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The missing link: Triplet fluorocarbonyl nitrene FC(O)N

机译:缺失的链接:三重碳氟碳氧基硝基Fc(O)n

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摘要

The elusive triplet fluorocarbonyl nitrene, FC(O)N (X~(3″)), has been generated in high yield from matrix-isolated FC(O)N_3 by ArF excimer laser photolysis (λ=193 nm). As a side product FNCO was formed. The novel nitrene was characterized by IR, UV/Vis, EPR spectroscopy, and quantum-chemical calculations. All six fundamental vibrations of FC(O)N at 1681.3, 1193.8, 879.8, 646.5, 588.7, and 434.8 cm~(-1) (argon matrix, 16 K), their ~(12/13)C, ~(16/18)O, and ~(14/15)N isotopic shifts, and four electronic transitions at T_0=13 890, 25 428, 29 166, and 30 900 cm~(-1) that exhibit vibrational fine structures have been detected. Under visible-light irradiation at λ≥495 nm, FC(O)N reacted with molecular N_2 in the matrix cage at 6 K to give back FC(O)N _3, whereas near-UV irradiation at λ≥335 nm yielded FNCO. The singlet-triplet energy gaps of different carbonyl nitrenes are discussed.
机译:通过ARF准分子激光光解(λ= 193nm),从基质分离的Fc(O)N_3高产量,产生难以置信的三元氟烷碳氧基氮氧化乙烯,Fc(O)N(X〜(3“))。 作为侧面产品FNCO形成。 通过IR,UV / VI,EPR光谱和量子化学计算,该新型硝酸氮是特征。 FC(o)n的所有六个基本振动,1681.3,1193.8,879.8,646.5,588.7和434.8cm〜(-1)(氩基矩阵,16 k),它们〜(12/13)c,〜(16 / 18)O和〜(14/15)N同位素移位,并在T_0 = 13 890,25 428,29166和30 900cm〜(-1)下进行了四个电子转换,其具有表现出具有振动细结构的T_0 = 13 890,25 428,29166和30 900cm〜(-1)。 在λ≥495nm的可见光照射下,在6k的基质笼中与分子N_2反应的Fc(O)n,以返回Fc(O)n _3,而λ≥335nm的近UV照射产生Fnco。 讨论了不同羰基元素的单态三重态能量间隙。

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