首页|Tunable circularly polarized luminescence of sol-gels based on chiral cyclometalated platinum(II)complexes
Tunable circularly polarized luminescence of sol-gels based on chiral cyclometalated platinum(II)complexes
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NSTL
Two couples of enantiomeric pinene-containing N^C^N and CTSTN-coordinated Pt(II)isocyanide complexes decorated with long alkyl chains have been prepared and characterized.Complexes(-)-l and(-)-2 form chiral ordered self-assemblies through Pt···Pt,π-π,and hydrophobic-hydrophobic interactions in nonpolar solvents,which is manifested by scanning electron and confocal microscope studies.Complexes(-)-l and(-)-2 display appreciable aggregation-induced emission enhancement behavior in the CH2Cl2/n-hexane system with the emission quantum yield(Φ_(em))intensified by a factor of twenty.The complexes exhibit thermo-responsive sol-to-gel transition and solvent-tuned emission colors in higher alcohols or alkane solvents.Considerable circularly polarized luminescence(CPL)signals deriving from chiroptically active ~3MMLCT transition with the g_(lum)value of 10~2 order have been found for most sols at RT.Despite minor structural variations in complexes(-)-l and(-)-2,the CPL activity of Pt(N^C^N)isocyanide complex(-)-1 is more sensitive to solvent and temperature.In contrast,the CPL activity of Pt(N^N^C)isocyanide complex(-)-2 is inert to external factors.This research provides a new design strategy for developing tunable CPL platinum(II)complex sol-gels.
College of Chemistry and Chemical Engineering,Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province,Hainan Normal University,Haikou,571158,China
NSTL
