9-Allylcarbazole → Carbazole

Participants

Reaction Steps

To a solution of 868 mg (0.853 mmol) of POSS and 447 mg (0.853 mmol) FPt-6 in 20 mL anhydrous toluene was added 4 drops of a solution of Platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane (Pt(dvs)) (2 wt. % Pt in xylene). The reaction mixture was stirred at room temperature for 1 hour and then 1.765 g (8.53 mmol) of N-allylcarbazole was added and the reaction mixture was stirred for an additional 16 hours. The reaction mixture was then precipitated out of cold methanol and filtered through a silica plug using dichloromethane as the eluent to give a mixture of lumophore/host functionalized nanoparticles. The reaction mixture was purified chromatographically and three products, (POSS)(carbazole host)8, (POSS)(FPt-6)1(carbazole host)7 and (POSS)(FPt-6)2(carbazole)6 were separately isolated. The structures of the three products were confirmed by MALDI-TOF mass spectrometry. FIG. 7 shows the photoluminescent spectra of (POSS)(FPt-6)1(carbazole host)7 (POSS 61) and (POSS)(FPt-6)2(carbazole)6 (POSS 62). The photoluminescent spectrum of POSS 61 covers a broader region of the visible spectrum compared to that of POSS 62, and thus is a better material for a white-light emitting device. The CIE coordinates for POSS 61 and POSS 62 were (x=0.42, y=0.43) and (x=0.51, y=0.45), respectively, as shown in FIG. 8. As can be seen by FIG. 8, POSS 61 has CIE coordinates that is closer to the achromatic point (which represent the coordinates for white light) and a higher color rendering index (CRI) value. The CRI is a measure of the ability of a light source to reproduce the colors of various objects being lit by the source. The best possible rendition of colors is specified by a CRI of 100, while the very poorest rendition is specified by a CRI of 0.

Provenance & Evidence