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

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

18 Citations (Scopus)

Abstract

Two new C,N,N-type ligands (HL₂ and HL₃), containing a C_phenyl, a N_pyridyl, and a N_imidazolyl donor, and their cycloplatinated complexes, [Pt(L₂)Cl] (1), [Pt(L₃)Cl] (2), [Pt(L₂)(PPh₃)]⁺ (3) and [Pt(L₃)(PPh₃)]⁺ (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
Journal	Dalton Transactions
Volume	41
Issue number	6
Online published	13 Dec 2011
DOIs	https://doi.org/10.1039/c1dt11037c
Publication status	Published - 14 Feb 2012

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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 (HL2 and HL3), containing a Cphenyl, a Npyridyl, and a Nimidazolyl donor, and their cycloplatinated complexes, [Pt(L2)Cl] (1), [Pt(L3)Cl] (2), [Pt(L2)(PPh3)]+ (3) and [Pt(L3)(PPh3)]+ (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 = "Yu-Man Ho and Chi-Kin Koo and Ka-Leung Wong and Hoi-Kuan Kong and Chan, \{Chris Tsz-Leung\} and Wai-Ming Kwok and Cheuk-Fai Chow and Lam, \{Michael Hon-Wah\} and Wai-Yeung Wong",

year = "2012",

month = feb,

day = "14",

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 (HL2 and HL3), containing a Cphenyl, a Npyridyl, and a Nimidazolyl donor, and their cycloplatinated complexes, [Pt(L2)Cl] (1), [Pt(L3)Cl] (2), [Pt(L2)(PPh3)]+ (3) and [Pt(L3)(PPh3)]+ (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 (HL2 and HL3), containing a Cphenyl, a Npyridyl, and a Nimidazolyl donor, and their cycloplatinated complexes, [Pt(L2)Cl] (1), [Pt(L3)Cl] (2), [Pt(L2)(PPh3)]+ (3) and [Pt(L3)(PPh3)]+ (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).

UR - https://www.scopus.com/pages/publications/84856703102

UR - https://www.scopus.com/pages/publications/84856703102#tab=impact

U2 - 10.1039/c1dt11037c

DO - 10.1039/c1dt11037c

M3 - RGC 21 - Publication in refereed journal

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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