Synthesis and characterization of terminalalkynyl-substituted unsymmetrical zinc phthalocyanine conjugated with well-defined polymers
摘要:
Synthesis of unsymmetrically terminalalkynyl substituted zinc (II) phthalocyanine (ZnPc) through an efficient statistical condensation reaction with the unprotected phthalonitrile (2) is reported for the first time. Isolated ZnPc bearing one terminalalkynyl group is a good precursor for Cu(I)-catalyzed azide-alkyne 1,3-dipolar cycloaddition (CuAAC) reaction which is classified under the term "click chemistry". This was approved by the successful click reaction between ZnPc and azide end-functional well-defined polymers obtained by atom transfer radical polymerization (ATRP), and consecutive azidation of corresponding bromo end-functional polymers. The click-reaction efficiencies for the formation of Pc-end functional poly(tert-butyl acrylate) (PtBA), and polystyrene (PS) have been found to be 75, 93% respectively. Functionalization of ZnPc with PS increased the chemical stability of the complex but decreased the electrochemical reversibility during redox reactions. In-situ electrocolorimetric measurements of the complexes allowed the quantification of color coordinates of the each electrogenerated anionic and cationic redox species. (C) 2013 Elsevier Ltd. All rights reserved.
第一次,对称的四末端炔基取代的酞菁(Pcs)被聚合物官能化,即通过1,3-偶极环加成反应。为此目的,通过4-硝基邻苯二甲腈(1)和4-戊炔-1-醇(2)的亲核取代反应来制备4-戊-4-炔氧基-邻苯二甲腈(3)。靶2,9的(10)(17)的合成,16,23(24) -四终端炔基-取代的酞菁(4 - 6)用合理的产率通过一个直接cyclotetramerization反应中的乙酸锌存在下实现的,戊醇中的乙酸钴和/或DBU,无保护/脱保护。定义明确的叠氮基封端的聚苯乙烯(PS-N)之间的成功“点击”反应3)(7)或聚(丙烯酸叔丁酯)(P t BA-N 3)(8)和炔基封端的酞菁(4、5)产生四臂星形聚合物。通过1 H NMR,13 C NMR,FT-IR,UV-Vis,GPC和元素分析对前驱物和目标星形聚合物进行了全面表征。