TY - JOUR
T1 - Structural diversity of the mixed-ligand system Mn-cpdba-2,2′-bpy controlled by temperature
AU - Sun, Jian Ke
AU - Li, Wei
AU - Cai, Li Xuan
AU - Zhang, Jie
PY - 2011/3/7
Y1 - 2011/3/7
N2 - A series of Mn-cpdba-2,2′-bpy complexes, {[Mn(cpdba)(2,2′-bpy)] }n1, {[Mn2(cpdba)2(2,2′-bpy)(H 2O)2]·3H2O}n2, {[Mn 2(cpdba)2(2,2′-bpy)2(H2O) 2]·H2O}n3, {[Mn(cpdba)(2,2′-bpy)] ·1.5H2O}n4, {[Mn4(cpdba) 4(2,2′-bpy)3(H2O)2]} n5 (H2cpdba = 4-(4-carboxyphenylamino)-3,5-dinitrobenzoic acid; 2,2′-bpy = 2,2′-bipyridine) have been synthesized at different temperatures under hydrothermal conditions. Complex 1 has a 2D (4,4) network with alternate left and right-handed helical chains. With increasing temperature to 150°C, complex 2, which has a complicated 3D framework constructed by a unique building block Mn3(cpdba)6(2,2′-bpy) 2, can be obtained. Complex 3 that has been reported previously was obtained at 160°C. This complex exhibits a 1D chain structure which is extended into a 3D supermolecular framework by π-π stacking interactions. Complex 4 was detected as a by-product in the synthesis of 3. X-Ray single crystal diffraction analysis reveals the formation of 2D layer network containing [Mn(CO2) + Mn(CO2)]n double-helices. With continuing increase to 170°C, complex 5 featuring 3D framework similar to 2, with the decrease in the coordinated water and lattice water molecules as well as increase in the regularity of the framework, was formed. Influence of the 2,2′-bpy co-ligand on the coordination configuration of the cpdba 2- ligand has been discussed. The magnetic susceptibility measurements of 1 and 5 reveal that two complexes exhibit antiferromagnetic coupling interactions.
AB - A series of Mn-cpdba-2,2′-bpy complexes, {[Mn(cpdba)(2,2′-bpy)] }n1, {[Mn2(cpdba)2(2,2′-bpy)(H 2O)2]·3H2O}n2, {[Mn 2(cpdba)2(2,2′-bpy)2(H2O) 2]·H2O}n3, {[Mn(cpdba)(2,2′-bpy)] ·1.5H2O}n4, {[Mn4(cpdba) 4(2,2′-bpy)3(H2O)2]} n5 (H2cpdba = 4-(4-carboxyphenylamino)-3,5-dinitrobenzoic acid; 2,2′-bpy = 2,2′-bipyridine) have been synthesized at different temperatures under hydrothermal conditions. Complex 1 has a 2D (4,4) network with alternate left and right-handed helical chains. With increasing temperature to 150°C, complex 2, which has a complicated 3D framework constructed by a unique building block Mn3(cpdba)6(2,2′-bpy) 2, can be obtained. Complex 3 that has been reported previously was obtained at 160°C. This complex exhibits a 1D chain structure which is extended into a 3D supermolecular framework by π-π stacking interactions. Complex 4 was detected as a by-product in the synthesis of 3. X-Ray single crystal diffraction analysis reveals the formation of 2D layer network containing [Mn(CO2) + Mn(CO2)]n double-helices. With continuing increase to 170°C, complex 5 featuring 3D framework similar to 2, with the decrease in the coordinated water and lattice water molecules as well as increase in the regularity of the framework, was formed. Influence of the 2,2′-bpy co-ligand on the coordination configuration of the cpdba 2- ligand has been discussed. The magnetic susceptibility measurements of 1 and 5 reveal that two complexes exhibit antiferromagnetic coupling interactions.
UR - http://www.scopus.com/inward/record.url?scp=79951775568&partnerID=8YFLogxK
U2 - 10.1039/c0ce00297f
DO - 10.1039/c0ce00297f
M3 - Article
AN - SCOPUS:79951775568
SN - 1466-8033
VL - 13
SP - 1550
EP - 1556
JO - CrystEngComm
JF - CrystEngComm
IS - 5
ER -