Gold chloride cluster ions generated by vacuum laser ablation

摘要: In this work, a simple way for study the possibility of formation vapor cluster species tetrachloroauric acid (HAuCl4), using laser ablation in absence buffer or reactive atmosphere, and without postablation supersonic expansion on commercial matrix assisted desorption/ionization time-of-flight mass spectrometer, is reported. Tetrachloroauric known as precursor synthesis gold nanostructures complex salts; therefore it an important task to discover quantify arising from HAuCl4, order understand their role reactions. Mass spectrum HAuCl4 reflector negative-ion mode contains hydrated mono- dinuclear clusters m/z range 286–436, chloride 447–795. first part spectrum, type Au n − (H2O)m (n = 1–2; m = 1, 2, 5, 7, 8) [Aun(OH)k]−(H2O)m k = 1–2; 4–8) were found. Besides that, there are with general formula [AuHr(HCl)2]−(H2O)m (m = 1–5; 8–9; r = 0–2) spectrum. second 447–795, only obtained. Their formulae can be written [AuClt(HCl)v]−(H2O)m (t = 1–4; v = 5–8; m = 2–4, 6–8) [Aun(HCl)v]−(H2O)m (n = 1–2, v = 4–5, m = 1–2, 7). The analysis concentration effects LDI spectra reveals that relative intensities signals Au increase decreasing water solutions.