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Cyclometallated derivatives of platinum(II) derived from 6-(tert-butyl)-2,2′-bipyridine (HL): crystal and molecular structure of [Pt(L)CI]

Minghetti, Giovanni and Cinellu, Maria Agostina and Stoccoro, Sergio and Zucca, Antonio and Manassero, Mario (1995) Cyclometallated derivatives of platinum(II) derived from 6-(tert-butyl)-2,2′-bipyridine (HL): crystal and molecular structure of [Pt(L)CI]. Journal of the Chemical Society. Dalton Transactions, Vol. 1995 (5), p. 777-781. ISSN 0300-9246. Article.

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DOI: 10.1039/DT9950000777

Abstract

The reaction of K2[PtCI4] with 6-(tert-butyl)-2,2′-bipyridine (HL) gave [Pt(L)CI]1a a cyclometallated species resulting from direct activation of a methyl C–H bond. The structure has been determined by X-ray diffraction. The crystals contain two independent molecules: average values for the principal parameters are Pt–CI 2.300, Pt–C 2.003, Pt–N (trans to C) 2.114 and Pt–N (trans to CI) 1.948 Å. The chlorine atom in 1a can easily be displaced by neutral ligands (L′); in the presence of NaBF4 the cationic species [Pt(L)(L′)][BF4](L′= PPh32, CO 3 or 3,5-dimethylpyridine 4) were isolated in good yields. With potentially bidentate neutral ligands, L″–L″[Ph2P(CH2)2PPh2(dppe), Ph2P(CH2)2AsPh2(dadpe) or Ph2PCCPPh2(dppa)], [LPt(µ–L″–L″)PtL]2+(L″–L″= dppe 5, dadpe 6 or dppa 7) or [PtL(L″–L″)]+ species (L″–L″= dppe 8 or dadpe 9) can be obtained by adequate choice of the L″–L″ : Pt molar ratio (1 : 2 or 1 : 1, respectively). The new complexes 1–9 were characterized in solution by 1H, 13C-{1H} NMR spectra.

Item Type:Article
ID Code:5364
Status:Published
Refereed:Yes
Uncontrolled Keywords:Cyclometallated species, methyl C–H bond, 1H, 13C-{1H} NMR spectra
Subjects:Area 03 - Scienze chimiche > CHIM/03 Chimica generale e inorganica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:Royal Society of Chemistry
ISSN:0300-9246
Deposited On:27 Jan 2011 12:37

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