A new quasi-one-dimensional molecular solid based on Ni(mnt)(2) anion: Crystal structure and spin-gap transition

作者：Ni, Chunlin^*; Liu, Xiaoping; Yu, Linliang; Yang, Lemin

来源：Journal of Physics and Chemistry of Solids, 2007, 68(1): 59-65.

DOI：10.1016/j.jpcs.2006.09.016

• magnetic materials
• crystal structure
• magnetic properties

A new molecular solid, [1-(4'-bromo-2'-fluorobenzyl)-4-dimetylaminopyridinium]-bis(mateonitriledithiolato)nickel(III), (BrFBzPyN (CH3)(2)(Ni(mnt)(2))(1), has been prepared and characterized by elemental analyses, IR, ESI-MS spectra, single crystal X-ray diffraction and magnetic. measurements. Compound 1 crystallizes in the orthorhombic space group Puma, a = 20.579(4) A, b = 7.078(1) angstrom, c = 17.942(4) angstrom, alpha = beta = gamma = 90 degrees, V = 2613.3(9) angstrom(3), Z = 4. The Ni(III) ions of 1 form a quasi-one-dimensional Zigzag magnetic chain within a Ni(mnt)(2)(-) column through Ni center dot center dot center dot S, S center dot center dot center dot S, Ni center dot center dot center dot Ni, or pi center dot center dot center dot pi interactions with an Ni center dot center dot center dot Ni distance of 4.227 angstrom. Magnetic susceptibility measurements in the temperature range 2-300K show that I exhibits a spin-gap transition around 200K, and antiferromagnetic interaction in the high-temperature phase (HT) and spin gap in the low-temperature phase (LT). The transition for 1 is second-order phase transition as determined by DSC analyses.

• 出版日期2007-1
• 单位华南农业大学