Abstract
Abstract (TTP-PROXYL)FeCl4, where TTP-PROXYL is 2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene (TTP) incorporating the 2,2,5,5-tetramethyl-1-pyrrolidinyloxy (PROXYL) radical, is a semiconductor with two kinds of localized spin systems, that is, the systems of organic radical spins and 3d spins of magnetic FeCl4− ions. The π spin of the TTP-PROXYL radical cation disappears due to dimerization but the χT-value of 4.65 K emu mol−1 indicates the coexistence of high-spin Fe3+ (S = 5/2) and PROXYL radical (S = 1/2) in this salt. (TTP-PROXYL)GaCl4 is isostructural to the FeCl4 salt and exhibited similar semiconducting properties.
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