The results on chemical reactions of metal atoms, small clusters and nanopa
rticles with different organic and inorganic substances in the temperature
range 12-300 K are presented. Complexation and reactions of atoms and clust
ers of magnesium, samarium and silver with alkyl halides, carbon dioxide, e
thylene and some mesogenic cyanophenyls were studied by the technique of ma
trix isolation and low temperatrure co-condensation of metal and ligands va
pours, low temperature UV-Vis. IR- and ESR-spectroscopy in the combination
with quantum chemistry calculations. In some cases the reaction products we
re analysed by high performance gas chromatography. It was shown that cryoc
hemical reactions of metal particles of different size reflected the system
redundant energy.