We report our observations of 63,65Cu, 35,37Cl, 79,81Br and 85,87Rb NQR in the quasi 1-D compounds CuBr 2, CuCl 2, CsCuCl 3, CsCuBr 3 and RbCuCl 3 between 77 and 295 K. The Cu resonance in CuBr 2 was observed to disappear Sharply at 82 K, although the Br resonance remained down to 77 K, which is interpreted as heralding the onset of a phase change to the antiferromagnetic (AF) state just below 77 K. This is supported by a rough estimate of T N = 77 K obtained by scaling the known AF transition in CuCl 2 at 23.9 K in the ratio of the temperatures, 70 and 226 K respectively, at which CuCl 2 and CuBr 2 exhibit maxima in magnetic susceptibility. Pressure and temperature dependence data for 63Cu NQR in CuBr 2 and CsCuCl 3 respectively, are also reported. It is speculated that the exchange narrowing that permits observation of Cu NQR in these Cu 2+ (S= 1 2 ) compounds is linked to their particular type of 1-D halogen bridged structure. Other compounds of the form MCuCl 3 and M 2CuCl 4 characterized by dimer pair Cu 2Cl 2− 6 and discrete molecule CuCl 2− 4 arrangements were examined unsuccessfully for Cu resonances although chlorine NQR was observed in each case. The RbCuCl 3CA) structure (2 Cu sites) appears to be a marginal structure type with a structural phase change at 261 K above which the Cu signals disappeared although Cl NQR was still observed.