TY - JOUR
T1 - Mixed azide-carboxylate bridged tri- and tetranuclear MnII clusters in coordination polymers derived from a zwitterionic dicarboxylate ligand
T2 - Structures and magnetism
AU - Ma, Yu
AU - Wang, Kun
AU - Gao, En Qing
AU - Song, You
PY - 2010/9/7
Y1 - 2010/9/7
N2 - Two MnII coordination polymers with azide and the zwitterionic dicarboxylate ligand bis(N-carboxymethyl-4-pyridinium) (bcp) were synthesized, and structurally and magnetically characterized. They are formulated as [Mn 3(bcp)2(N3)2(SO4) 2(H2O)4]·6H2O (1) and [Mn4(bcp)2(N3)8(H2O) 2]·4H2O (2). Compound 1 contains anionic linear [Mn3(N3)2(COO)4(SO4) 2(H2O)4]4- units with simultaneous μ2-EO (end-on) azide, sulfate and carboxylate bridges, while compound 2 contains [Mn4(COO)4(N3) 8(H2O)2]4- clusters with mixed μ2-EO azide, μ3-EO azide and carboxylate bridges. In these compounds, the anionic tri- or tetranuclear units are linked into coordination chains by the cationic bipyridinium spacers, and are also hydrogen bonded into chains by double O-H⋯O bridges. Magnetic analyses were carried out on temperature-variable susceptibility data for both compounds, and also on isothermal magnetization data for 1. It is revealed that all the mixed double and triple bridges, [(EO-N3)(COO)(SO4)] in 1, [(COO)(EO-N3)2] and [(COO)(EO-N3)] in 2, transmit antiferromagnetic coupling between MnII ions. The [(EO-N3)2] bridge in 2, with Mn-N-Mn = 96.6°, also transmits antiferromagnetic coupling, providing the first example in the antiferromagnetic regime predicted theoretically for double EO-azide bridges between MnII ions. The double hydrogen bonding [(O-H⋯O) 2] bridges in both compounds induce weak antiferromagnetic interactions.
AB - Two MnII coordination polymers with azide and the zwitterionic dicarboxylate ligand bis(N-carboxymethyl-4-pyridinium) (bcp) were synthesized, and structurally and magnetically characterized. They are formulated as [Mn 3(bcp)2(N3)2(SO4) 2(H2O)4]·6H2O (1) and [Mn4(bcp)2(N3)8(H2O) 2]·4H2O (2). Compound 1 contains anionic linear [Mn3(N3)2(COO)4(SO4) 2(H2O)4]4- units with simultaneous μ2-EO (end-on) azide, sulfate and carboxylate bridges, while compound 2 contains [Mn4(COO)4(N3) 8(H2O)2]4- clusters with mixed μ2-EO azide, μ3-EO azide and carboxylate bridges. In these compounds, the anionic tri- or tetranuclear units are linked into coordination chains by the cationic bipyridinium spacers, and are also hydrogen bonded into chains by double O-H⋯O bridges. Magnetic analyses were carried out on temperature-variable susceptibility data for both compounds, and also on isothermal magnetization data for 1. It is revealed that all the mixed double and triple bridges, [(EO-N3)(COO)(SO4)] in 1, [(COO)(EO-N3)2] and [(COO)(EO-N3)] in 2, transmit antiferromagnetic coupling between MnII ions. The [(EO-N3)2] bridge in 2, with Mn-N-Mn = 96.6°, also transmits antiferromagnetic coupling, providing the first example in the antiferromagnetic regime predicted theoretically for double EO-azide bridges between MnII ions. The double hydrogen bonding [(O-H⋯O) 2] bridges in both compounds induce weak antiferromagnetic interactions.
UR - https://www.scopus.com/pages/publications/77955461158
U2 - 10.1039/c0dt00288g
DO - 10.1039/c0dt00288g
M3 - 文章
AN - SCOPUS:77955461158
SN - 1477-9226
VL - 39
SP - 7714
EP - 7722
JO - Dalton Transactions
JF - Dalton Transactions
IS - 33
ER -