Thermal reactions of metal complexes under quasi-isothermal and -isobaric conditions. 3. Solid-phase thermal reactions of the doubly complexed salts of the forms [(Cr or Co)(NH3)6][(Cr or Co)(CN)6], [(Cr or Co)(H2O)(NH3)5][(Cr or Co)(CN)6], and cis-[(Co(H2O)2(NH3)4][Co(CN)6]