TY - JOUR
T1 - A series of manganese-carboxylate coordination polymers exhibiting diverse magnetic properties
AU - Li, Wei
AU - Jia, Hong Peng
AU - Ju, Zhan Feng
AU - Zhang, Jie
PY - 2008
Y1 - 2008
N2 - The hydrothermal reactions of an asymmetrical 4-(4-carboxyphenylamino)-3,5- dinitrobenzoic acid (H2cpdba), MnCl2•4H2O, or together with 2,2′-bipyridine (2,2′-bpy) or 4,4′- bipyridine (4,4′-bpy) afford three novel molecule-based magnetic coordination polymers [Mn(cpdba)]n (1), {[Mn2(cpdba) 2(2,2′-bpy)2(H2O)2] •H2O}n (2) and {[Mn2(cpdba) 2(4,4′-bpy)]•2H2O}n (3). Compound 1 has a 3D acentric coordination network containing carboxylate-bridged 1D ladder-like manganese chains with spin-canted antiferromagnetism (J = -3.51 cm-1 for the coupling along the ladder legs, and zJ′ = 0.22 cm-1 for coupling along the ladder rungs), whereas compounds 2 and 3 crystallize in the centrosymmetric space groups P1 and C2/c, respectively. 2 exhibits a 1D chain structure, which is extended into a 3D supramolecular network by π-π stacking interactions, while 3 features a quite complex 3D network built up from the cpdba2- and 4,4′-bpy spacers as well as the carboxylate-bridged Mn(ii) chains. Both 2 and 3 show weak antiferromagnetic coupling interactions (J = -0.55 cm-1 for 2), and a field-induced spin-flop magnetic transition can also be observed in 2 at ca. 3.2 T at 2 K.
AB - The hydrothermal reactions of an asymmetrical 4-(4-carboxyphenylamino)-3,5- dinitrobenzoic acid (H2cpdba), MnCl2•4H2O, or together with 2,2′-bipyridine (2,2′-bpy) or 4,4′- bipyridine (4,4′-bpy) afford three novel molecule-based magnetic coordination polymers [Mn(cpdba)]n (1), {[Mn2(cpdba) 2(2,2′-bpy)2(H2O)2] •H2O}n (2) and {[Mn2(cpdba) 2(4,4′-bpy)]•2H2O}n (3). Compound 1 has a 3D acentric coordination network containing carboxylate-bridged 1D ladder-like manganese chains with spin-canted antiferromagnetism (J = -3.51 cm-1 for the coupling along the ladder legs, and zJ′ = 0.22 cm-1 for coupling along the ladder rungs), whereas compounds 2 and 3 crystallize in the centrosymmetric space groups P1 and C2/c, respectively. 2 exhibits a 1D chain structure, which is extended into a 3D supramolecular network by π-π stacking interactions, while 3 features a quite complex 3D network built up from the cpdba2- and 4,4′-bpy spacers as well as the carboxylate-bridged Mn(ii) chains. Both 2 and 3 show weak antiferromagnetic coupling interactions (J = -0.55 cm-1 for 2), and a field-induced spin-flop magnetic transition can also be observed in 2 at ca. 3.2 T at 2 K.
UR - http://www.scopus.com/inward/record.url?scp=53049103721&partnerID=8YFLogxK
U2 - 10.1039/b808691e
DO - 10.1039/b808691e
M3 - Article
AN - SCOPUS:53049103721
SN - 1477-9226
SP - 5350
EP - 5357
JO - Dalton Transactions
JF - Dalton Transactions
IS - 39
ER -