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[求助] 英語論文翻譯，發(fā)光材料

Upon grinding, the non-radiative deactivation pathways were obviously blocked, with a non-radiative rate constant of knr =2.9× 10ˆ8 sˆ1 (Fig. S6,† τ= 3.0 ns, ΦPL = 12.3%), which was obviously smaller that of the original crystals. Thus, it was suggested that the molecular conformation of the TPA-CO crystals became planar upon grinding. This proposal was further verified by a slight red-shift of approximately 9 nmin the diﬀuse reflectance absorption spectrum (Fig. 4a). The molecular conformational change of the TPA-CO crystals in responseto hydrostatic pressure was further studied by Raman spectroscopy. The high-pressure experiments were performed in a diamond anvil cell (DAC) with 0.5 mm diamond culets. A small piece of crystal was loaded into the DAC with a ruby chip to
determine in situ pressure calibration. A 4 : 1 mixture of methanol–ethanol was used as the pressure transmittingmedium. As depicted in Fig. 4b, the Raman absorption band at 1652 cmˆ1 was assigned to the C＝O stretching mode at normal pressure. Interestingly, this band was shifted to the lower frequency of 1649 cmˆ1, whereas other bands were shifted to higher frequencies as the pressure was increased up to 1.51 GPa. The change corresponded to extension of the electron delocalization, which resulted in conformational planarization of benzophenone.

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1樓 2014-10-14 15:51:19

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【答案】應(yīng)助回帖

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團(tuán)子小姐: 金幣+10, 翻譯EPI+1, ★★★★★最佳答案, 謝謝 2014-10-15 20:09:56

在研磨時，明顯阻斷了非放射失活的途徑，非放射速率常數(shù)KNR= 2.9×10^8 s^1（圖S6，†τ= 3.0納秒，ΦPL=12.3％），明顯比原始晶體小。因此，有人提出，TPA-CO晶體的分子構(gòu)象在研磨時變成為平面。這一建議在擴(kuò)散反射吸收光譜中得到進(jìn)一步證實，表現(xiàn)為約9nm的輕微紅移（圖4a）。用Raman光譜進(jìn)一步研究了TPA-CO晶體在流體靜壓力作用下的分子構(gòu)象變化。對具有0.5毫米鉆石底尖的金剛石壓腔（DAC）進(jìn)行高壓實驗。用一紅寶石芯片將一小片晶體加載到DAC，以確定現(xiàn)場壓力校準(zhǔn)。用甲醇 - 乙醇混合物（4：1）作為壓力傳遞發(fā)介質(zhì)。如圖4b所示，在正常壓力下，在1652 CM^1的Raman吸收帶被定為C = O的伸縮模式。有趣的是，隨著壓力增加至1.51 GPa，這條帶轉(zhuǎn)移到較低頻率的1649 CM^1，而其它帶則被轉(zhuǎn)移到更高的頻率。對應(yīng)于電子離域的擴(kuò)展而發(fā)生的這些變化，又導(dǎo)致了二苯甲酮的構(gòu)象平面化。

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2樓2014-10-14 23:38:25

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