Formula: C12H12N2In 2019 ,《Optimisation of octahedral iron(II) and cobalt(II) spin-crossover metal complex for thermoelectric application》 appeared in Materials Chemistry and Physics. The author of the article were Ibrahim, N. M. J. N.; Said, S. M.; Hasnan, M. M. I. M.; Sabri, M. F. M.; Abdullah, N.; Mainal, A.; Salleh, M. F. M.; Izam, T. F. T. M. N.. The article conveys some information:
Four spin-crossover (SCO) complexes with general formulas, [M2(CH3COO)4(L)2] and [M(L)3](BF4)2, where M = Fe(II) and Co(II), containing extended π-conjugated bipyridyl ligand and N3-Schiff bases appended with linear C16 carbon chains at the N atoms were successfully synthesized and characterized. Correlation of its structural properties to thermoelec. behavior was studied: (1)structure of complexes, (2)choice of metal center and (3)choice of counterions. The structure of the mol., i.e. mol. vs. ionic has the largest impact on the SCO behavior. The mol. complexes with higher percentage of high-spin (73.4% HS for Fe-dinuc and 78% HS for Co-dinuc) produced the highest Seebeck values in mV K-1 (-0.57 ± 0.01 for Fe-dinuc and -0.58 ± 0.01 for Co-dinuc) due to the weaker metal-to-ligand bonds resulting in the increase mobility of the I- during agglomeration formed, thus increased the entropy in the solution Addnl., choice of metal center also was a factor to determine the magnitude of Seebeck performance due to the spin state transition during electron transfer. For counterion effect, it has the effect of determining the sign of the Seebeck value where I- is easier to oxidize/reduce process compared to CH3COO- and BF4- due to lower redox potential. These findings will assist in a systematic mol. design pathway for high potential SCO complexes for thermoelec. applications. In addition to this study using 4,4′-Dimethyl-2,2′-bipyridine, there are many other studies that have used 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6Formula: C12H12N2) was used in this study.
4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6) is used in the synthesis of a series of o-phenanthroline-substituted ruthenium(II) complexes.Formula: C12H12N2 Furthermore, 4,4′-Dimethyl-2,2′-bipyridine is used as a chemical Intermediate. It can be used for the determination of ferrous and cyanide compounds.