摘要
自旋交叉配合物的研究是分子磁化学中的一个重要领域 ,已引起人们的普遍关注 .近期我们设计、制备了配体 2 methyl 1,4,8,9 tetraaza triphenylene (mtt) ,并以此配体合成了一个新的高温自旋交叉配合物 [Fe(mtt) 2 (NCS) 2 ]·2 5H2 O .通过元素分析、核磁共振、红外光谱、电喷雾质谱和紫外光谱等方法对该配体和配合物进行了表征 .变温磁化率研究发现该配合物的自旋转换温度为Tc↑ =3 47K ,Tc↓ =3 43K ,回滞宽度 4K ,是体系 [Fe(L) 2 (NCS) 2 ]中自旋转换温度最高的 .与同体系其它配合物比较 。
The study of the spin-crossover phenomenon is an important field of magnetochemistry, which has attracted much attention. A new ligand, 2-methyl-1,4,8,9-tetraaza-triphenylene (mtt) and its complex, [Fe(mtt)_2(NCS)_2]·2 5H_2O, exhibiting high temperature spin crossover were prepared. Elemental analysis, 1H NMR, infrared spectrum, electrospray ionization mass spectrum and ultraviolet spectrum were used to study the structure of the ligand and the complex. The variable-temperature magnetic susceptibility study shows that the temperatures of spin transition are T_c↑=347 K and T_c↓=343 K, respectively, and the hysteresis loop is 4 K, which is the highest spin crossover temperature in the kind of [Fe(L)_2(NCS)_2] system. By comparing the complex with other similar structural complexes, it is revealed that the modification of ligand will influence greatly the critical temperature and hysteresis loop of spin crossover.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2004年第5期489-492,共4页
Acta Chimica Sinica
基金
国家自然科学基金 (No.G2 0 0 1 0 0 4 )
江苏省教育厅自然科学基金 (No.0 2KJB1 50 0 1 0 )资助项目
