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首页> 外文期刊>Organometallics >Stabilization of the (pound)-1-Ferrocenyl-2-(1-methyl-4-pyridinium)ethylene Cation by Inclusion in Cucurbit[7]uril
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Stabilization of the (pound)-1-Ferrocenyl-2-(1-methyl-4-pyridinium)ethylene Cation by Inclusion in Cucurbit[7]uril

机译:通过包裹在葫芦丝中来稳定(磅)-1-二茂铁基-2-(1-甲基-4-吡啶)亚乙基阳离子[7]

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摘要

The (E)-1-ferrocenyl-2-(1-methyl-4-pyridinium)eth-ylene cation,(E)-FcMPE~+,forms a very stable guest-host complex ( K_(CB7)= (1.3 +- 0.5) x 10~(12) M~(-1)) in aqueous solution with cucurbit[7]uril (CB[7]).The ~1H NMR,ES-MS,and UV-visible spectra are consistent with 1:1 {(E)-FcMPE centre dot CB[7]}~+ species formation,in which the CB[7] encapsulates the ferro-cenylethylene portion of the guest.The reduction potential of the (E)-FcMPE~(2+/+) couple increases slightly (+0.03 V) in the presence of CB[7],while the rate constant for the oxidation of (E)-FcMPE~+ by Co(dipic)_2~- (dipic~(2-) = 2,6-pyridinedicarboxy-late) decreases significantly.UV-visible spectra of (E)-Fc-MPE~+ in the absence and in the presence of CB[7] during photoirradiation demonstrate that the photoisomerization to (Z)-FcMPE~+ is fully inhibited and photo stabilization of ( E)-FcMPE~+ is dramatically enhanced upon inclusion in CB[7].
机译:(E)-1-二茂铁基-2-(1-甲基-4-吡啶基)乙撑阳离子(E)-FcMPE〜+形成非常稳定的客体-主体配合物(K_(CB7)=(1.3 + -含葫芦[7]尿素(CB [7])的水溶液中的0.5)x 10〜(12)M〜(-1))。〜1H NMR,ES-MS和紫外可见光谱与1相符:1 {(E)-FcMPE中心点CB [7]}〜+物种的形成,其中CB [7]包裹客体的亚铁-乙烯基乙烯部分。(E)-FcMPE〜(2 CB [7]存在时,+ / +)对略有增加(+0.03 V),而Co(dipic)_2〜-(dipic〜(2-)氧化(E)-FcMPE〜+的速率常数)= 2,6-吡啶二羧酸酯)显着降低。(E)-Fc-MPE〜+在无或有CB存在下的紫外可见光谱[7]显示光异构化为(Z)- FcMPE〜+被完全抑制后,(E)-FcMPE〜+的光稳定性在加入CB后会显着增强[7]。

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