Diverse manganese(II) coordination polymers derived from achiral/chiral imidazolium-carboxylate zwitterions and azide: structure and magnetic properties

作者：Wang, Xuan; Li, Xiu-Bing; Yan, Ren-He; Wang, Yan-Qin; Gao, En-Qing^*

来源：Dalton Transactions, 2013, 42(27): 10000-10010.

DOI：10.1039/c3dt50510c

• SINGLE-MOLECULE MAGNET
• FUNCTIONALIZED IONIC LIQUID
• ONE-POT SYNTHESIS
• END-ON AZIDO
• MIXED AZIDE
• WEAK FERROMAGNETISM
• BRIDGED TRINUCLEAR
• CRYSTAL-STRUCTURE
• HYDROTHERMAL SYNTHESIS
• TRICOMPONENT AZIDE

Five Mn(II) coordination polymers containing azide and carboxylate as simultaneous bridges have been derived from different imidazolium-carboxylate zwitterionic ligands: 1-methyl-3-(carboxylatomethyl) imidazolium (L-1), 1,3-bis(carboxylatomethyl)imidazolium (L-2), (S,S)-, (R,R)-, and (R,S)-1,3-bis(1-carboxylatoethyl)imidazolium (S,S-L-3, R,R-L-3 and R,S-L-3). The compounds are formulated as [Mn(L-1)(N-3)(2)] (1), [Mn-(L-2)(N-3)] (2), [Mn(R,R-L-3)(N-3)]center dot 0.5CH(3)OH (3-R), [Mn(SS-L-3)(N-3)]center dot 0.5CH(3)OH (3-S), [Mn(R,S-L-3)(N-3)] (4). In compound 1, the neutral monocarboxylate zwitterion ligand (L-1) leads to uniform chains with bis(azide)-(carboxylate) bridges. For compounds 2-4, the anionic dicarboxylate zwitterions L-2 and L-3 lead to (azide)-bis(carboxylate) bridges, but the overall coordination networks are different. In 2 and 3-S (or 3-R), chains with the (azide)bis(carboxylate) bridges are connected by L-2 and S,S-L-3 (or R,R-L-3), respectively, to give achiral and chiral 2D coordination networks with different connecting topologies. In compounds 4, which is derived from the mesomeric ligand R,S-L-3, linear trinuclear units with the (azide)bis(carboxylate) bridges are linked by mu-1,3 azides to give 2D layers, and the layers are pillared into a 3D framework by the 1,3-dimethyleneimidazolium tethers. Magnetic analyses suggested that compounds 1-3 behave as 1D antiferromagnetic systems, while 4 shows canted antiferromagnetism with weak ferromagnetic ordering below T-C = 12.4 K.

• 出版日期2013
• 单位华东师范大学