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【答案】应助回帖
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yunzhijun112: 金币+10, 翻译EPI+1, ★有帮助 2013-03-23 11:33:51
sltmac: 金币+30, 欢迎常来本版交流 2013-03-26 08:48:05
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Metalloporphyrin has characteristic absorption bands in the UV-vis region. And according to the Gouterman four orbital model, the D4h symmetric metalloporphyrin has two energy close a1μ(π) and a2μ(π) levels on the high occupied molecular obital (HOMO), and a couple of degenerated eg(π＊) levels on the low unoccupied molecular orbital(LUMO). The transitions from a1μ(π)、a2μ(π) to eg(π＊) will generate two single excitation transitions. The strong absorption band B at ca. 400 nm is due to a1μ(π) →eg(π＊) transition, and the weak absorption band Q at ca. 500～600 nm is due to a2μ(π)→eg(π＊) transition. The Q band includes αand βabsorption bands with the former lying at the higher wavelength. It can be seen from Fig. 5 that the B、α和βabsorption bands of ZnPP-PS are at 425，559，599 nm, respectively, which is in well agreement with the electron absorption spectroscopy of the small molecule ZnPP reported in Ref. [16]. This demonstrates that the functional mtalloporphyrin polymer ZnPP-PS formed by the polymerization of ZnPP maintained (reserved) the spectroscopic properties of the small molecule ZnPP. |
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