Characterization of Tetracyanopyridine (TCNPy)-Based Magnets: V[TCNPy](2)center dot z(CH2Cl2) (T-c=111 K) and V[TCNPy](3)center dot z(CH2Cl2) (T-c=90 K)

摘要

The reaction of 2,3,5,6-tetracyanopyridine (TCNPy) with V(CO)(6) in CH2Cl2 forms new organic-based magnets of V[TCNPy](x)center dot z(CH2Cl2) (x=2,3) composition. Analysis of the IR spectra suggests that the TCNPy is reduced and coordinated to V-II sites through the nitriles. V[TCNPy](x) order as ferrimag-nets with 111 and 90 K T-c values for V[TCNPy](2) and V[TCNPy](3), respectively. Their respective remanent magnetizations and coercive fields are 1260 and 250 emuO mol(-1) and 9 and 6 Oe at 5 K, and they exhibit some spin-glass behavior.