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The Spin Gap Transition around 180 K Observed in a New Molecular Magnet based on the [Ni(mnt) 2 ] – Monoanion and Substituted Benzylpyridinium
Author(s) -
Zuo Hongrong,
Huang Qian,
Hou Yong,
Ni Chunlin,
Hu Xuelei
Publication year - 2008
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200800200
Subject(s) - antiferromagnetism , stacking , intermolecular force , chemistry , crystallography , hydrogen bond , spin (aerodynamics) , phase transition , phase (matter) , ion , magnetic susceptibility , condensed matter physics , molecule , physics , organic chemistry , thermodynamics
A new molecular magnet, [NO 2 BrBzPyCH 3 ][Ni(mnt) 2 ] ( 1 ) ([NO 2 BrBzPyCH 3 ] + = 1‐(2′‐bromo‐4′‐nitrobenzyl)‐2‐methylpyridinium, and mnt 2– = maleonitriledithiolate), has been prepared and characterized by single crystal X‐ray diffraction and magnetic measurements. The Ni(III) ions of 1 form a quasi‐one‐dimensional alternating zig‐zag magnetic chain within a Ni(mnt) 2 – column by intermolecular Ni···S, Ni···Ni or π···π interactions, and the [NO 2 BrBzPyCH 3 ] + cations stack into a column via weak Br···O interaction, p···π stacking interactions and C‐H···O hydrogen bonds between the cations. Magnetic susceptibility measurements in the temperature range 1.8‐300 K show that 1 exhibits a spin‐gap transition around 180 K, and an antiferromagnetic interaction in the high‐temperature phase (HT) and spin gap behavior in the low‐temperature phase (LT). The transition for 1 is a second‐order phase transition as determined by DSC analyses.