Laser-ablated chromium atoms have been reacted with NO molecules during condensation in excess argon. Absorptions due to NCrO (976.1, 866.2 cm(-1)), Cr-eta(1)-NO (1614.3, 541.1 cm(-1)), and Cr-eta(2)-NO (1108.8, 528.2,478.0 cm(-1)) are observed and identified via isotopic substitution and DFT frequency calculations. The insertion reaction to give the more stable NCrO product requires activation energy, while the addition products Cr-eta(1)-NO and Cr-eta(2)-NO can be formed on diffusion of cold reagents in solid argon. Higher nitrosyls are also formed on annealing. On the basis of isotopic multiplets, a 1623.3 cm(-1) absorption is assigned to Cr-(eta(1)-NO)(2), a 1663.5 cm(-1) absorption to Cr-(eta(1)-NO)(3), and absorptions at 1726.0, 663.0, and 506.1 cm(-1) are assigned to Cr-(eta(1)-NO)(4). Evidence is also presented for the Cr-(eta(1)-NO)(x)(-) anions (x = 1, 2, 3) absorbing 100-160 cm(-1) lower than the neutral nitrosyl counterparts. In addition, NO complexes with CrO and CrO2 are also observed.