Infrared Spectra of 1:10 Phenanthroline and its Addition Compounds with Antimony Trichloride and Antimony Pentachloride

Addition compounds of 1 : 1 0 phenanthroline are not reported earlier although it is known to posses electron donating properties. The present work reports the preparation and infrared spectra of the adducts of 1 : 1 0 phenanthroline with SbCl3 and SbCl5 . The IR spectra were recorded in the medium infrared region (4000 to 650 c m 1 ) with a view to understand the changes in the vibrational spectrum that the 1 : 1 0 phenanthroline molecule undergoes on co-ordination. The adducts were prepared by mixing accurately weighed amounts in 1 : 1 ratio of the base and antimony halide dissolved in dried distilled benzene. 1 : 1 0 phenanthroline was a GR grade E. Merck product. Antimony pentachloride was a Riedel product. Antimony trichloride was a LR grade BDH product. All the operations were carried out under vacuum and anhydrous conditions. Analytical data are listed in Table 1.