A Single-Molecule Magnet Based on Heptacyanomolybdate with the Highest Energy Barrier for a Cyanide Compound

Three trinuclear Mn2Mo
molecules based on the orbitally
degenerate [Mo­(CN)7]4– anion were prepared,
one of which is the first single-molecule magnet (SMM) based on heptacyanomolybdate.
The blocking temperature and the energy barrier (U = 40.5 cm–1) are records for a cyanide-based SMM.
Wide hysteresis loops and sharp quantum tunneling steps were observed
from single-crystal measurements.

本研究制备了三款基于轨道简并[Mo(CN)₇]⁴⁻阴离子的三核Mn₂Mo分子，其中一款为首例基于七氰合钼酸盐的单分子磁体（single-molecule magnet, SMM）。该体系的阻塞温度与能垒（U=40.5 cm⁻¹）均创下氰基类单分子磁体的性能纪录。单晶测量结果显示其具备宽幅磁滞回线与尖锐的量子隧穿台阶。