Exploring conformationally flexible hydrogen-bond-functionalized ligand and counter anions in metal-organic frameworks of Cu(II)

• Autores: D. Krishna Kumar
• Localización: New journal of chemistry, ISSN 1144-0546, Vol. 30, Nº 9, 2006, págs. 1267-1275
• Idioma: inglés
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• Resumen

  • Single crystal structures of six metal–organic frameworks (MOFs) derived from N,N′-bis(3-pyridyl)urea L1 and Cu(II) salts having different counter ions have been investigated to study the plausible role of conformationally flexible hydrogen-bond-functionalized ligand L1 and counter ions on the resultant topologies of the MOFs. The ligand adopts the energetically least stable syn–syn conformation in most of the MOFs. The 1 : 2 metal–ligand coordination polymers display looped chain topologies with square-pyramidal metal center whereas 1 : 1 metal–ligand coordination polymers show 1D zigzag infinite chain. Although the urea functionality of the ligand does recognize the anions via various N–H⋯O/F interactions, the counter anions do not influence the primary framework structures.