本文選題：表面輔助激光解吸電離飛行時間質譜 + 稠環(huán)芳烴　； 參考：《分析化學》2017年06期

【摘要】：表面輔助激光解吸電離質譜(SALDI-MS)已經成為固態(tài)、液態(tài)樣品分析的重要手段,并且分析對象逐漸由生物大分子擴展到小分子。然而,對小分子電離微觀反應機理的研究仍處于起步階段。本研究選擇3種分子結構相似的稠環(huán)芳烴化合物芘、六苯并苯、紅熒烯作為研究對象,考察了這3種化合物激光電離產物的差異,并研究了激光能量對六苯并苯產物離子分布的影響。結果表明,觀察到芘、六苯并苯多聚體離子產物,還觀測到了六苯并苯失去C_2H_2的碎片離子峰;而沒有觀測到明顯的紅熒烯聚合物離子產物,只觀測到了大量失去C6H5的碎片離子峰。最后,對3種不同化合物的激光電離微觀機理進行了分析。由于芘、六苯并苯具有平面大π鍵,分子間的π-π鍵相互作用是產生多聚體離子的主要原因;而紅熒烯的空間位阻削弱了分子間相互作用,從而阻礙了多聚體離子的形成。
[Abstract]:Surface assisted laser desorption ionization mass spectrometry (SALDI-MSMS) has become an important method for the analysis of solid and liquid samples, and the object of analysis is gradually extended from biological macromolecules to small molecules. However, the mechanism of ionization reaction of small molecules is still in its infancy. In this study, three structurally similar polycyclic aromatic compounds, pyrene, hexabenzobenzene and red fluorene, were selected to investigate the differences of laser ionization products of these three compounds. The effect of laser energy on the ion distribution of hexabenzobenzene products was studied. The results showed that pyrene, hexabenzobenzene polymer ion product, hexabenzobenzene loss fragment ion peak of C_2H_2 were observed, but no obvious red fluorene polymer ion product was observed. Only a large number of fragment ion peaks of C6H5 have been observed. Finally, the microscopic mechanism of laser ionization of three different compounds is analyzed. Due to pyrene, hexobenzobenzene has a large 蟺 bond, the 蟺-蟺 bond interaction between molecules is the main reason for the formation of polymer ions, while the steric hindrance of red fluorene weakens the intermolecular interaction, thus hindering the formation of polymer ions.
【作者單位】： 湖北工業(yè)大學材料與化學工程學院;中國科學院大連化學物理研究所分離分析化學重點實驗室;
【基金】：國家自然科學基金項目(No.51572074)資助~~
【分類號】：O657.63;TQ241.5
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本文編號：1853140