Dipyridocatecholate-bridged complexes of platinum and ruthenium diimine chromophores
- Univ. of Rochester, NY (United States). Dept. of Chemistry
New Ru-Pt heterometallic complexes have been prepared and their electrochemical and luminescence properties characterized. One series of complexes contains a tris diimine-chelated Ru(II) center linked to one, two, or three Pt(II) diimine moieties via a dipyridocatecholate (dpcat; 1,10-phenanthroline-5,6-diolate) bridging ligand, as indicated by the general formula [(dbbpy){sub 3{minus}n}Ru(({micro}-dpcat)Pt(dbbpy)){sub n}](PF{sub 6}){sub 2} (n = 1--3) where dbbpy = di-tert-butylbipyridine. A different dinuclear complex has a tetrapyridophenazine (tppz) bridge connecting a Ru(diimine){sub 3}{sup 2+} chromophore with a Pt diimine dithiolate center and has the formula [(dbbpy){sub 2}Ru({mu}-tppz)Pt(tdt)]{sup 2+} where tdt = toluene-3,4-dithiolate. The dpcat-bridged complexes exhibit numerous redox processes that are assigned on the basis of comparison of those shown by mononuclear precursors and analogues, i.e., Ru(diimine){sub 3}{sup 2+} and Pt(dbbpy)(dpcat). The dpcat-bridged complexes display distinct absorption bands due to Ru(diimine){sub 3}{sup 2+} and Pt(diimine)(diolate) chromophores at ca. 450 and 540 nm, respectively. Emission from the Pt center is observed at 77 K upon direct irradiation of this center as well as excitation of the Ru center. In contrast the mononuclear complex Pt(dbbpy)(dpcat) does not luminescence, even in rigid media at low temperature.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- OSTI ID:
- 653425
- Journal Information:
- Inorganic Chemistry, Vol. 37, Issue 16; Other Information: PBD: 10 Aug 1998
- Country of Publication:
- United States
- Language:
- English
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