The mass spectral analysis of metal salts, especially lanthanide and transition metal salts, can be challenging. Although getting information on the metal present is usually straightforward, obtaining information on the correct oxidation state and anion composition is challenging. Many ionisation techniques have some redox component to the ionisation process, which commonly results in changing the oxidation state of the metal and the associated loss of ligand and anion information. We present here a simple method for negative ion matrix‐assisted laser desorption/ionisation mass spectrometry using the non‐acidic flavonoid flavone as a novel matrix. This results in reliable information on the oxidation state of the metal as spectra are dominated by anion adduct ions with very little (typically no) redox processes occurring.

中文翻译：

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黄酮作为一种新型基质，用于镧系元素和过渡金属盐的基质辅助激光解吸/电离分析。

金属盐（尤其是镧系元素和过渡金属盐）的质谱分析可能具有挑战性。尽管获取有关存在的金属的信息通常很简单，但是获取有关正确的氧化态和阴离子组成的信息却具有挑战性。许多电离技术在电离过程中都具有某些氧化还原成分，通常会导致金属的氧化态改变以及配体和阴离子信息的损失。我们在这里介绍一种使用非酸性类黄酮黄酮作为新型基质的负离子基质辅助激光解吸/电离质谱的简单方法。由于光谱被阴离子加成离子所控制，几乎没有（通常没有）氧化还原过程发生，因此可以得到有关金属氧化态的可靠信息。