Supramolecular Construction of Cyanide-Bridged Re<sup>I</sup> Diimine Multichromophores Kristina S. Kisel Alexei S. Melnikov Elena V. Grachova Antti J. Karttunen Antonio Doménech-Carbó Kirill Yu. Monakhov Valentin G. Semenov Sergey P. Tunik Igor O. Koshevoy 10.1021/acs.inorgchem.8b02974.s001 https://acs.figshare.com/articles/journal_contribution/Supramolecular_Construction_of_Cyanide-Bridged_Re_sup_I_sup_Diimine_Multichromophores/7578716 The reactions of labile [Re­(diimine)­(CO)<sub>3</sub>(H<sub>2</sub>O)]<sup>+</sup> precursors (diimine = 2,2′-bipyridine, bpy; 1,10-phenanthroline, phen) with dicyanoargentate anion produce the dirhenium cyanide-bridged compounds [{Re­(diimine)­(CO)<sub>3</sub>}<sub>2</sub>CN)]<sup>+</sup> (<b>1</b> and <b>2</b>). Substitution of the axial carbonyl ligands in <b>2</b> for triphenylphosphine gives the derivative [{Re­(phen)­(CO)<sub>2</sub>(PPh<sub>3</sub>)}<sub>2</sub>CN]<sup>+</sup> (<b>3</b>), while the employment of a neutral metalloligand [Au­(PPh<sub>3</sub>)­(CN)] affords heterobimetallic complex [{Re­(phen)­(CO)<sub>3</sub>}­NCAu­(PPh<sub>3</sub>)]<sup>+</sup> (<b>4</b>). Furthermore, the utilization of [Au­(CN)<sub>2</sub>]<sup>−</sup>, [Pt­(CN)<sub>4</sub>]<sup>2–</sup>, and [Fe­(CN)<sub>6</sub>]<sup>4–/3–</sup> cyanometallates leads to the higher nuclearity aggregates [{Re­(diimine)­(CO)<sub>3</sub>NC}<sub><i>x</i></sub>M]<sup><i>m</i>+</sup> (M = Au, <i>x</i> = 2, <b>5</b> and <b>6</b>; Pt, <i>x</i> = 4, <b>7</b> and <b>8</b>; Fe, <i>x</i> = 6, <b>9</b> and <b>10</b>). All novel compounds were characterized crystallographically. Assemblies <b>1</b>–<b>8</b> are phosphorescent both in solution and in the solid state; according to the DFT analysis, the optical properties are mainly associated with charge transfer from Re tricarbonyl motif to the diimine fragment. The energy of this process can be substantially modified by the properties of the ancillary ligands that allows to attain near-IR emission for <b>3</b> (λ<sub>em</sub> = 737 nm in CH<sub>2</sub>Cl<sub>2</sub>). The Re–Fe<sup>II/III</sup> complexes <b>9</b> and <b>10</b> are not luminescent but exhibit low energy absorptions, reaching 846 nm (<b>10</b>) due to Re<sup>I</sup> → Fe<sup>III</sup> transition. 2019-01-11 18:03:30 charge transfer diimine fragment Cyanide-Bridged Re novel compounds Diimine Multichromophores CH 2 Cl 2 near-IR emission energy absorptions dicyanoargentate anion NC CN 737 nm Supramolecular Construction DFT analysis x M 846 nm Re tricarbonyl motif III II carbonyl ligands