TY - JOUR
T1 - Supramolecular architectures through first- and second-sphere coordination of a flexible zwitterionic dicarboxylate ligand
AU - Ma, Yu
AU - Cheng, Ai Ling
AU - Tian, Chun Yan
AU - Tian, Hua
AU - Gao, En Qing
PY - 2009/10/29
Y1 - 2009/10/29
N2 - The supramolecular architectures formed through the first- or second-sphere coordination between 1,4-diazoniabicyclo[2.2.2]octane-l,4-diacetate and different divalent metal ions have been described. They are formulated as [Ni(SCN)2(H2O)4](L)2(H2O)2 (1), [M(SCN)2(H2O)8](L)2(H2O)4 M = Co (2) and Mn (3) and [Zn(L)(SCN)2] (4). In the Zn(II) compound, the zwitterionic ligand is directly coordinated to the metal ion, and the tetrahedral coordination of Zn(II) and the C-shaped bridging conformation of the ligand combine to result in a M2L2 metallacyclic molecule. In the Ni(II), Co(II) and Mn(II) compounds, the ligand is not involved in first-sphere coordination, and the crystal structure is governed by the second-sphere coordination (hydrogen bonding involving the first sphere). The octahedral [M(SCN)2(H2O)4] first-sphere coordination provides a specific array of hydrogen donor sites for the pseudo-octahedral second-sphere coordination of six carboxylate groups from different S-shaped zwitterions, and the zwitterions serve as 3-connecting bridges between the first-sphere motifs to produce a hydrogen-bonded rutile-type network. The structures illustrate the great potential of combining the first- or second-sphere coordination to produce intriguing metal-organic networks.
AB - The supramolecular architectures formed through the first- or second-sphere coordination between 1,4-diazoniabicyclo[2.2.2]octane-l,4-diacetate and different divalent metal ions have been described. They are formulated as [Ni(SCN)2(H2O)4](L)2(H2O)2 (1), [M(SCN)2(H2O)8](L)2(H2O)4 M = Co (2) and Mn (3) and [Zn(L)(SCN)2] (4). In the Zn(II) compound, the zwitterionic ligand is directly coordinated to the metal ion, and the tetrahedral coordination of Zn(II) and the C-shaped bridging conformation of the ligand combine to result in a M2L2 metallacyclic molecule. In the Ni(II), Co(II) and Mn(II) compounds, the ligand is not involved in first-sphere coordination, and the crystal structure is governed by the second-sphere coordination (hydrogen bonding involving the first sphere). The octahedral [M(SCN)2(H2O)4] first-sphere coordination provides a specific array of hydrogen donor sites for the pseudo-octahedral second-sphere coordination of six carboxylate groups from different S-shaped zwitterions, and the zwitterions serve as 3-connecting bridges between the first-sphere motifs to produce a hydrogen-bonded rutile-type network. The structures illustrate the great potential of combining the first- or second-sphere coordination to produce intriguing metal-organic networks.
KW - Second-sphere coordination
KW - Supramolecular architectures
KW - Thiocyanate
KW - Zwitterionic ligand
UR - https://www.scopus.com/pages/publications/69549089810
U2 - 10.1016/j.molstruc.2009.07.003
DO - 10.1016/j.molstruc.2009.07.003
M3 - 文章
AN - SCOPUS:69549089810
SN - 0022-2860
VL - 935
SP - 129
EP - 135
JO - Journal of Molecular Structure
JF - Journal of Molecular Structure
IS - 1-3
ER -