Synthesis and Fluorescence Property of [Ni~(III)(chxn)_2Br]Br_2、[Ni~II(chxn)_2]Br_2 and [Ni~II(en)_2]Br_2 Complexes

A series of single crystals of the complexes of nickel hydrate with chxn(chxn =1(R),2(R)-diaminocyclohexane) and en(en =ethylenediamine) were synthesized in dry N_2 atmosphere and absolute methanol.The composition and the crystal structure of the complexes were tested.The spectroscopic properties were compared using solid UV spectrophotometer and fluorescence spectrophotometer.The experimental results showed that the position and intensity of the UV absorption bands of the two and three valence nickel complexes were apparently different.The two ligands and compounds are all stable luminescence material.The two ligands emit intensive fluorescence at the peak wavelength of 408 nm,whereas the weaker emission of the three valence nickel complexes shifts to 360 nm.