Unusual magnetic transition around 210 K in a new 1D molecular solid based on Ni(mnt)_2~- ion

摘要

A new ion-pair complex,[CNBzPyNH_2][Ni(mnt)_2](1),where[CNBzPyNH_2]~+ = l-(4'-cyanobenzyl)-4-aminopyridinium and mnt~(2-)= maleonitriledithiolate,forms a completely segregated uniform stacking column with the Ni...Ni distance 3.863 A and shows a peculiar magnetic transition from paramagnetism in the high-temperature(HT)phase to spin gap in low-temperature(LT)phase around 210 K.The DSC analysis reveals that the phase transition is first order.