Langmuir-blodgett superconductors based on C/sub 60/, new donor-acceptor systems, and a new conducting polymer$

Summary form only given. Pure C/sub 60/ forms Langmuir-Blodgett (LB) multilayers [1]; a hysteretic low-field signal in an EPR spectrometer in a K-doped 50-layer LB multilayer of C/sub 60/ appears at or below 8.1 K, due to flux exclusion by K/sub 3/C/sub 60/ (superconductivity): this is the first LB film superconductor [2]. The crystal structure of BDMT-TTeF (1) With C/sub 60/ and a molecule of CS/sub 2/, an insulator, has been determined [3]. Other donors, such as DTDAF (2), form a 1:1 insulating and a 2:5 semiconducting (0.01 S/cm) complex with TCNQ, with evidence for TCNQ-- dianions in the solid state [4]. A conducting polymer, poly-(naphtho-[2,3 c]thiophene-alt-bithiophene) (3) has a band gap of only 0.65 eV, and a conductivity of 0.002 S/cm [5]