The C-F•••F-C short contacts in the metal complexes of fluoro-phenyl-acrylic acids

Four new complexes of fluoro-phenyl-acrylic acids (E)-3-(3-fluoro-phenyl)-acrylic acid (L1) [Mn-3(L1)(6)(L2)(2)]center dot H2O center dot CH3CN (1), [Zn-2(L1)(4)(L3)](n) (2), [Mn(L1)(2)(H2O)(2)](n). (3) and [Co(L1)(2)(H2O)(2)](n) (4) (L2=1,10-phenanthroline, L3=4,4'-bipy) have been synthesized based on the molecular design and research of halogen-halogen interactions (especially fluoro-fluoro contact). The structure analyses reveal that complex 1 is a trinuclear complex, which is blocked by U. Complex 2 is a 1D chain bridged through L3. Complexes 3 and 4 exhibit 2D grid like metal-organic framework structures through carboxylato bridge ligand. Variable-temperature magnetic measurements showed an antiferromagnetic interaction between Mn(11) ions and between Co(II) ions in complexes 3 and 4, respectively. A short C- F center dot center dot center dot F -C contact with a distance of 2.953 angstrom was found between the trinuclear coordination compound 1. (C) 2010 Elsevier Inc. All rights reserved.