This book presents original research results on the leading edge of chemistry research. Each article has been carefully selected in an attempt to present substantial research results across a broad spectrum. Topics discussed include the molecular cluster ensembles in biomatrices and the influence of ETIs; sulfur compounds as antioxidants; ensembles of molecular clusters in water HCl; applications of DSMO in organic semiconductor fields; influence of water-dimethyl sulphoxide medium on complex-forming properties of crown ether 18-crown-6; growth and characterisation of antimony nanostructures on inert layer-material substrates; adsorption of gaseous Hg0 and HgCL2 with innovative composite suphlurised activated carbons; sulphur compounds significance in fossil fuels and their impact on the environment; and catalysis using oxovanadium complexes of 4-acylpyrazolone ligand.