Ab initio electronic structure theory has been used to characterize the lowest singlet A'' excited state of isocyanogen. The geometries, vibrational frequencies, and infrared intensities of the X ¹Sigma⁺ and A ¹A'' states have been determined using the single and double excitation configuration-interaction (CISD) method in conjunction with a triple-zeta plus double polarization (TZ2P) basis set. Adding the Davidson correction and including a set of f polarization functions in the basis set (CISD+Q TZ2Pf), we estimate the energy difference between the ground and first excited singlet state of isocyanogen to be T_e = 41,700 cm^-1. With a C-N-C bond angle of 117 degrees, this bent singlet A'' excited state may be useful in stimulated emission pumping (SEP) experiments on the NCCN <--> CNCN isomerization.