Permanent Encapsulation or Host–Guest Behavior of Aromatic Molecules in Hexanuclear Arene Ruthenium Prisms

Abstract

Cationic arene ruthenium metallaprisms of the general formula [Ru 6 (p-cymene) 6 (tpt) 2 (OOʝOO) 3 ] 6+ {tpt = 2,4,6-tris(4-pyridyl)-1,3,5-triazine; OOʝOO = 9,10-dioxo-9,10-dihydroanthracene-1,4-diolato ) and car-

Excellent Correlation between Drug Release and Portal Size in Metalla‐Cage Drug‐Delivery Systems

“…Indeed, in this complex the lengths of the CO bonds are between 1.27(1) and 1.32(2) , which suggests an intermediate bond order between single (~1.40 ) and double 20 ). [23] In addition to these C=O signals, strong absorptions due to the stretching vibrations of the triflate anions (1260 (s), 1030 (s), 638 cm 1 (m)) are observed in the infrared spectra of all the salts…”

“…[19,20] The cavities of [1-3] 6 + are of an equivalent size, but the use of different OO\OO connectors controls their portal size, thus modulating the dynamics of the host-guest systems. The encapsulation of PdA C H T U N G T R E N N U N G (acac) 2 and pyrene-R in these cages requires the addition of silver triflate to the corresponding dinuclear arene-ruthenium complexes [Ru 2 (p-iPrC 6 …”

“…[21] In particular, in the electronic absorption spectra of [PdA C H T U N G T R E N N U N G (acac) 2 &2] 6 + and [pyrene-R&2] 6 + , two bands at 570 and 615 nm are remarkably well resolved, which is consistent with the spectrum of the empty metalla-prism [2] 6 + . [20] The infrared spectra of the metalla-prisms are dominated by absorptions of the coordinated OO\OO bridging ligands. It is particularly noticeable that a significant redshift of about 20 cm À1 is observed for the C=O vibration frequencies of the quinone bridging ligands in all these spectra relative to the frequencies of the corresponding non-coordinated bridging ligands 5,8-dihydroxy-1,4-naphthoquinone, 5,8-dihydroxy-1,4-anthraquinone and 6,11-dihydroxy-5,12-naphthacenedione.…”

Self‐Assembled Arene–Ruthenium‐Based Rectangles for the Selective Sensing of Multi‐Carboxylate Anions

“…Because the donor 3 shows no absorption at the lower energy region (> 300 nm), the electronic transition in 4 and 5 could be ascribed to mixed intra- and intermolecular π-π* and MLCT transitions associated with the arene-Ru moiety. [18] …”

Supramolecular Coordination: Self-Assembly of Finite Two- and Three-Dimensional Ensembles

“…Therrien et al were able to encapsulate different planar aromatic molecules such as phenanthrene, pyrene, fluoranthene, benzo[ e ]pyrene, triphenylene, and coronene into the hydrophobic cavity of a series of cationic (arene)ruthenium-based trigonal prisms [Ru 6 (η 6 - p -cymene) 6 ( 285 ) 2 ( OO ∩ OO ) 3 ] 6+ 363-367 [ OO ∩ OO = 2,5-dihydroxy-1,4-benzoquinonato (dhbq), 2,5-dichloro-3,6-dihydroxy-1,4-benzoquinonato (dchq), 5,8-dihydroxy-1,4-naphthoquinonato (dhnq), 9,10-dihydroxy-1,4-anthraquinonato (dhaq), or 6,11-dihydroxy-naphthacene-5,12-dionato(dhtq)] by using them as templating guests. 428,429 Empty trigonal prismatic cages 363-367 have been used for host-guest studies and have shown that small aromatic molecules (phenanthrene and pyrene) show rapid inclusion into the hydrophobic cavities of the cages upon gradual addition of guests. However, molecules that are too large to exit the portal of the cages get permanently incarcerated, thus giving rise to stable carceplex systems.…”