Infrared Spectra of Diacetylene-Hydrogen Fluoride Complexes in Solid Argon

Article abstract of DOI:10.1021/j100408a017

Diacetylene-hydrogen fluoride complexes and their deuterated counterparts have been characterized in solid argon at 10 K by infrared spectroscopy.The observation of two new sets of H-F stretching, C-H stretching, and C-H bending absorptions indicates that two primary product 1:1 complexes were trapped in the matrix.These absorption bands characterize a C4H2--HF ? complex and a C4H2--FH ? complex whose relative yields exhibit a deuterium substitution dependence consistent with a preference for deuterium in the bonding position.The relative values of the ν_s (H-F stretching) and ν1 (H-F librational) modes for the diacetylene--HF and acetylene--HF ? complexes reveal weaker hydrogen bonding in the diacetylene--HF complex.Annealing produced comparable increased yields of both 1:1 complexes, suggesting combarable stabilities, and a marked increase in a C4H2--(HF)2 complex.