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), 2,2′-bipydine (2,2′-bpy) and 4,4′-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)3·2,2′-bpy]2 is a type of eight-coordinated lanthanide carboxylate complexes containing 2,2′-bpy. The {[Ho(2-FBA)3·2H2O]·(4,4′-bpy)}n is in one-dimensional polymeric structure, and the 3D supramolecular network structure is formed by the hydrogen bonds and π-π stacking interactions.