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In this work, the matrix-assisted laser desorption and ionization  time-of-flight (MALDI-TOF) mass spectra of two cationic complexes, i.e.,  [PdCl(dien)]Cl and [Ru(en)2Cl2]Cl, acquired under different conditions were  analyzed. The spectra were recorded with three matrices with or without  trifluoroacetic acid (TFA), i.e., two traditional matrices, i.e.,  2,5-dihydroxybenzoic acid and α-cyano-hydroxycinnamic acid, and one  flavonoid, quercetin. The spectra acquired with quercetin appeared to be the  simplest, whereas in the spectra obtained with other matrices, peaks arising  either from the addition of matrix molecules or from the fragmentation  products were detectable. Addition of TFA did not complicate the spectra of  the Pd(II) and Ru(III) complexes when the traditional matrices were used. On  the other hand, the spectra of Pd complex were simpler, whereas the addition  of TFA in the case of the Ru complex resulted in a higher number of peaks,  some of which could not be identified. Taken together, the results of this  study once more emphasize the differences arising in the MALDI-TOF mass  spectra of transition metal complexes in dependence on the applied matrix

Comparison of MALDI-TOF mass spectra of [PdCl(dien)]Cl and [Ru(en)2Cl2]Cl acquired with different matrices