The reactivity of molecules in solid state is known to be affected by their environment. In contrast to a fluid state, in crystal lattice of ionic solids the anions and cations are settled at a relatively fixed position and orientation, so that the mutual contacts and interactions are restricted. Therefore, the effect of surrounding on kinetic 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 times during 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, crystal packing, hydrogen bonding and flexibility of the reaction cavity are the parameters that should be considered to provide a less ambigu-ous interpretation of the kinetic data of solid state isomerization reaction.