The time of flight mass spectrometry is an efficient techniques for the identification and characterization of chemical compounds. In this technique, the ions produced via the interaction of the laser radiation with sample are accelerated in an electric field. After obtaining enough kinetic energy, the ions enter in a field free region and are separated based on their mass/charge ratio and reach to the detector at different times. In this thesis, the time of flight mass spectra of several Schiff base and inorganic complexes containing central atoms such as Fe, Co, Ni, Cu and V were recorded using the laser desorption-ionization technique on the aluminum and its anodized surface, separately and the ionic species of each compound were determined. The employed laser light was in the infrared region with the wavelength of 1064 nm. The mass spectra recorded in this work were simpler compared to the mass spectra of the other complexes recorded by Matrix-Assisted Laser Desorption-Ionization (MALDI) technique reported in literature so that that the determination of the molecular weights of some complexes were possible. The effect of the structure of complex on its stability against the laser radiation was also investigated in this work and it was found that the presence of one substitution on the ligand of complex change the stability of complex considerably.