中文摘要：

探讨了聚（3-己基噻吩）-b-聚（2,3-喹喔啉）（P3HT-b-PQD）共轭嵌段聚合物对二价钴离子的高选择性可视化检测.该类结构明确的嵌段共聚物以Ni（dppp）Cl2为引发剂,通过顺序投料的＂一锅法＂活性配位聚合方法合成,其四氢呋喃溶液呈黄色,在365 nm的紫外光照射下发出橙黄色的荧光.该类嵌段聚合物可以实现对二价钴离子的可视化检测,加入二价钴离子后,其四氢呋喃溶液的颜色由黄色变为亮绿色.检测具有非常高的选择性,加入其它的金属离子不能产生溶液颜色的任何变化.此外,加入二价钴离子后,其四氢呋喃稀溶液在紫外下的发射光由橙黄色变为深绿色.其对于二价钴离子的检测限可达10^-7mol/L.竞争实验表明,其它金属离子对于钴离子的识别不具有任何干扰.

英文摘要：

Well-defined poly（ 3-hexylthiophene）-b-poly（ quinoxaline-2,3-diyl）（ P3HT-b-PQD） conjugated block copolymer was readily synthesized in one pot via mechanistically distinct,sequential living block copolymerization with Ni（ dppp） Cl2 as a single catalyst at room temperature. The P3HT-b-PQD block copolymer gives yellow color in THF and exhibits strong light emission under UV irradiation at 365 nm. It was found that the synthesized P3HT-b-PQD copolymer can visually detect Co2 ＋in THF by changing its color from yellow to light green. The detection is of high selectivity as the addition of other metal ions did not induce any change on the solution color,including Pb^2＋,Na^＋,Al^3 ＋,K＋,Mn^2＋,Fe^2 ＋,Fe^3 ＋,Zn^2＋,Ni^2 ＋,Ag^＋,Cu^＋,Cu^2 ＋,Eu^3 ＋,Cd^2 ＋,Mg^2 ＋,Ca^2＋,Cs^＋,Ba^2＋,Hg^2 ＋and Pd^2 ＋. Moreover,the P3HT-b-PQD exhibits highly selective fluorescent senses of Co2 ＋over most of competing ions by changing its orange light emission to deep green in diluted THF solution. The detection limit of Co2 ＋by this P3HT-b-PQD block copolymer can be down to 10^- 7mol / L. Further investigation revealed that the interference of other competing transition metal ions on the visual detection of Co2 ＋is negligible. Such visual detection of Co2 ＋by P3HT-b-PQD block copolymer can be put into practical applications by using test strips and thin films,making it a practical,convenient and highly selective visual cobalt probe by naked-eye. Transmission electron microscopy（ TEM） observation indicated the P3HT-b-PQD was self-assembled into core-shell supramolecular structures upon coordinated with Co2 ＋ions.