Temperature induced spin crossover behaviour in mononuclear cobalt(II) bis terpyridine complexes

Dicationic cobalt(II) complexes of the type [Co(fterpy)(2)]c(X)(2)center dot nH(2)O center dot mCH(3)OH (fterpy = 4'-(2-furyl)-2,2':6',2 ''-terpyridine: 1: X = PF6-, n = 1.5, In = 0; 2: X = ClO4-, n =1, m = 1) have been isolated using self-assembly method and characterized by various spectroscopic techniques. In crystalline states both compounds exhibit gradual and incomplete spin crossover (SCO) behaviour in the temperature range 2-320 K. Various spin states of cobalt(II) in 1 have been confirmed by crystallographic evidences at 150 K and 293 K. A variation in counter anions and solvent molecules from 1 to 2 substantially improves the cooperativily among the spin active metal centres and thereby changing the nature of SCO behaviour.