I. Synthesis and spectroscopic characterization of poly(bis(cyclopentadienyl)titanium(IV) squarate);. II. Reaction of the tetrachloroplatinate (II) ion with the basic trifunctional amino acids

Reaction of Cp2TiCl2 with the dianion of squaric acid yields a polymer in which the squarate ion is present as a simple bidentate ligand with two uncoordinated carbonyl groups. The polymeric structure was established using light scattering photometry and geometric arguments. The structure and bonding of the polymer was confirmed using infrared, Raman, and 1H-NMR spectroscopy, and mass spectrometry. The 1H-NMR spectrum of the polymer shows two complex multiplets for the cyclopentadienyl rings, and indicates inhibition of rotation of the Cp rings. Reaction of the tetrachloroplatinate ion with lysine, arginine, and histidine, using 1:1 ligand to metal ratios was investigated. The amino acids used were in the cationic, anionic and zwitterionic forms. The structures of the products obtained were investigated using infrared spectroscopy, light scattering photometry, 1H-NMR spectroscopy and mass spectrometry. Preliminary biological studies were conducted on the histidine products.