Pressure dependent magnetic behavior of 1D ferrimagnetic meso-tetrakis((4-chlorophenyl)porphyrinato)manganese(III) tetracyanoethenide, [MnIIITClPP]+[TCNE]-

Abstract The pressure dependent magnetic behavior of β -[Mn III TClPP] + [TCNE] − {MnTClPP = (4-tetrakis(4-chlorophenyl)porphyrinato)manganese(III); TCNE = tetracyanoethylene} and [Mn III TClPP] + [TCNE] − ·2PhMe up to 7.51 and 10.66 kbar, respectively, was determined. The T c ( P ) for non-solvated β -[MnTClPP][TCNE] reversibly increases with applied pressure by 50% from 5.4 K at ambient pressure to 8.1 K at 7.51 kbar at an average rate of 0.36 K/kbar. This is attributed to reduction of the intrachain Mn⋯Mn separation, the Mn–N–C angle, and the dihedral angle between the MnN 4 and [TCNE] − mean planes increasing the intra- and interchain interactions. Solvated [Mn III TClPP] + [TCNE] − ·2PhMe, likewise, has an initial increase in T c with applied pressure, but irreversible behavior is evident and this is attributed to the irreversible loss of solvent from the lattice. The increasing T c ( P ) with applied pressure differs from previous results reported for related substituted tetraphenylporphyrin manganese(III) TCNE compounds.