Too hot to handle: Unprecedented affinity and specificity for ⁹⁹TcO₄⁻ in aqueous solution was shown with the p‐xylyl azacryptand in the hexaprotonated form (see scheme). A crystal structure of the complex reveals how the anion fits within the cavity of the cage, and the formation of multiple H‐bond interactions with protonated amino groups stabilize the adduct.

中文翻译：

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99TcO4−：水溶液中的选择性识别和诱捕

太热手柄：前所未有的亲和力和特异性⁹⁹ TCO ₄ ^-在水溶液中显示出与p在hexaprotonated形式（参见方案） -二甲苯azacryptand。配合物的晶体结构揭示了阴离子如何在笼子的腔内适合，并且与质子化的氨基形成多个H键相互作用可稳定加合物。