Halo and azido copper(II) coordination polymers featuring the gem-diolate forms of di-2-pyridyl ketone

Harikleia Sartzi, Giannis S. Papaefstathiou, Vassilis Psycharis, Albert Escuer, Spyros P. Perlepes, Constantinos C. Stoumpos

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

The reactions of di-2-pyridyl ketone, (py)2CO, with [Cu 2(O2CMe)4(H2O)2] in the presence of NaN3, HCl and HBr have led to the isolation of complexes [[Cu8((Py)2CO2J4(N 3)N36(O2CMe)2]2MeCN. H2O)∞ (1.2MeCN·H2O), [Cu2{(Py) 2C(OH)O)Cl3]∞ (2) and [Cu2[(Py)2C(OH) OJBr3]∞ (3), respectively, where (Py)2CO 22- and (py)2;pC(OH)O- are the dianion and the monoanion of the gem-diol form of (Py)2CO. Complex 1.2MeCN.H 2O is an ID coordination polymer consisting of centrosymmetric [Cu8{(py)2CO2}4 (N3) 6(O2CMe)2] cluster units linked through weakly coordinated azido bridges. The (Py)2CO22- groups adopt the η122: η4 coordination mode, while the N3- ions behave as η2 and η : η :μ3 ligands. The isostructural compounds 2 and 3 are also ID coordination polymers consisting of {Cu2{(py)2C (OH)O)X3}2 units (X-Cl, Br) linked through double halo bridges. The (py)2C(OH)O- ligand adopts the tridentate, bis-chelating η12: η2:μ mode. A common feature in the three complexes is the presence of interchain H-bonding interactions which result in the formation of 2D networks. The magnetic properties of 1-3 have been studied by variable-temperature dc magnetic susceptibility and variable-field magnetization techniques. The analyses of the magnetic data were performed taking into account only the dominant exchange interactions within dinuclear subunits. The intradinuclear exchange interactions have been found to vary from strongly and moderately antiferromagnetic in 1 to ferromagnetic in 2 and 3. This work demonstrates the flexibility, versatility and synthetic potential of combining (py)2CO with carboxylate and azido or halo ligands.

Original languageEnglish (US)
Pages (from-to)100-109
Number of pages10
JournalPolyhedron
Volume29
Issue number1
DOIs
StatePublished - Jan 13 2010

Keywords

  • Copper(II) complexes
  • Crystal structures
  • Di-2-pyridyl ketone
  • Magnetic properties
  • One-dimensional coordination polymers

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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