Manganese(II) octabutoxynaphthalocyanine and its ferrimagnetic electron-transfer salt with TCNE

The magnetic susceptibility (χ) of 1,6,10,15,19,25,28,32-octa-n-butoxynaphthalocyaninatomanganese(III) tetra-cyanoethanide can be fit to a Curie–Weiss expression with θ = 54 K for T > 150 K, and the χT(T) data are con-sistent with linear chains and can be fit to a Seiden expression for alternating S = 2 and S = 1/2 anti-ferromagnetically coupled spin sites with a coupling constant, Jintra/kB (H = −2JSa·Sb) of −145 K. Hysteresis with a coercive field of 1.6 kOe was observed at 2 K. The magnetic ordering temperature, Tc, determined from both the maximum in the 10 Hz ac susceptibility, χ′(T), and the irreversibility of low field zero field cooled/field cooled magnetization data, was determined to be 9.0 K. This is the first example of a metallophthalocyanine electron transfer salt that magnetically orders.