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- W2036729665 abstract "Imidazole-terminated first- and second-generation poly(amidoamine)-type oligomeric silsesquioxanes (POSS)-core dendrimers (denoted as POSS-Im16 and POSS-Im32, respectively) were synthesized by the ester–amide exchange reaction from first- and second-generation methyl ester-terminated POSS-core dendrimers, respectively. Transmittances of the aqueous POSS-Im32 solution drastically decreased at pH>7.2, but the change was reversible without hysteresis. The results of pH titrations for POSS-Im16 and POSS-Im32 showed well-defined one-step titration curves identical to those of monomeric imidazole compounds, such as 1-methylimidazole. Such simple acid–base behavior caused phase transition in the aqueous dendrimer solution to be highly sensitive to pH changes. The pKa values of 1-methylimidazole, POSS-Im16 and POSS-Im32 were 7.3, 7.0 and 6.7, respectively. Spectrophotometric titrations of the aqueous dendrimer solutions with Cu2+ ions indicated that coordination modes of POSS-Im16 changed from the Cu2+–N2O2 complex to the Cu2+–N4 complex as the concentration of the dendrimers increased; however, only one complexation mode (Cu2+–N4) existed between Cu2+ ions and POSS-Im32. Imidazole-terminated first- and second-generations poly(amidoamine)-typed POSS-core dendrimers denoted as POSS-Im16 and POSS-Im32, respectively, were synthesized. The results of pH titrations for the dendrimers showed well-defined one-step titration curves as same as that of 1-methylimidazole as a monomeric imidazole compound. Spectrophotometric titrations of the dendrimer aqueous solutions with Cu2+ ions indicated variation of the coordination modes of POSS-Im16 from the Cu2+–N2O2 complex to the Cu2+–N4 complex and the existence of the only one complexation mode of Cu2+–N4 between Cu2+ ion and POSS-Im32 with increasing concentrations of the dendrimers." @default.
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- W2036729665 date "2012-01-18" @default.
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- W2036729665 title "Synthesis of first- and second-generation imidazole-terminated POSS-core dendrimers and their pH responsive and coordination properties" @default.
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- W2036729665 doi "https://doi.org/10.1038/pj.2011.145" @default.
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