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This is the first report on the selective synthesis of a pair of isomers of <jats:italic>cis<\/jats:italic>\u2010[Ru(L)(L\u2032)XY]<jats:sup><jats:italic>n<\/jats:italic>+<\/jats:sup> (L\u2260L\u2032: bidentate ligands; X\u2260Y: monodentate ligands). The structures of the ruthenium(II) complexes are clarified by means of X\u2010ray crystallography, and the signals in the <jats:sup>1<\/jats:sup>H\u2005NMR spectra are assigned based on <jats:sup>1<\/jats:sup>H\u2013<jats:sup>1<\/jats:sup>H COSY spectra. The colors of the two isomers are clearly different in both the solid state and solution: the <jats:italic>trans<\/jats:italic>(Cl,N<jats:sub>bpy<\/jats:sub>) isomer has a deep red color, whereas the <jats:italic>trans<\/jats:italic>(Cl,N<jats:sub>Hdpa<\/jats:sub>) isomer is yellow. Although both complexes have intense absorption bands at <jats:italic>\u03bb<\/jats:italic>\u2248440\u2013450\u2005nm, only the <jats:italic>trans<\/jats:italic>(Cl,N<jats:sub>bpy<\/jats:sub>) isomer has a shoulder band at <jats:italic>\u03bb<\/jats:italic>\u2248550\u2005nm. DFT calculations indicate that the LUMOs of both isomers are the \u03c0* orbitals in the bpy ligand, and that the LUMO level of the <jats:italic>trans<\/jats:italic>(Cl,N<jats:sub>bpy<\/jats:sub>) isomer is lower than that of the <jats:italic>trans<\/jats:italic>(Cl,N<jats:sub>Hdpa<\/jats:sub>) isomer due to the <jats:italic>trans<\/jats:italic> effect of the Cl ligand; thus resulting in the appearance of the shoulder band. The HOMO levels are almost the same in both isomers. The energy levels are experimentally supported by cyclic voltammograms, in which these isomers have different reduction potentials and similar oxidation potentials.<\/jats:p>","DOI":"10.1002\/chem.201903706","type":"journal-article","created":{"date-parts":[[2019,10,9]],"date-time":"2019-10-09T05:29:25Z","timestamp":1570598965000},"page":"16582-16590","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Syntheses and Characterization of a Pair of Isomers of Heteroleptic Bis(Bidentate) Ruthenium(II) Complexes with Two Different Monodentate Ligands"],"prefix":"10.1002","volume":"25","author":[{"given":"Mari","family":"Toyama","sequence":"first","affiliation":[{"name":"Current address: Osaka Prefecture University College of Technology  26-12 Saiwaicho Neyagawa Osaka 572-8572 Japan"},{"name":"Department of Chemistry of Functional Molecules, Faculty of Science and Engineering Konan University  8-9-1 Okamoto, Higashinada Kobe 658-8501 Japan"},{"name":"Department of Applied Chemistry School of Science and Technology Meiji University  1-1-1 Higashi-Mita, Tama-ku Kawasaki Kanagawa 214-8571 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takako","family":"Takizawa","sequence":"additional","affiliation":[{"name":"Department of Applied Chemistry School of Science and Technology Meiji University  1-1-1 Higashi-Mita, Tama-ku Kawasaki Kanagawa 214-8571 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Itaru","family":"Morita","sequence":"additional","affiliation":[{"name":"Department of Applied Chemistry School of Science and Technology Meiji University  1-1-1 Higashi-Mita, Tama-ku Kawasaki Kanagawa 214-8571 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Noriharu","family":"Nagao","sequence":"additional","affiliation":[{"name":"Department of Applied Chemistry School of Science and Technology Meiji University  1-1-1 Higashi-Mita, Tama-ku Kawasaki Kanagawa 214-8571 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yusuke","family":"Kuramochi","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Graduate School of Science Kitasato University  1-15-1 Kitasato Sagamihara Kanagawa 252-0373 Japan"},{"name":"Current address: Department of Chemistry, Faculty of Science Division II Tokyo University of Science  1\u20133 Kagurazaka, Shinjuku-ku Tokyo 162-8601 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hitoshi","family":"Ishida","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Graduate School of Science Kitasato University  1-15-1 Kitasato Sagamihara Kanagawa 252-0373 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