Self-assembly of the cyclic dimer [Cu(hfac)2(bpmu)]2 (bpmu = N,N′-bis(3-pyridylmethyl)urea; hfac = hexafluoroacetylacetonate ion) using coordination chemistry and predictable O=C(N-H)2•••O=C hydrogen bonds

被引:4
作者
Granifo, J
Garland, MT
Baggio, R
机构
[1] Univ La Frontera, Fac Ingn Ciencias & Adm, Dept Ciencias Quim, Temuco, Chile
[2] Univ Chile, Fac Ciencias Fis & Matemat, Dept Fis, Santiago, Chile
[3] Ctr Invest Interdisciplinaria Avanzada Ciencias Ma, Santiago, Chile
[4] Comis Nacl Energia Atom, Dept Fis, RA-1650 San Martin, Buenos Aires, Argentina
关键词
dimeric copper(II) complexes; polypyridine complexes; N; '-bis(3-pyridylmethyl)urea; supramolecular chemistry; hydrogen bonded assembly;
D O I
10.1016/j.inoche.2005.03.018
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
A novel binuclear metallacyclic complex, [Cu(hfa)(2)(bpmu)](2), was isolated by reacting copper(II) hexafluoroacetylacetonate with the bpmu ligand. The crystal structure reveals the presence of dimetal units with the Cu(II) centers in a six-coordinate environment and bridged by the bpmu spacers. The crystal consists of a racemate with the two copper(II) ions of one dimer molecule carrying either a Delta Delta or Lambda Lambda configuration. The pyridyl-urea-based spacers are connected intramolecularly by the expected strong urea-based hydrogen bonds O=C(N-H)(2)center dot center dot center dot O=C. The same type of H-bonds allows the molecular units of the same chirality to assemble forming supramolecular columns. This conformationally defined array and hydrogen-bonding network, together with the bulky properties of the fragment {Cu(hfa)(2)}, were used as a pre-programmed supramolecular information for controlling the formation of discrete species. (C) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:568 / 573
页数:6
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