Yang Xu-Feng, Liu Min, Zhu Hai-Bin, Hang Cheng, Zhao Yue
School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China.
Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210023, China.
Dalton Trans. 2017 Dec 12;46(48):17025-17031. doi: 10.1039/c7dt03568c.
Two new coordination polymers, Cu(Hbsal)(4,4'-bpy) (1) and Cu(bsal)(4,4'-bpy)·DMF (2), have been synthesized from 5-bromosalicylic acid (Hbsal) and the auxiliary ligand 4,4'-bipyridine (4,4'-bpy) through a slow diffusion method. Compound 1 is composed of parallel 1D linear chains, whereas compound 2 represents a non-interpenetrated 3D sod net which is constructed from left and right-handed helical chains alternately separated by 4,4'-bpy. The most interesting finding is that compound 1 can be irreversibly transformed into 2 in a crystal-to-crystal manner in the case that compound 1 is immersed in the DMF solvent. Particularly, the 1D-to-3D crystal-to-crystal structural transformation also incurs a drastic change in the magnetic properties of 1 and 2.
通过缓慢扩散法，由5-溴水杨酸（Hbsal）和辅助配体4,4'-联吡啶（4,4'-bpy）合成了两种新型配位聚合物Cu（Hbsal）（4,4'-bpy）（1）和Cu（bsal）（4,4'-bpy）·DMF（2）。化合物1由平行的一维线性链组成，而化合物2代表一种非穿插的三维sod网络，它由左旋和右旋螺旋链交替排列，中间由4,4'-bpy隔开。最有趣的发现是，在将化合物1浸入DMF溶剂的情况下，化合物1可以以晶对晶的方式不可逆地转变为化合物2。特别地，从一维到三维的晶对晶结构转变也导致了化合物1和2的磁性发生剧烈变化。
