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High resolution vibrational spectra of the tetrahalogeno-closo-1,2-diphosphahexaboranes P 2 B 4 X 4 , X = Cl, Br have been measured at low temperatures (20 - 60 K). The boron-halogen stretching vibrations are observed below 370 cm -1  while the P-P valence vibrations are found at 414 (Cl) and 372 cm -1  (Br). Due to the presence of the boron isotopes  10 B and  11 B the P-P stretching vibrations and the cage modes in the region of 550 to 1200 cm -1  are split. Based on the crystallographic data of P 2 B 4 C 14  normal coordinate analyses have been performed. Using a set of 16 force constants (e.g. f d (PP) = 1.35 (X = Cl) and 1.20 (Br), f d (BB) = 1.30 / 1.65 (Cl) and 1.45 /1.60 (Br), f d (BX) = 4.40 (Cl) and 3.53 (Br) mdyn / Å) a good agreement of observed and calculated frequencies has been achieved.

zeitschrift für naturforschung b

Schwingungsspektren und Normalkoordinatenanalyse der Tetrahalogeno-closo-1,2-diphosphahexaborane P 2 B 4 X 4 , X = Cl, Br / Vibrational Spectra and Normal Coordinate Analysis of the Tetrahalogeno-closo-1,2-diphosphahexaboranes P 2 B 4 X 4 , X = Cl, Br