“…20%, the remaining 80% comprising the unchanged ground state structure. 9 The photochemically activated interconversion modes between the two metastable species, MS1 and MS2, proposed as a result of the spectroscopic studies, carried out at 25 K, are illustrated in Scheme 1. 7,8 This isomer had previously been reported as metastable state 2, MS2, by Johnson and Dew 9 from spectroscopic studies, in which a second metastable isomer, MS1, was also identified at a temperature of 25 K. For MS1 the bonding mode was not identified unambiguously but it was proposed that it might involve an g 1 -OSO coordination.…”