Synthesis and characterization of ruthenium, rhenium and titanium formate,acetate and trifluoroacetate complexes. Correlation of IR spectral properties and bonding types

New formate (1-3; 4b, 6 and 7), acetate (8, 9) and trifluoroacetate (12, 13 and 15) complexes have been synthesized and characterized by elemental ana lysis and by IR and H-1 and C-13 NMR spectroscopies. New data or new synthe tic procedures are provided for several known complexes (4a, 5, 19, 11 and 14). X-ray structural data for cis-Ru(bpy)(2)(CO)(OCHO)(PO2F2) (4b) clearly identify the eta(1)-bound formate ligand bound to an octahedral ruthenium center and the data for fac-Re(CO)(3)(PPh3(OCOMe) (9) show an eta(2)-bound acetate ligand bound to an octahedral rhenium center. Infrared spectral dat a for four types of formate complexes, three bonding types of acetates and the two known types of trifluoroacetate ligands are discussed. Comparisons of the v(OCO) bands for the carboxylate ligands in all of the complexes sho w that these bands are useful in identifying the bonding type of each carbo xylate ligand. (C) 1999 Elsevier Science Ltd. All rights reserved.