Metal hydrides form halogen bonds: measurement of energetics of binding.

Metal hydrides form halogen bonds: measurement of energetics of binding.
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DOI:
10.1021/ja4121499
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发表时间:
2014-01-29
影响因子:
15
通讯作者:
Perutz RN
Perutz RN
中科院分区:
化学1区
文献类型:
--
作者:
Smith DA;Brammer L;Hunter CA;Perutz RN

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用~ 1H NMR研究了碘代五氟苯和1-碘代全氟己烷与一系列双(η5-π)金属配合物(Cp_2TaH_3,1; Cp_2MH_2,M = Mo,2,M = W,3; Cp_2ReH,4; Cp_2Ta(H)CO,5; Cp = η5-π)之间的卤键形成.研究了配合物1与C6 F5 I和C6 F13 I的相互作用势和相互作用熵(ΔH° = −10.9 ± 0.4和−11.8 ± 0.3 kJ/mol; ΔS° = −38 ± 2和−34 ± 2 J/(mol·K)),并发现比具有氢键供体吲哚的1更强(ΔH° = −7.3 ± 0.1 kJ/mol,ΔS° = −24 ± 1 J/(mol·K))。对于反应性更强的配合物2-5,测量仅限于测定它们与C6 F5 I的低温(212 K)缔合常数,分别为2.9 ± 0.2、2.5 ± 0.1、<1.5和12.5 ± 0.3 M-1。
The formation of halogen bonds from iodopentafluorobenzene and 1-iodoperfluorohexane to a series of bis(η5-cyclopentadienyl)metal hydrides (Cp2TaH3, 1; Cp2MH2, M = Mo, 2, M = W, 3; Cp2ReH, 4; Cp2Ta(H)CO, 5; Cp = η5-cyclopentadienyl) is demonstrated by 1H NMR spectroscopy. Interaction enthalpies and entropies for complex 1 with C6F5I and C6F13I are reported (ΔH° = −10.9 ± 0.4 and −11.8 ± 0.3 kJ/mol; ΔS° = −38 ± 2 and −34 ± 2 J/(mol·K), respectively) and found to be stronger than those for 1 with the hydrogen-bond donor indole (ΔH° = −7.3 ± 0.1 kJ/mol, ΔS° = −24 ± 1 J/(mol·K)). For the more reactive complexes 2–5, measurements are limited to determination of their low-temperature (212 K) association constants with C6F5I as 2.9 ± 0.2, 2.5 ± 0.1, <1.5, and 12.5 ± 0.3 M–1, respectively.
DOI: 10.1039/j19710001350
发表时间: 1971-01-01
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