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Rotational spectra of seven isotopomers of the weakly bound complex NeCO2, i.e., NeCO2,22NeCO2, Ne13CO2,22Ne13CO2, Ne18O13CO, Ne17OCO, and22Ne17OCO, were measured using a pulsed molecular beam Fourier transform microwave spectrometer. Rotational and centrifugal distortion constants as well as the nuclear quadrupole coupling constants of17O in Ne17OCO and22Ne17OCO were determined. The obtained constants were used to derive structural and force field information. The parameters obtained are discussed, and compared with those of other, previously measured, rare gas–CO2complexes. The17O nuclear quadrupole coupling constants were analyzed and interpreted in terms of the angular anisotropy of the intermolecular potential energy surface.