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Issue 3, 2019
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Luminescence studies of new [C,N,N′] cyclometallated platinum(II) and platinum(IV) compounds

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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

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The article was received on 29 Oct 2018, accepted on 10 Dec 2018 and first published on 17 Dec 2018

Article type: Paper
DOI: 10.1039/C8NJ05492D
Citation: New J. Chem., 2019,43, 1247-1256

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    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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