Single-chain magnet features in 1D [MnR4TPP][TCNE] compounds

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Abstract

Molecular chains of antiferrimagnetically coupled MnIII-ion (S = 2) and TCNE (tetracyanoethylene) radical moments (s = 1/2) show different behaviour depending on group R substituted to TPP (tetraphenylporphyrin) and on the substitution site. The compound with R = F in Ortho position is a Single-Chain Magnet (SCM) with blocking temperature Tb = 6.6K, while that with R = F in Meta position shows both blocking (Tb = 5.4 K) and magnetic ordering transition (Tc = 10 K). For bulky groups R = OCnH2n+1, the magnetically ordered phase is observed (Tc ≈ 22 K), which does not however prevent slow relaxation at T <8 K. Magnetic hysteresis with coercive field Hc of 2 T at 2.3 K is like that of SCM. The frequency dependent AC susceptibility in the superimposed DC field reveals common features of all systems. The energy of intrachain ferromagnetic coupling between effective spin units 3/2, relevant at low temperatures, is determined for all compounds and the interchain dipolar coupling is estimated. It is concluded that slow relaxation is inherent for all quasi one-dimensional compounds and for the magnetically ordered ones shows up in the high enough magnetic field.

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Bałanda, M., Tomkowicz, Z., Haase, W., & Rams, M. (2011). Single-chain magnet features in 1D [MnR4TPP][TCNE] compounds. In Journal of Physics: Conference Series (Vol. 303). Institute of Physics Publishing. https://doi.org/10.1088/1742-6596/303/1/012036

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