The study of three kinds of non-tetrathiafulvalene (TTF) donors, 2,5-bis(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene (BDA), 2,5-bis(1,3-dithiolan-2-ylidene)-1,3,4,6-tetrathiapentalene (BDH), and. 2-(1,3-dithiolan-2-ylidene)-5(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene (DHDA), which contain the bis-fused 1,3-dithiole-2-ylidene unit instead of the TTF unit as a pi-electron system, has been undertaken to develop new molecular-based organic superconductors, magnetic conductors, and organic metals. The BDA donor produces the superconducting SbF6, AsF6, and PF6 salts. ne kappa-(BDH)(2)FeCl4 salt is a paramagnetic organic metal stable down to 1.5 K, whereas beta-(BDA)2FeCl4 exhibits metallic conducting behavior with a sharp metal-to-insulator (MI) transition (T-MI = 113 K), and antiferromagnetic ordering with a Neel temperature of near 8.5 K. Several salts of DHDA, a hybrid of BDA and BDH, are found to be metallic.