Encapsulation of functional moieties within branched star polymers:: Effect of chain length and solvent on site isolation

被引:160
作者
Hecht, S [1 ]
Vladimirov, N [1 ]
Fréchet, JMJ [1 ]
机构
[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA
关键词
D O I
10.1021/ja003304u
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Porphyrin and pyrene photoactive cores have been encapsulated within an isolating polymeric shell using an efficient and general strategy based on the use of dendritic initiators for the ring-opening polymerization of epsilon -caprolactone to yield functional core star polymers. The isolation of the core functionalities has been studied using fluorescence quenching and fluorescence resonance energy transfer (FRET) techniques as well as solvatochromic probes. With increasing chain length as well as solvent polarity, enhanced site isolation of the core has been observed. These findings have been correlated to actual molecular dimensions independently measured by pulsed field gradient spin-echo (PGSE) NMR. The developed synthetic methodology offers a rapid route to efficient encapsulation of functional moieties and therefore has potential for the design of new materials.
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收藏
页码:18 / 25
页数:8
相关论文
共 102 条
  • [1] Synthesis and steady-state photophysical properties of dye-labeled dendrimers having novel oligothiophene cores:: A comparative study
    Adronov, A
    Malenfant, PRL
    Fréchet, JMJ
    [J]. CHEMISTRY OF MATERIALS, 2000, 12 (05) : 1463 - 1472
  • [2] Light harvesting and energy transfer in laser-dye-labeled poly(aryl ether) dendrimers
    Adronov, A
    Gilat, SL
    Fréchet, JMJ
    Ohta, K
    Neuwahl, FVR
    Fleming, GR
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2000, 122 (06) : 1175 - 1185
  • [3] ALBERTSSON A, 1995, J MACROMOL SCI REV C, V35, P379
  • [4] [Anonymous], 1950, Fluoreszenz organischer Verbindungen
  • [5] Functional cascade molecules
    Archut, A
    Vögtle, F
    [J]. CHEMICAL SOCIETY REVIEWS, 1998, 27 (04) : 233 - 240
  • [6] UNIVERSAL FEATURES OF POLYMER SHAPES
    ARONOVITZ, JA
    NELSON, DR
    [J]. JOURNAL DE PHYSIQUE, 1986, 47 (09): : 1445 - 1456
  • [7] TRANSIENT STUDIES ON INTRAMICELLAR EXCIMER FORMATION - USEFUL PROBE OF THE HOST MICELLE
    ATIK, SS
    NAM, M
    SINGER, LA
    [J]. CHEMICAL PHYSICS LETTERS, 1979, 67 (01) : 75 - 80
  • [8] Shape selective epoxidation of alkenes by metalloporphyrin-dendrimers
    Bhyrappa, P
    Young, JK
    Moore, JS
    Suslick, KS
    [J]. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 1996, 113 (1-2) : 109 - 116
  • [9] Dendrimer-metalloporphyrins: Synthesis and catalysis
    Bhyrappa, P
    Young, JK
    Moore, JS
    Suslick, KS
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1996, 118 (24) : 5708 - 5711
  • [10] Shape-selective ligation to dendrimer-metalloporphyrins
    Bhyrappa, P
    Vaijayanthimala, G
    Suslick, KS
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1999, 121 (01) : 262 - 263