Three-dimensional mesomeric networks assembled from helix-linked sheets: syntheses, structures, and magnetisms.
Two new three-dimensional nickel coordination polymers, [Ni3(BTC)2(4,4'-bpy)2(H2O)5].1.5H2O (1) and [Ni(PDB)(4,4'-bpy)].0.5H2O (2)(4,4'-bpy = bipyridine, BTC = 1,2,4-benzenetricarboxylate, PDB = pyridine-3,4-dicarboxylate), have been synthesized under hydrothermal conditions and characterized by elemental analysis, IR, TGA, and single crystal X-ray diffraction. Both compounds contain 2D scaffolding motifs, and most interestingly adjacent scaffolds are connected by infinite helical chains into unique three-dimensional mesomeric networks. Moreover, temperature-dependent magnetic susceptibilities for the two compounds were studied, and ferromagnetic interactions through syn-anti carboxylate bridges between Ni sites have been observed.
Qin
Chao
C
Department of Chemistry, Northeast Normal University, Changchun 130024, P. R. China.
Wang
Xin-Long
XL
Li
Yang-Guang
YG
Wang
En-Bo
EB
Su
Zhong-Min
ZM
Xu
Lin
L
Clérac
Rodolphe
R
D018360:Crystallography, X-Ray; D008280:Magnetics; D008958:Models, Molecular; D009532:Nickel / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry; D011725:Pyridines; D013696:Temperature
D009942:Organometallic Compounds; D011725:Pyridines; D009532:Nickel; C034306:4,4'-bipyridyl