共查询到20条相似文献，搜索用时 15 毫秒
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(33):9974-9978
From DNA base pairs to drug–receptor binding, hydrogen (H‐)bonding and aromaticity are common features of heterocycles. Herein, the interplay of these bonding aspects is explored. H‐bond strength modulation due to enhancement or disruption of aromaticity of heterocycles is experimentally revealed by comparing homodimer H‐bond energies of aromatic heterocycles with analogs that have the same H‐bonding moieties but lack cyclic π‐conjugation. NMR studies of dimerization in C6D6 find aromaticity‐modulated H‐bonding (AMHB) energy effects of approximately ±30 %, depending on whether they enhance or weaken aromatic delocalization. The attendant ring current perturbations expected from such modulation are confirmed by chemical shift changes in both observed ring C−H and calculated nucleus‐independent sites. In silico modeling confirms that AMHB effects outweigh those of hybridization or dipole–dipole interaction. 相似文献
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Claudia Hbartner Scott&#x;K. Silverman 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2007,119(39):7564-7568
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Dae‐Wi Yoon Hoon Hwang Chang‐Hee Lee 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2002,114(10):1835-1837
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(42):13263-13267
The acid–base switching of complexes formed from anti‐electrostatic anion–anion homodimers of organophosphates and cyanostar macrocycles was investigated for the first time. High‐fidelity 2:2 complexes were selected by using suitably sized organo substituents. Reversible and direct switching occurs with triflic acid and hydroxide base. An unexpected acid⋅⋅⋅anion heterodimer was discovered with weaker picric acid, which helped reveal some of the elementary steps. Switching can also proceed in a cooperative (strong anion then weak acid) or stepwise manner (weak acid then strong anion). 相似文献
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Shunsuke Oishi Susumu Saito 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2012,124(22):5491-5495
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Mirko Bauer Stefan Spange 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2011,123(41):9901-9904