Ab initio calculations were performed at the B3LYP, MP2 and QCISD levels of theory using the 6-311++G(3df,2pd) basis set to obtain optimized geometries, dipole moments, binding energies and harmonic vibrational frequencies
for the symmetrical T-shaped structures of XH···π bonded complexes involving acetylene (as the proton acceptor) and the halides HF, HCl and HBr (as the proton donors). The relative stabilities of the D-containing
isotopomers C2H2···DX and C2HD···HX were also determined from their zero-point energies; vibrational frequency shifts of HX and acetylene on bonding were also calculated and used to gain insight into these relative
stabilities. It was found that the D-bonded isotopomer (C2H2···DX) was more thermodynamically stable than the H-bonded isotopomer (C2HD···HX) for HF-, HCl- and HBr-containing complexes; previous studies on the weakly bound linear complexes CO–acetylene and N2–acetylene also found that the D-bonded species was more stable than the H-bonded species.
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