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

The pressure dependent magnetic behavior of β-[MnIIITClPP]+[TCNE]− {MnTClPP = (4-tetrakis(4-chlorophenyl)porphyrinato)manganese(III); TCNE = tetracyanoethylene} and [MnIIITClPP]+[TCNE]−·2PhMe up to 7.51 and 10.66 kbar, respectively, was determined. The Tc(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 MnN4 and [TCNE]− mean planes increasing the intra- and interchain interactions. Solvated [MnIIITClPP]+[TCNE]−·2PhMe, likewise, has an initial increase in Tc with applied pressure, but irreversible behavior is evident and this is attributed to the irreversible loss of solvent from the lattice. The increasing Tc(P) with applied pressure differs from previous results reported for related substituted tetraphenylporphyrin manganese(III) TCNE compounds.

Graphical abstractThe magnetic ordering temperature, Tc, reversibly increases by 50% between ambient pressure and 7.51 kbar for [MnTClPP][TCNE] {MnTClPP = meso-tetrakis((4-chlorophenyl)porphyrinato)-manganese(III)]; TCNE = tetracyanoethylene}. This continuous increase differs from that reported for related compounds.Figure optionsDownload full-size imageDownload as PowerPoint slide