Modulation of charge-transfer complexes assisted by complementary hydrogen bonds of nucleobases: TCNQ complexes of a uracil-substituted EDO-TTF
作者:Tsuyoshi Murata、Yoshikazu Umemoto、Eigo Miyazaki、Kazuhiro Nakasuji、Yasushi Morita
DOI:10.1039/c2ce25889g
日期:——
A hydrogen bond functionalized ethylenedioxytetrathiafulvalene (EDO-TTF) derivative having an n-butyluracil moiety was synthesized. In the crystal structure, the Watson–Crick-type complementary hydrogen bonds of the uracil moiety formed a pair of donor molecules, which further aggregated by S⋯S interactions and π-stacks of the TTF moiety to construct a two-dimensional sheet. In the charge-transfer complex formation with tetracyanoquinodimethane, the crystallization conditions modulated the subtle balance between Watson–Crick and reverse Watson–Crick types of complementary hydrogen-bonded pairs, controlling stoichiometry, ionicity and molecular packing of the complexes. A highly conducting mixed valence complex with the Watson–Crick-type hydrogen bonds was yielded by the quick evaporation of reaction solvent, and a low-conducting neutral complex forming reverse Watson–Crick-type hydrogen bonds was obtained by the slow vapor diffusion method.
我们合成了一种具有正丁基尿嘧啶分子的氢键功能化亚乙二氧基四硫杂戊烯(EDO-TTF)衍生物。在晶体结构中,尿嘧啶分子的沃森-克里基型互补氢键形成了一对供体分子,这对供体分子通过 S⋯S 相互作用和 TTF 分子的 π 叠进一步聚集,构建了一个二维薄片。在与四氰醌二甲烷形成电荷转移复合物的过程中,结晶条件调节了互补氢键对的沃森-克里克和反沃森-克里克类型之间的微妙平衡,从而控制了复合物的化学计量、离子性和分子堆积。通过快速蒸发反应溶剂,得到了具有沃森-克里克型氢键的高传导性混价配合物;通过缓慢的蒸汽扩散法,得到了形成反向沃森-克里克型氢键的低传导性中性配合物。