Two Novel Complexes Based on N-N Bridged Ligand：Syntheses,Crystal Structures,Fluorescence and Magnetic Property

Two novel coordination compounds, 1 [Zn4(L1)4(NO3)2(H2O)2](NO3)2·2H2O and 2 [Mn2(L2)2(DMF)(H2O)3](ClO4)2·DMF (HL1 = N -[(1E)-pyridine-2-ylmethylidene]pyrazine-2carbohydrazide, H2L2 = 2-hydroxy-3-methoxybenzaldehyde(pyrazin-2-ylcarbonyl)hydrazone), based on the N–N bridged ligands were prepared and structurally characterized. Compound 1 represents the [2*2] molecular squares, in which both N atoms belonging to the N–N bridged ligands are connected to the Zn centers. The emission of compound 1 exhibits a blue shift, which can be assigned to strong electrostatic interaction between Zn ions and the L1. Compound 2 represents a rare phenol-O bridged Mn2 complex. The magnetic investigation indicates weak antiferromagnetic interactions between the Mn centers.