Synthesis,crystal structure and magnetic property of a two-dimensional herringbone-like network with praseodymium(III) nitrate and 1-bromo-3,5-bis(imidazol-1-ylmethyl)benzene (bib)

摘要

A new complex [Pr(bib)_2(NO_3)_3] (1) was synthesized by reaction of bidentate imidazole-containing ligand 1-bromo-3,5-bis(imidazol-1-ylmethyl)benzene (bib) with Pr(NO_3) centre dot 6H_2O and characterized by X-ray crystallography.Complex 1 has a two-dimensional herringbone-like structure with the ligand bib serving as a bridging ligand using its two imidazolyl nitrogen atoms.Ligand bib adopts cis and trans two different conformations,and the Pr(III) atoms are bridged by bib in two different ways.Thermogravimetric analysis for complex 1 was carried out and the result shows that the complex is stable up to 180 deg C.Variable-temperature magnetic susceptibility of complex 1 was measured between 1.8 and 300 K and the result shows that the _(XM)T value decreases continuously over the whole temperature range.