Monovalent nickel ion as ionization probe in matrix-assisted laser desorption/ionization mass spectrometry

文献类型： 外文期刊

第一作者： Horikoshi, Toshiki

作者： Horikoshi, Toshiki;Fujino, Tatsuya;Xu, Jiawei;Yang, Mengrui;Chang, Wei

作者机构：

期刊名称：INTERNATIONAL JOURNAL OF MASS SPECTROMETRY （ 影响因子：1.7； 五年影响因子：1.6 ）

ISSN： 1387-3806

年卷期： 2024 年 506 卷

页码：

收录情况： SCI

摘要： We have developed NiO/HM20, a matrix composed of NiO nanoparticles (NiO) loaded on zeolite surface, for matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS). By photoexcitation, monovalent nickel ion (Ni+) was dominantly observed with high intensity. The mechanism of Ni+ production was studied by picosecond time-resolved emission spectroscopy. By loading NiO on the zeolite surface, a new relaxation pathway to other electronic excited states was observed, which increased the lifetime of electron-hole pairs and promoted the reduction of nickel. The long-lived charge-separated electronic excited state corresponding to the large polarization of NiO was confirmed by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction spectroscopy (XRD). The correlation between the Auger parameter related to the polarization energy and the Ni+ peak intensity in the mass spectrum was confirmed. By applying the developed NiO/ HM20 matrix to the MS measurement of small molecules, we found that molecules were ionized through complex formation with Ni+ using the coordination of lone electron pairs or it-electrons in the analyte molecules.

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