Conjugated Polymer With Tethered Acetylene Groups: Synthesis And Chemical Modification

One unique property of acetylene （≡H） is its binding capability with some metalsby its special chemical activity; this endows acetylene-substituted materials withpotential probing properties toward these metals. Moreover, acetylene is an importantunsaturated group and can be crosslinked between acetylene-acetylene both withthermal and uv light-treatment, which will produce conjugated double bonds oraromatic ring derivatives, thus the efficient conjugation chain length ofacetylene-substituted material will be increased after crosslinking. An effective way tocombined special chemical activity and photoelectric characteristics of conjugatedpolymer is to develop conjugated polymer with tethered acetylene groups.A kind of acetylene-pendant-substituted, carbazole-based blue-light emissionconjugated polymer P-2, were successfully synthesized via protection-deprotectiontwo-step protocols in this paper. Nanodispersion of these conjugated polymers inwater was readily prepared by reprecipitation protocol. Combine signal-amplificationeffect of conjugated polymer, size effect of nanomaterials and complexation betweenacetylene-Hg²⁺, these nanoparticle dispersion detected Hg²⁺successed in water phase(detection limit at¹Ã—10^-6M). Carbazole and acetylene element in P-2have excellentproperties of hole-transporting and crosslinking, which were applied as anti-erosionhole-transport materials （HTM） in multilayer polymer light-emitting diodes （PLEDs）after thermal-treatment. The prelimary analyses indicate that devices s performancewith P-2shows better performance as compared to the conventional hole-transportmaterial, PEDOT: PSS. Using the same method, by introducing copolymerization unitwith different bandwidth into main chain, acetylene-substituted conjugated polymerwith blue-green light （P-4） and red light emission （P-8） have been synthesized.Further functionalized decoration of P-2by Cu+-catalyzed acetylene-azido Clickreaction was carried out under mild condition and fast efficient, and a kind of thymine（T）-substituted polymer （P-5and P-8） was successfully prepared. T-Hg-T complexwas formed in the presence of Hg²⁺, which lead to the alteration of optical propertiesowing to aggregation of polymer chains happened. Optical detection of Hg²⁺caneffectively realized by the gradient process. By the study interference of other metal ions for this kind of probe materials against Hg²⁺one can find that this polymer canact as selective and sensitive Hg²⁺optical probe.