measurementsThe reactivity of molecules in solid state is known to be affectedby their environment. In contrast to a fluid state, in crystal latticeof ionic solids the anions and cations are settled at a relativelyfixed position and orientation, so that the mutual contacts andinteractions are restricted. Therefore, the effect of surrounding onkinetic and mechanism of solid state isomerization reactions couldbe elicited through changes in crystal structure and/or parameters(distortion of the cations, redistribution of the electron density,change in the vibrational frequencies and the free space aroundthe reacting ligands) [34]. However, previous investigation showedthat the linkage isomerization of above-mentioned nitro and nitritoisomers proceed via formation of solid solutions and at all timesduring isomerization the system remains monophasic and the mainstructural framework is preserved, but there are a continues dis-tortion in the whole of crystal structure [11]. Furthermore, crystalpacking, hydrogen bonding and flexibility of the reaction cavity arethe parameters that should be considered to provide a less ambigu-ous interpretation of the kinetic data of solid state isomerizationreaction.