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首页> 美国政府科技报告 >New ambient pressure organic superconductors: alpha-(BEDT-TTF)(sub 2)(NH(sub 4))Hg(SCN)(sub 4), beta m-(BEDO-TTF)(sub 3)Cu(sub 2)(NCS)(sub 3), and kappa-(BEDT-TTF)(sub 2)Cu(N(CN)(sub 2))Br.
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New ambient pressure organic superconductors: alpha-(BEDT-TTF)(sub 2)(NH(sub 4))Hg(SCN)(sub 4), beta m-(BEDO-TTF)(sub 3)Cu(sub 2)(NCS)(sub 3), and kappa-(BEDT-TTF)(sub 2)Cu(N(CN)(sub 2))Br.

机译：新的环境压力有机超导体：α-（BEDT-TTF）（sub 2）（NH（sub 4））Hg（sCN）（sub 4），beta m-（BEDO-TTF）（sub 3）Cu（sub 2） （NCs）（sub 3）和kappa（BEDT-TTF）（sub 2）Cu（N（CN）（sub 2））Br。

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More than one hundred and twenty conducting salts based on the organic donor-molecule BEDT-TTF are known, where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene (abbreviated herein as ET). Several of the early salts possessed tetrahedral and octahedral anions, such as (ET)(sub 2)ClO(sub 4)(TCE), (ET)(sub 2)PF(sub 6), (ET)(sub 2)ReO(sub 4), and (ET)(sub 2)BrO(sub 4). The perchlorate salt is metallic to 1.4 K,(sup 1) and the perrenate derivative was the first ET based organic superconductor ((Tc) 2 K, 4.5 kbar). Since the discovery of ambient pressure superconductivity in (beta)-(ET)(sub 2)I(sub 3) ((Tc) 1.4 K),(sup 5) other isostructural (beta)-(ET)(sub 2)X salts have been prepared with higher (Tc)'s. A structure-property correlation for the (beta)-type salts has been reviewed in this volume; it predicts that (Tc)'s higher than 8K are possible if (beta)-salts with linear anions longer than I(sub 3)(sup (minus)) can be synthesized. During the search for new linear anions, a variety of compounds with discovered with polymeric anions. The report of superconductivity in (kappa)-(ET)(sub 4)Hg(sub 3)X(sub 8) (X = Cl, (Tc) 5.4 K 29 kbar and X = Br, (Tc) 4.3 K ambient pressure and 6.7 K 3.5 kbar) and (kappa)-(ET)(sub 2)Cu(NCS)(sub 2) ((Tc) 10.4 K) further stimulated the search for novel polymeric anions. A general synthetic strategy for preparing new salts containing polymeric anions is to couple a coordinatively unsaturated neutral transition metal halide/pseudohalide with a simple halide or pseudohalide during an electrocrystallization synthesis. In this article, the authors discuss three new ambient pressure organic superconductors with novel polymeric anions, (alpha)-(ET)(sub 2)(NH(sub 4))Hg(SCN)(sub 4), (beta)m-(BO)(sub 3)Cu(sub 2)(NCS)(sub 3) and (kappa)-(ET)(sub 2)Cu(N(CN)(sub 2))Br. 48 refs., 8 figs., 2 tabs.

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