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| Three europium complexes, Eu(DAPABH)2Cl3 (1), Eu(DAPMBH)2(NO3)3.2H2O (2) and Eu(DAPBSH)(DMSO)2NO3(OH)2 (3) have been synthesized and characterized by various spectroscopic techniques, where DAPABH=2,6-diacetylpyridine-bis(4-aminobenzoyhydrazone), DAPMBH=2,6-diacetylpyridine-bis(4-methoxybenzoyhydrazone), DAPBSH=2,6-diacetylpyridine-bis(benzenesulfonyldrazide). The crystal structure of 1 and 3 were established via single crystal X-ray crystallography. The Eu3+ ion is ten-coordinated with six N-atoms and four O-atoms from two pentadentate DAPABH ligands to form a bicapped tetragonal antiprism geometry in 1, while the nine-coordinate Eu3+ ion is bound to two oxygen atoms of the nitrate counter ion, three N-atoms and two O-atoms of a pentadentate DAPBSH ligands as well as to two oxygen atoms of two disorder dimethyl sulfoxide molecules with a bicapped tetragonal antiprism coordination environment in 3. We have exploited their photo-physical abilities through fluorescence excitation spectrum and fluorescence emission spectrum both in solid state and solution state. |
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| Keywords:Rare earth ion, Schiff base ligands, crystal structure, luminescence property |
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