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    Luminescent Amphiphilic 2,6-Bis(1-alkylpyrazol-3-yl)pyridyl Platinum(II) Complexes: Synthesis, Characterization, Electrochemical, Photophysical, and Langmuir-Blodgett Film Formation Studies

    Year: 2010

    Journal: Chemistry--A European Journal (2010), 16(23), 6797-6809, 20121205

    Authors: Zhao, Le; Wong, Keith Man-Chung; Li, Bao; Li, Wen; Zhu, Nianyong; Wu, Lixin; Yam, Vivian Wing-Wah

    Organizations: State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun, PR China.

    Two series of novel platinum(II) 2,6-bis(1-alkylpyrazol-3-yl)pyridyl (N5Cn) complexes, [Pt(N5Cn)Cl][X] (1-9) and [Pt(N5Cn)(C[triple bond]CR)][X] (10-13) (X=trifluoromethanesulfonate (OTf) or PF(6); R=C(6)H(5), C(6)H(4)-p-CF(3) and C(6)H(4)-p-N(C(6)H(5))(2)), with various chain lengths of the alkyl groups on the nitrogen atom of the pyrazolyl units have been successfully synthesized and characterized. Their electrochemical and photophysical properties have been studied. Some of their molecular structures have also been determined by X-ray crystallography. Two amphiphilic platinum(II) 2,6-bis(1-tetradecylpyrazol-3-yl)pyridyl (N5C14) complexes, [Pt(N5C14)Cl]PF(6) (7) and [Pt(N5C14)(C[triple bond]CC(6)H(5))]PF(6) (13), were found to form stable and reproducible Langmuir-Blodgett (LB) films at the air-water interface. The characterization of such LB films has been investigated by the study of their surface pressure-area (pi-A) isotherms, UV/Vis spectroscopy, XRD, X-ray photoelectron spectroscopy (XPS), FTIR, and polarized IR spectroscopy. The luminescence property of 13 in LB films has also been studied.