The synthesis and photophysical studies of cyclometalated Pt(ii) complexes with C,N,N-ligands containing imidazolyl donors

Yu Man Ho; Chi Kin Koo; Ka Leung Wong; Hoi Kuan Kong; Chris Tsz Leung Chan; Wai Ming Kwok; Cheuk Fai Chow; Michael Hon Wah Lam; Wai Yeung Wong

doi:10.1039/c1dt11037c

The synthesis and photophysical studies of cyclometalated Pt(ii) complexes with C,N,N-ligands containing imidazolyl donors

Yu Man Ho, Chi Kin Koo, Ka Leung Wong, Hoi Kuan Kong, Chris Tsz Leung Chan, Wai Ming Kwok, Cheuk Fai Chow, Michael Hon Wah Lam^*, Wai Yeung Wong

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

18 Citations (Scopus)

Abstract

Two new C,N,N-type ligands (HL ₂ and HL ₃), containing a C _phenyl, a N _pyridyl, and a N _imidazolyl donor, and their cycloplatinated complexes, [Pt(L ₂)Cl] (1), [Pt(L ₃)Cl] (2), [Pt(L ₂)(PPh ₃)] ⁺ (3) and [Pt(L ₃)(PPh ₃)] ⁺ (4), have been successfully synthesized and characterized. Spectroscopic and ³MLCT luminescent properties of these Pt(ii) cyclometalated complexes were found to be pH dependent. This was attributed to the protonation/deprotonation of the acidic 1-imidazolyl-NH moieties on the ligands. All the cycloplatinated complexes (both protonated and deprotonated forms) possessed two-photon excitability with two-photon absorption cross-sections ranging from 6.0 to 30.0 GM (protonated forms) and from 16.2 to 24.9 GM (deprotonated forms).

Original language	English
Pages (from-to)	1792-1800
Number of pages	9
Journal	Dalton Transactions
Volume	41
Issue number	6
DOIs	https://doi.org/10.1039/c1dt11037c
Publication status	Published - 14 Feb 2012

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Inorganic Chemistry

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title = "The synthesis and photophysical studies of cyclometalated Pt(ii) complexes with C,N,N-ligands containing imidazolyl donors",

abstract = "Two new C,N,N-type ligands (HL 2 and HL 3), containing a C phenyl, a N pyridyl, and a N imidazolyl donor, and their cycloplatinated complexes, [Pt(L 2)Cl] (1), [Pt(L 3)Cl] (2), [Pt(L 2)(PPh 3)] + (3) and [Pt(L 3)(PPh 3)] + (4), have been successfully synthesized and characterized. Spectroscopic and 3MLCT luminescent properties of these Pt(ii) cyclometalated complexes were found to be pH dependent. This was attributed to the protonation/deprotonation of the acidic 1-imidazolyl-NH moieties on the ligands. All the cycloplatinated complexes (both protonated and deprotonated forms) possessed two-photon excitability with two-photon absorption cross-sections ranging from 6.0 to 30.0 GM (protonated forms) and from 16.2 to 24.9 GM (deprotonated forms).",

author = "Ho, {Yu Man} and Koo, {Chi Kin} and Wong, {Ka Leung} and Kong, {Hoi Kuan} and Chan, {Chris Tsz Leung} and Kwok, {Wai Ming} and Chow, {Cheuk Fai} and Lam, {Michael Hon Wah} and Wong, {Wai Yeung}",

year = "2012",

month = feb,

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doi = "10.1039/c1dt11037c",

language = "English",

volume = "41",

pages = "1792--1800",

journal = "Dalton Transactions",

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publisher = "Royal Society of Chemistry",

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TY - JOUR

T1 - The synthesis and photophysical studies of cyclometalated Pt(ii) complexes with C,N,N-ligands containing imidazolyl donors

AU - Ho, Yu Man

AU - Koo, Chi Kin

AU - Wong, Ka Leung

AU - Kong, Hoi Kuan

AU - Chan, Chris Tsz Leung

AU - Kwok, Wai Ming

AU - Chow, Cheuk Fai

AU - Lam, Michael Hon Wah

AU - Wong, Wai Yeung

PY - 2012/2/14

Y1 - 2012/2/14

N2 - Two new C,N,N-type ligands (HL 2 and HL 3), containing a C phenyl, a N pyridyl, and a N imidazolyl donor, and their cycloplatinated complexes, [Pt(L 2)Cl] (1), [Pt(L 3)Cl] (2), [Pt(L 2)(PPh 3)] + (3) and [Pt(L 3)(PPh 3)] + (4), have been successfully synthesized and characterized. Spectroscopic and 3MLCT luminescent properties of these Pt(ii) cyclometalated complexes were found to be pH dependent. This was attributed to the protonation/deprotonation of the acidic 1-imidazolyl-NH moieties on the ligands. All the cycloplatinated complexes (both protonated and deprotonated forms) possessed two-photon excitability with two-photon absorption cross-sections ranging from 6.0 to 30.0 GM (protonated forms) and from 16.2 to 24.9 GM (deprotonated forms).

AB - Two new C,N,N-type ligands (HL 2 and HL 3), containing a C phenyl, a N pyridyl, and a N imidazolyl donor, and their cycloplatinated complexes, [Pt(L 2)Cl] (1), [Pt(L 3)Cl] (2), [Pt(L 2)(PPh 3)] + (3) and [Pt(L 3)(PPh 3)] + (4), have been successfully synthesized and characterized. Spectroscopic and 3MLCT luminescent properties of these Pt(ii) cyclometalated complexes were found to be pH dependent. This was attributed to the protonation/deprotonation of the acidic 1-imidazolyl-NH moieties on the ligands. All the cycloplatinated complexes (both protonated and deprotonated forms) possessed two-photon excitability with two-photon absorption cross-sections ranging from 6.0 to 30.0 GM (protonated forms) and from 16.2 to 24.9 GM (deprotonated forms).

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U2 - 10.1039/c1dt11037c

DO - 10.1039/c1dt11037c

M3 - Journal article

AN - SCOPUS:84856703102

SN - 1477-9226

VL - 41

SP - 1792

EP - 1800

JO - Dalton Transactions

JF - Dalton Transactions

IS - 6

ER -

The synthesis and photophysical studies of cyclometalated Pt(ii) complexes with C,N,N-ligands containing imidazolyl donors

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