TheJ=1rarr;2 pure rotational transitions in the linear molecules HCCCl35, HCCCl37, DCCCl35, and DCCCl37have been observed using a Stark modulation microwave spectrograph. The expected quadrupole hyperfine structure has been observed and analyzed in the usual manner, yielding values for the nuclear quadrupole coupling constants of minus;79.67, minus;62.75, minus;79.66, and minus;63.12 (mc) respectively. The observed Stark effect is in good agreement with that calculated for a linear molecule with a single quadrupolar nucleus using the previously reported value of 0.44 Delsye unit for the dipole moment. The dipole moment calculated from the Stark Effect data is 0.44plusmn;0.01 D. Bond distances calculated are Hsngbnd;C=1.052plusmn;0.001A, Ctrpbnd;C=1.211plusmn;0.001A, and Csngbnd;Cl=1.632plusmn;0.001A.
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