Polyoxomolybdate clusters and copper-organonitrogen complexes as building blocks for the construction of composite solids

Douglas Hagrman, Pamela Hagrman, Jon Zubieta

Research output: Contribution to journalArticle

98 Scopus citations

Abstract

The influences of ligand coordination modes on the oxide microstructures in the copper molybdate system were investigated. Rigid bridging ligands such as 4,4'-bypyridine (4,4'-bpy) and 2,4,6-tripyridyltriazine (tptz) afford polymeric cationic substructures with Cu(I) which provide scaffoldings for the entrainment and modification of the molybdenum oxide microstructure. These structural influences are manifested in [{Cu(4,4'-bpy)}2Mo2O7] (MOXI-45) and [{Cu(tpt)}2Mo6O19] (MOXI-46). In contrast, ligands such as pyridine (py) which do not effect the construction of polymeric substructures provide molecular building blocks which combine with the molybdenum oxide motifs in a less predictable fashion. Thus, [{Cu(py)}4Mo8O26] (MOXI-47) is constructed from octamolybdate clusters linked by {Cu(py)}+1 fragments into a virtual two-dimensional network. The interplay of ligand geometry and bonding mode and of metal coordination preferences plays an important role in the structure of [{Cu2(tpypz)(H2O)2}Mo8O26] (MOXI-44), the unique example of a Cu(II)-containing material, with the binucleating tetrapyridylpyrazine ligand (tpypz) providing the organic building unit. The overall structure reflects the binucleating role of the ligand and the distorted octahedral geometry of the Cu(II) centers. The importance of hydrothermal techniques in effecting the syntheses of such composite materials is also discussed. (C) 2000 Elsevier Science S.A.

Original languageEnglish (US)
Pages (from-to)212-224
Number of pages13
JournalInorganica Chimica Acta
Volume300-302
DOIs
StatePublished - Apr 30 2000

Keywords

  • Building blocks
  • Composite materials
  • Copper-organonitrogen complexes
  • Hydrothermal techniques
  • Polyoxomolybdate clusters

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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