Abstract
AbstractA new 2,5‐bis(1,3‐dithiol‐2‐ylidene)‐1,3,4,6‐tetrathiapentalene (BDT‐TTP) type donor, 2‐(4,5‐dimethoxy‐1,3‐dithiol‐2‐ylidene)‐5‐(4,5‐ethylenedithio‐1,3‐dithiol‐2‐ylidene)‐1,3,4,6‐tetrathiapentalene (MOET‐TTP) was synthesized and its magnetic and non‐magnetic anion salts (MOET‐TTP)2MCl4 (M = Fe and Ga), were prepared. These salts are isostructural and belong to the space group of P1. They show metal‐like behavior down to 200 K for the FeCl4 salt and 20 K for the GaCl4 salt. The band structures of these salts are two‐dimensional. The MCl4 anions are located between the donor columns and close to the ethylenedithio and methoxy groups of the donor molecules. The magnetic susceptibilities of the FeCl4 salts follow the Curie–Weiss law with Curie constant of 4.3 emu K mol−1 and Weiss temperature of θ = −1.8 K, revealing a weak antiferromagnetic interaction of 3d spins of the FeCl4 anions. The ${\rm Fe}\cdots {\rm Fe}$ (6.508(3) Å) and ${\rm Cl}\cdots {\rm Cl}$ (3.78–4.69 Å) distances in the crystal structure of the salt are significantly long. Therefore, the direct magnetic interaction between the 3d spins of the nearest neighboring Fe3+ ions does not seem readily accessible.
Published Version
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