc Ions by Controlling Molar Ratios and Solvents. Issue 24 (27th May 2019) - Kushvaha, Saroj Kumar
Abstract : This work describes employment of two structurally similar Schiff‐base ligands (H2 L and H2 L‐Me) [H2 L = C14 H13 NO3 and H2 L‐Me = C15 H15 NO3 ] for the synthesis of three homo‐metallic Zn II and two hetero‐bimetallic Zn II –Ni II based multinuclear complexes {[Zn II 4 L4 (MeOH)2 ] (1 ), [Zn II 5 (L)5 (MeOH)2 ]· MeOH· CH3 CN (2 ), [(L)2 Zn II 4 Cl2 (µ3 ‐OMe)2 (MeOH)2 ]· 2MeOH (3 ), [Ni II 2 Zn II 2 (L)4 (MeOH)2 ] (4 ) and [Ni3 Zn2 (L‐Me)5 (H2 O)2 ]· MeOH· CH3 CN (5 )} with different interesting structural core topologies. All of these complexes (1–5 ) have been characterized by single‐crystal X‐ray diffraction (XRD), elemental analysis, and UV/Vis and Fourier transform infrared (FTIR) spectroscopy. The fluorescence properties of Zn II ‐containing complexes have been studied by measuring fluorescence spectra in solid state and solution phase. The luminescence behavior has been further quantified by fluorescence life‐time and quantum yield measurements. Using high resolution mass spectrometry (HR‐MS), the molecular integrity of complexes in the solution phase has been demonstrated by simulating isotopic distribution of molecules with theoretically calculated molecular isotopic patterns. The magnetic properties of Zn II –Ni II containing complexes (4–5 ) have been studied in the temperature range from 5 K to 300 K. Thermogravimetric analysis (TGA) has been carried out to study the thermal stabilities of these complexes (1–5 ). Abstract : Five Ni II /Zn II based multinuclear complexes have been synthesized and characterized by single crystal XRD. The luminescence properties of the complexes 1 –3 have been studied by fluorescence spectra. The fluorescence properties have also been quantified by quantum yield and life time measurements. Magnetic properties of complexes 4 –5 have been studied by temperature dependent direct‐current magnetic susceptibility measurements.