Absorption spectroscopy Acids Air stable Chemistry, Bioinorganic Coordination Complexes Crystallography, X-Ray Electromagnetic spectra Hydrogen-Ion Concentration Ligand design Light sources Models, Molecular Nitric oxide Nitrogen Oxides Octahedral coordination Oxidation-Reduction PH Photo-detachment Ruthenium X ray crystallography acid chemistry coordination compound inorganic chemistry molecular model nitrogen oxide nitroxyl oxidation reduction reaction pH ruthenium