Issue 3, 2019

Luminescence studies of new [C,N,N′] cyclometallated platinum(ii) and platinum(iv) compounds

Abstract

The synthesis of six novel cyclometallated platinum(IV) compounds (3a–3c and 4a–4c) derived from ligand (4-FC6H4)CH[double bond, length as m-dash]N(CH2)3N(CH3)2 (L) was achieved by intermolecular oxidative addition of halogens to cyclometallated platinum(II) compounds [Pt(CH3){(CH3)2N(CH2)3N[double bond, length as m-dash]CH(4-FC6H3)}] (1) and [PtX{(CH3)2N(CH2)3N[double bond, length as m-dash]CH(4-FC6H3)}] (2a, X[double bond, length as m-dash]Cl; 2b, X[double bond, length as m-dash]Br; 2c, X[double bond, length as m-dash]I). While compound 2b could be obtained from 2a through Cl for Br substitution reaction, 2c was best obtained through cyclometallation of ligand L with [PtI2(dmso)2]. The X-ray molecular structures of [C,N,N′] platinum(II) (2b) and platinum(IV) (3b and 4b) cyclometallated compounds and of the [N,N′] platinum(II) compound Ib, all of them containing bromido ligands, are reported. The absorption and emission spectra were also studied in dichloromethane solution at room temperature. All compounds, except 3c and 4c arising from oxidative addition of iodine, display a broad emission band in the 340–360 nm range, attributed to platinum disturbed intraligand (IL) transitions, when excited at the highest energy band, and higher emission intensities were observed, in general, for cyclometallated platinum(IV) compounds.

Graphical abstract: Luminescence studies of new [C,N,N′] cyclometallated platinum(ii) and platinum(iv) compounds

Supplementary files

Article information

Article type
Paper
Submitted
29 Oct 2018
Accepted
10 Dec 2018
First published
17 Dec 2018

New J. Chem., 2019,43, 1247-1256

Luminescence studies of new [C,N,N′] cyclometallated platinum(II) and platinum(IV) compounds

A. Lázaro, O. Serra, L. Rodríguez, M. Crespo and M. Font-Bardia, New J. Chem., 2019, 43, 1247 DOI: 10.1039/C8NJ05492D

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