The carbon NMR chemical shift tensors have been measured for solid samples of K-2[M(CN)(4)] (M = Zn, Cd, Hg) in which the cyano ligand is partially C-13 enriched. The symmetry at the carbon atom in each of these salts requires that the carbon chemical shift tenser be axially symmetric. The unique component of the tensors, which is along the M-C = N bond, was found to be the most shielded. The spans of the carbon chemical shift tensors were found to be very similar for the three complexes. On descending the group 12 metal cyanides, K-2[M(CN)(4)], from Zn to Hg, small increases in both the delta(perpendicular to) (C-13) and delta(parallel to)(C-13) components were observed. Magic-angle-spinning (MAS) Zn-67, Cd-113, and Hg-199 NMR spectra were obtained for K-2[Zn(CN)(4)], K-2[Cd(CN)(4)], and K-2[Hg(CN)(4)], respectively. The following values for (1)J(M,C) were found : (1)J(Zn-67, C-13)(iso), = 88 Hz, (1)J(Cd-113, C-13)(iso) = 575 Hz, and (1)J(Hg-199, C-13)(iso) = 1540 Hz. The measurement of (1)J(Zn-67, C-13)(iso) for solid K-2[Zn(CN)(4)] represents the first report of an indirect spin-spin (J) coupling constant involving Zn-67.