INFRA-RED SPECTRA OF COMPLEXES OF BERYLLIUM WITH TRI-N-OCTYLPHOSPHINE OXIDE AND DI(2-ETHYLHEXYL) PHOSPHORIC ACID

The interaction of beryllium with tri-n-octylphosphine oxide (TOPO) and with di(2-ethylhexyl) phosphoric acid (HDEHP) has been studied by i.r. spectroscopy. For beryllium nitrate -TOPO solutions, the small shift (48 cm-1) in vPO and the small splitting (195 cm-1) of the nitrate band in relation to the large ionic potential ( e r) of the beryllium ion are explained on the basis of steric hindrance. A similar situation is found in the aluminium nitrate-TOPO system. In the spectrum of Be(DEHP)2(HDEHP)2 a very broad band in the region 1700-800 cm-1 indicates the presence of strong, symmetrical or near-symmetrical hydrogen bonding. Be(DEHP)2 occurs at higher beryllium loadings and bands at 763 and 685 cm-1 are shown to be BeO vibrational modes. The system Fe3+-HDEHP shows similar features and studies have been made of the effect of deuteration and low temperatures on the spectrum of Fe(HEHP)3(HDEHP)3. © 1968.