One of the first thionitrosyl complexes to be reported was This compound has carbonyl ba...

One of the first thionitrosyl complexes to be reported was This compound has carbonyl bands at 1962 and 2033 cm^-1. The corresponding bands for are at 1955 and 2028 cm^-1. On the basis of the IR evidence, is NS behaving as a stronger or weaker p acceptor in these compounds? Explain briefly. (See T. . Greenough, B. W. S. Kolthammer, P. Legzdins, J. Trotter, Chem. Commun. , 1978 , 1036.)