232. Complexes of boron trichloride with pyridine and piperidine

Preparation, reactions, and characterization of trichloroselenium(IV) and trichlorotellurium(IV) sulfonates: SeCl3(XSO3) and TeCl3(XSO3) with X = CF3, CH3, and p-CH3C6H4

“…These complexes are insoluble in all common organic solvents. Their ir spectra are very complex due to a large number of bands for coordinated pyridine (19). However, bands at 1285, 1030, and 640 cm-' and 1240 and 1 160 cm-' , which are present in the spectrum of SeC13(CF3S03).2C5H5N (Table 3) and assigned to S-0 and C-F stretching modes respectively, are in close agreement with the corresponding bands observed for ionic CF3S03-(10, 1 I).…”

Investigation on Spectroscopic, Thermal and Antimicrobial Activity of Newly Synthesized Binuclear Cr(III) Metal Ion Complex

“…There was also a C-O single bond band at 1215 cm -1 and the υ(C=O) band at 1705 cm -1 . The spectra of free 2-picoline shows band at 1693 cm -1 assigned to υ(C=N) [20]. The complex displays bands at 1563 cm -1 and 1600 cm -1 due to υ sym (C=O) and υ asy (C-O) respectively, significantly lower than those of free diphenylacetic acid indicating the coordination of acid through its carboxylate anions.…”

Studies on the Pyrazine Complexes of Some Diaryltellurium Dihalides

“…Several modes of pyrazinein complexes have upward shift in wave number in comparison with those of free pyrazine. This blue shift in pyrazine bands in the complexes indicates the coordination through n-atom as in pyridine 12,13 . This blue shift in ppyrazine stretching may be due to back bonding from tellurium to pyrazine ring through formation of extensive -bonding.…”