Isomerism with Metallacalix[4]arenes of the Nonsymmetrical Pyrimidine Nucleobase Cytosine: How Connectivity and Rotamer State Determine the Topology of Multinuclear Derivatives
2010; American Chemical Society; Volume: 49; Issue: 17 Linguagem: Inglês
10.1021/ic100794s
ISSN1520-510X
AutoresAnupam Khutia, Pablo J. Sanz Miguel, Bernhard Lippert,
Tópico(s)Metal-Organic Frameworks: Synthesis and Applications
ResumoTwo cyclic octanuclear complexes, 2 and 3, of cation composition [{Pd(bpy)}8C4]8+ (bpy = 2,2′-bipyridine) form side by side when [Pd(bpy)(H2O)2]2+ and cytosine (H2C) are reacted in water. The two complexes are isomers, composed of central metallacalix[4]arene backbones to which four additional Pd(bpy) units are bonded pairwise to exocyclic groups of the C2− ligands. As a consequence of differences in the N1−N3 connectivity patterns of the two central Pd4C4 rings and 1,3-alternate rotamer states of cytosinate in both compounds, the spatial arrangements of exocyclic groups are distinctly different, leading to two Pd3 stacks and two Pd1 entities in 2, yet to four Pd2 stacks in 3.
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