Complexes based on ferrocenecarboxylate ligands: steric hindrance induced by ferrocenyl groups

Abstract

Three metal complexes with ferrocenecarboxylate ligands, [M₂(η ²-FcCOO)₂(μ₂-η ²-FcCONHCH₂COO)₂(phen)₂] · nH₂O [M = Pb, n = 6 (1) and M = Cd, n = 2 (2)] and [Cd(FcCONHCH₂COO)(μ₂-FcCONHCH₂COO)(2,2′-bipy)(H₂O)] _n (3) (FcCOOH = ferrocenemonocarboxylic acid, FcCONHCH₂COOH = N-ferrocenylformylglycine, phen = 1,10-phenanthroline, 2,2′-biby = 2,2′-bipyridine), were synthesized and characterized by elemental analysis, IR, and single crystal X-ray diffraction analysis. Structural studies revealed that 1 and 2 have similar binuclear structures, but 3 exhibits a 1-D chain structure. The difference in the structures of ferrocenylcarboxylate-containing cadmium(II) complexes is due to steric hindrance of ferrocenyl groups.

Keywords:

• Ferrocenecarboxylate
• Steric hindrance effect
• Complex
• Crystal structure

Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 20971029) and the Guangxi Natural Science Foundation (No. 2010GXNSFD013018 and 2010GXNSFF013001).