Structural properties of the metallointercalator cationic complex (2,2 `: 6 `,2 `'-terpyridine)methylplatinum(II) ion
Articolo
Data di Pubblicazione:
2000
Abstract:
The complex [Pt(tpy)(Me)](+) (BPh4)(-) (tpy = 2,2':6',2 "-terpyridine) crystallizes in the triclinic space group with a = 13.463(2) Angstrom, b = 13.618(3) Angstrom, c = 20.151(4) Angstrom, alpha = 73.59(2), beta = 74.56(3), gamma = 65.82(2)degrees and Z = 4. The final conventional R factor is 0.035. In the unit cell a couple of weakly interacting dimers are formed by stack of two [Pt(tpy)(Me)](+) cations in a head-to-tail fashion with intermolecular Pt ... Pt distances of 4.437(1) and 4.931(1) Angstrom, respectively. The absorption spectra of [Pt(tpy)(Me)](+) (BPh4)(-) in acetonitrile show bands assigned to pi-pi* and to MLCT transitions. The analysis of the dependence of the spectra on complex concentration gives a fairly low value for the dimerization equilibrium constant (K-d = 180 +/- 52 M-1 at 298 K). These fluid solutions are not emissive. The room-temperature solid-state emission spectra of the salts [Pt(tpy)(Me)]X are strongly dependent on the counterion (X = BPh4-, Cl-, PF6-, ClO4-, CF3SO3-). The cationic complex shows a considerable stability upon acidification and carbonilation in water
Tipologia CRIS:
01.01 Articolo in rivista
Keywords:
ELECTRONIC SPECTROSCOPY; 2; 2' 6'; 2''-TERPYRIDINE; LUMINESCENCE PROPERTIES; PLATINUM(II) COMPLEXES; TERPYRIDINE COMPLEXES; CRYSTAL-STRUCTURE; LIGANDS; CHLORO(TERPYRIDINE)PLATINUM(II); ABSORPTION; EQUILIBRIA
Elenco autori:
MONSU SCOLARO, Luigi; Plutino, MARIA ROSARIA
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