Synthesis, crystal structure and properties of three new holmium 2-fluorobenzoato complexes

This paper reports three new holmium 2-fluorobenzoato (2-FBA) complexes with 1,10-phenanthroline (phen), 2,20-bipydine (2,20-bpy) and 4,40-bipyridine, respectively. A rare and interesting structural feature of holmium 2-FBA complex containing phen is two non-equivalent binuclear molecules existed in an asymmetric unit, namely, [Ho(2-FBA)3$phen$CH3CH2OH]2 and [Ho(2-FBA)3$phen]2. The dimeric complex [Ho(2-FBA)3$2,20-bpy]2 is a type of eight-coordinated lanthanide carboxylate complexes containing 2,20-bpy. The {[Ho(2- FBA)3$2H2O]$(4,40-bpy)}n is in one-dimensional polymeric structure, and the 3D supramolecular network structure is formed by the hydrogen bonds and p–p stacking interactions. q 2005 Elsevier B.V. All rights reserved.