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Cyclometalated Platinum(II) Complexes of 1,3-Bis(1‑n‑butylpyrazol-3-yl)benzenes: Synthesis, Characterization, Electrochemical, Photophysical, and Gelation Behavior Studies
journal contribution
posted on 2016-11-02, 13:04 authored by Yeye Ai, Yongguang Li, Huiqing Ma, Cheng-Yong Su, Vivian Wing-Wah YamA new series of cyclometalated platinum(II) complexes of N^C^N ligands,
where N^C^N = 1,3-bis(1-n-alkylpyrazol-3-yl)benzene
(bpzb), namely, [Pt(bpzb)Cl] (1 and 2) and
[Pt(bpzb)(CC–R)] (3–10) (R = C6H5, C6H4–OCH3-p, C6H4–NO2-p, C6H4–NH2-p, 4-cholesteryl phenyl carbamate, and cholesteryl
methylcarbamate) were synthesized and characterized. Their electrochemical
and photophysical properties were investigated. Two of the platinum(II)
complexes were also structurally characterized by X-ray crystallography,
and short intermolecular C–H···Pt contacts were
observed. Vibronic-structured emission bands originating from triplet
IL (3IL) excited states of the bpzb ligands with mixing
of some 3MLCT [dπ(Pt)→π*(bpzb)] character
were observed in solution state. Interestingly, complex 5 shows a low-energy emission that is derived from the involvement
of the p-nitrophenylethynyl ligand. Complex 9 with hydrophobic cholesteryl 4-ethynylphenyl carbamate ligand
was found to form stable metallogels in several organic solvents,
which are responsive to mechanical sonication and thermal stimuli
and show circular dichroism activity.
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cholesteryl 4- ethynylphenyl carbamate ligandC 6 H 5triplet ILdichroism activityalkylpyrazol -3-ylcholesteryl methylcarbamateOCHPtNHComplex 9Vibronic-structured emission bands3 ILphotophysical propertiessolution stateGelation Behavior Studiesbpzb ligandsX-ray crystallography4- cholesteryl phenyl carbamatenitrophenylethynyl ligandcomplex3 MLCTlow-energy emission
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