Solvent and temperature dependence of intramolecular energy transfer in the complex ((dmb) sub 2 Ru(b-b)Ru(dmb)(CN) sub 2 ) sup 2+

Journal Article · Wed Nov 15 23:00:00 EST 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100360a043· OSTI ID:7109199

Ryu, C K; Schmehl, R H ^[1]

---

1. Tulane Univ., New Orleans, LA (USA)

The complex ((dmb){sub 2}Ru(b-b)Ru(dmb)(CN){sub 2}){sup 2+}, 1, was prepared (dmb = 4,4{prime}-dimethyl-2,2{prime}-bipyridine and b-b = 1,4-bis(2-(4{prime}-methyl-2,2{prime}-bipyridyl-4-yl)ethyl)benzene), and the redox and photophysical properties of the complex were examined in several solvents. Luminescence is observed from the Ru {yields} dmb metal to ligand charge-transfer (MLCT) states of both the ((dmb){sub 2}Ru(b-b)) and ((b-b)Ru(dmb)(CN){sub 2}) chromophores. The lifetime of the higher energy ((dmb){sub 2}Ru(b-b)) center of 1 is less than 450 ns in each solvent studied at room temperature, indicating significant quenching of the complex. Excitation spectra of the ((b-b)Ru(dmb)(CN){sub 2}) emission of complex 1 indicate that energy transfer from the ((dmb){sub 2}Ru(b-b)) center is contributing to the emission. From the emission energy of the ((dmb){sub 2}Ru(b-b)) center and redox data, photoinduced electron-transfer quenching of the donor is shown to be endergonic. The energy-transfer process exhibits both solvent dependence and temperature dependence. The temperature dependence of the energy-transfer rate between 200 and 300 K indicates the existence of more than one energy-transfer path. The data are analyzed in terms of combined Coulombic and electron-exchange energy-transfer mechanisms.

• OSTI ID: 7109199
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:23; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360000* -- Materials
360100 -- Metals & Alloys
360104 -- Metals & Alloys-- Physical Properties
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
CYANIDES
DATA
ENERGY TRANSFER
EXPERIMENTAL DATA
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
PHOTOCHEMISTRY
REDOX REACTIONS
RUTHENIUM COMPLEXES
SOLVENT PROPERTIES
TRANSITION ELEMENT COMPLEXES