Selective Redox-Active Molecular Receptors for K+ and Ag+
摘要:
Two new tetrathiafulvalene based receptors in which the favorable redox properties of the tetrathiafulvalene unit are coupled to either a benzo-crown (X = O) or a dithlabenzo-crown (X = S) ether binding site were designed and synthesized as receptors for K+ and Ag+. The receptors display a good (K+, X = O) to strong (Ag+, X = S) affinity toward the cation and a high discrimination against other metal cations.
Selective Redox-Active Molecular Receptors for K<sup>+</sup> and Ag<sup>+</sup>
作者:Karina R. Larsen、Carsten Johnsen、Ole Hammerich、Jan O. Jeppesen
DOI:10.1021/ol303308e
日期:2013.4.5
Two new tetrathiafulvalene based receptors in which the favorable redox properties of the tetrathiafulvalene unit are coupled to either a benzo-crown (X = O) or a dithlabenzo-crown (X = S) ether binding site were designed and synthesized as receptors for K+ and Ag+. The receptors display a good (K+, X = O) to strong (Ag+, X = S) affinity toward the cation and a high discrimination against other metal cations.
Robust Inclusion Complexes of Crown Ether Fused Tetrathiafulvalenes with Li
<sup>+</sup>
@C
<sub>60</sub>
to Afford Efficient Photodriven Charge Separation
作者:Mustafa Supur、Yuki Kawashima、Karina R. Larsen、Kei Ohkubo、Jan O. Jeppesen、Shunichi Fukuzumi
DOI:10.1002/chem.201402449
日期:2014.10.20
dithiabenzo‐crownetherfunctionalized monopyrrolotetrathiafulvalene (MPTTF) molecules were formed with Li+@C60 (1⋅Li+@C60 and 2⋅Li+@C60). The strong complexation has been quantified by high binding constants that exceed 106 M−1 obtained by UV/Vis titrations in benzonitrile (PhCN) at room temperature. On the basis of DFT studies at the B3LYP/6‐311G(d,p) level, the orbital interactions between the crown ether
苯并和dithiabenzo冠醚官能monopyrrolotetrathiafulvalene的包合配合物(MPTTF)分子用形成李+ @C 60(1⋅栗+ @C 60和2⋅栗+ @C 60)。通过在室温下在苄腈(PhCN)中通过UV / Vis滴定获得的超过10 6 M -1的高结合常数,可以量化强络合作用。根据B3LYP / 6-311G(d,p)水平的DFT研究,冠醚部分与富勒烯π表面以及内膜Li +之间的轨道相互作用在稳固的复合物形成中起关键作用。有趣的是,Li + @ C 60与冠醚的络合加速了配合物光激发时的体系间穿越,从而在没有通过1 Li + @ C 60 *进行电荷分离的情况下产生3(Li + @C 60)* 。借助于光诱导电荷分离3栗+ @C 60 *以135的寿命和120微秒为1⋅栗+ @C 60和2⋅栗+ @C 60分别通过时间分辨瞬态吸收光谱法在PhCN中观察到了0