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Abstract
High-irradiance laser ionization time-of-flight mass spectrometry (LI-TOFMS), an established technique for elemental determination, has been applied for the analysis of metalloporphyrins. Many porphyrins and their metal complexes, being organometallic compounds, are hard to dissolve in general organic solvents, hampering the wider application of traditional mass spectrometric techniques. With LI-TOFMS, an environmentally friendly analytical strategy has been demonstrated, which is capable of matrix- and solvent-free analysis of metalloporphyrins, with advantages including direct solid sampling, ease of implementation, and avoidance of sample pre-treatment. Moreover, information about elemental composition, fragments, and intact molecules can be obtained simultaneously using LI-TOFMS, hence expediting the identification of metalloporphyrins. A comparative study of LI-, laser desorption ionization (LDI-), matrix-assisted laser desorption ionization (MALDI-) and electrospray ionization (ESI-) mass spectrometry (MS) has also been conducted.
Highlights
With LI-TOFMS, an environmentally friendly analytical strategy has been demonstrated, which is capable of matrix- and solvent-free analysis of metalloporphyrins, with advantages including direct solid sampling, ease of implementation, and avoidance of sample pre-treatment
Considerable effort has been devoted to the investigation of metalloporphyrins
We focus on an LI-TOFMS analytical strategy, different from those methods mentioned,[5,6,7,8,9,10] for the analysis of metalloporphyrins
Summary
Considerable effort has been devoted to the investigation of metalloporphyrins. These molecules consist of an electrondelocalized tetrapyrrolic unit with one incorporated metal ion. High-irradiance laser ionization time-of-flight mass spectrometry (LI-TOFMS), an established technique for elemental determination, has been applied for the analysis of metalloporphyrins. Several mass spectrometric techniques, such as chemical ionization,[5] electron ionization,[6] MALDI-,7 ESI-,8–10 and secondary ion (SI-) MS,[11,12] have been used to analyze porphyrins and their metal complexes.
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