Cyclometalated Platinum(II) Complexes of 1,3-Bis(1-n-butylpyrazol-3-yl)benzenes: Synthesis, Characterization, Electrochemical, Photophysical, and Gelation Behavior Studies.
A 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)(C≡C-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 some3MLCT [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.
Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University , Guangzhou 510275, P. R. China.|Institute of Molecular Functional Materials [Areas of Excellence Scheme, University Grants Committee (Hong Kong)] and Department of Chemistry, The University of Hong Kong , Pokfulam Road, Hong Kong, P. R. China.
Yeye
Y
Ai
Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University , Guangzhou 510275, P. R. China.
Yongguang
Y
Li
Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University , Guangzhou 510275, P. R. China.
Huiqing
H
Ma
Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University , Guangzhou 510275, P. R. China.
Cheng-Yong
CY
Su
Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University , Guangzhou 510275, P. R. China.|Institute of Molecular Functional Materials [Areas of Excellence Scheme, University Grants Committee (Hong Kong)] and Department of Chemistry, The University of Hong Kong , Pokfulam Road, Hong Kong, P. R. China.
Vivian Wing-Wah
VW
Yam