TY - JOUR
T1 - Diverse manganese(II) coordination polymers with mixed azide and zwitterionic dicarboxylate ligands
T2 - Structure and magnetic properties
AU - Wang, Yan Qin
AU - Jia, Qin Xiang
AU - Wang, Kun
AU - Cheng, Ai Ling
AU - Gao, En Qing
PY - 2010/2/15
Y1 - 2010/2/15
N2 - The reactions of manganese(II) acetate or perchlorate, sodium azide, and the inner-salt-type dicarboxylate ligand 1, 3-bis(4-carboxylato-1-pyridinium) propane (L) under different conditions yielded four different MnII coordination polymers with mixed azide and carboxylate bridges: {[Mn(L)(N3)] ClO4 · 0.5H2O}n (1), {[Mn2(L) 2(N3)2][Mn(N3)4(H 2O)2] · 2H2O}n (2), {[Mn 2(L)2(N3)2(H2O) 2]Br(N3) · 2H2O}n (3), and [Mn4 (L)2(N3)8]n (4). The compounds exhibit great diversity in their structures and magnetic properties. Both 1 and 2 contain anionic chains featuring a mixed (OCO)2(EO- N3) triple bridge (EO = end-on) between adjacent MnII ions. In 1, two independent sets of triple bridges with apparently different structural parameters alternate in the AABB sequence, and the resulting alternating chains are cross-linked into a cationic 3D framework by the cationic dipyridinium spacers. Differently, the chains in 2 have uniform bridges and are interlinked into a 2D coordination layer. An expression of the magnetic susceptibility for 1D systems with alternating J1J1J 2J2 interactions has been deduced and applied to 1. Magnetic studies on 1 and 2 reveal that the (OCO)2(EO-N3) triple bridges induce antiferromagnetic coupling between MnII ions, and magnetostructural analyses suggest that the magnitude of the coupling can be correlated to the Mn-N and Mn-N-Mn parameters. Compound 3 contains 2D coordination layers in which the chains with alternating double EO-azide and double carboxylate bridges are interlinked by the dipyridinium spacers, and magnetic studies suggest alternating ferro-and antiferromagnetic interactions through the alternating bridges. The 3D framework of compound 4 is formed by the organic ligands interlinking the uniquemanganese-azide-carboxylate layers in which the [Mn4(μ 3-N3)2(μ 2-N3)2(mu; 2-COO)4] clusters are interlinked through EE-azide bridges (EE = end-to-end). The structure represents a novel type of self-catenated 8-connected 3D net. Magnetostructural analyses suggest that all of the short bridging moieties in 4, including (μ 3-EO-N3)2, (OCO)(EO-N 3), (OCO)(EO-N3)2, and single EE-N3, propagate antiferromagnetic coupling.
AB - The reactions of manganese(II) acetate or perchlorate, sodium azide, and the inner-salt-type dicarboxylate ligand 1, 3-bis(4-carboxylato-1-pyridinium) propane (L) under different conditions yielded four different MnII coordination polymers with mixed azide and carboxylate bridges: {[Mn(L)(N3)] ClO4 · 0.5H2O}n (1), {[Mn2(L) 2(N3)2][Mn(N3)4(H 2O)2] · 2H2O}n (2), {[Mn 2(L)2(N3)2(H2O) 2]Br(N3) · 2H2O}n (3), and [Mn4 (L)2(N3)8]n (4). The compounds exhibit great diversity in their structures and magnetic properties. Both 1 and 2 contain anionic chains featuring a mixed (OCO)2(EO- N3) triple bridge (EO = end-on) between adjacent MnII ions. In 1, two independent sets of triple bridges with apparently different structural parameters alternate in the AABB sequence, and the resulting alternating chains are cross-linked into a cationic 3D framework by the cationic dipyridinium spacers. Differently, the chains in 2 have uniform bridges and are interlinked into a 2D coordination layer. An expression of the magnetic susceptibility for 1D systems with alternating J1J1J 2J2 interactions has been deduced and applied to 1. Magnetic studies on 1 and 2 reveal that the (OCO)2(EO-N3) triple bridges induce antiferromagnetic coupling between MnII ions, and magnetostructural analyses suggest that the magnitude of the coupling can be correlated to the Mn-N and Mn-N-Mn parameters. Compound 3 contains 2D coordination layers in which the chains with alternating double EO-azide and double carboxylate bridges are interlinked by the dipyridinium spacers, and magnetic studies suggest alternating ferro-and antiferromagnetic interactions through the alternating bridges. The 3D framework of compound 4 is formed by the organic ligands interlinking the uniquemanganese-azide-carboxylate layers in which the [Mn4(μ 3-N3)2(μ 2-N3)2(mu; 2-COO)4] clusters are interlinked through EE-azide bridges (EE = end-to-end). The structure represents a novel type of self-catenated 8-connected 3D net. Magnetostructural analyses suggest that all of the short bridging moieties in 4, including (μ 3-EO-N3)2, (OCO)(EO-N 3), (OCO)(EO-N3)2, and single EE-N3, propagate antiferromagnetic coupling.
UR - https://www.scopus.com/pages/publications/77249083715
U2 - 10.1021/ic901798y
DO - 10.1021/ic901798y
M3 - 文章
AN - SCOPUS:77249083715
SN - 0020-1669
VL - 49
SP - 1551
EP - 1560
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 4
ER -