CN115093549A - 一种侧链含有abno的聚噻吩及其制备方法和应用 - Google Patents
一种侧链含有abno的聚噻吩及其制备方法和应用 Download PDFInfo
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Abstract
本发明公开了一种侧链含有ABNO的聚噻吩及其制备方法和应用,属于电化学技术领域。先以Pd/C为催化剂,9‑苄基‑9‑氮杂双环[3.3.1]壬‑3‑醇在甲醇溶剂中,进行脱苄基反应得到9‑氮杂双环[3.3.1]壬‑3‑醇;然后将9‑氮杂双环[3.3.1]壬‑3‑醇作为原料,以Na2WO4‧2H2O为催化剂,以双氧水为氧化剂,在乙腈溶剂中进行反应,得到9‑氮杂双环[3.3.1]壬‑3‑醇氮氧自由基3‑OH‑ABNO;随后将制备的3‑OH‑ABNO和3‑噻吩乙酸作为反应原料,以二环己基碳二亚胺为脱水剂,以4‑二甲氨基吡啶为催化剂,进行反应得到ThAcOABNO;在四丁基四氟硼酸铵的三氟化硼乙醚溶液中加入ThAcOABNO进行电聚合,电聚合结束后,将工作电极取出,冲洗电极表面,得到附在电极表面的聚合物PThAcOABNO,作为醇的电催化氧化反应的催化剂,具有良好的催化氧化性能。
Description
技术领域
本发明涉及化合物合成技术领域,更具体地说,涉及一种侧链含有ABNO的聚噻吩及其制备方法和应用。
背景技术
稳定的氮氧自由基2,2,6,6-四甲基哌啶氮氧自由基(TEMPO)及其衍生物已经被广泛应用于各类氧化反应中,2-氮杂金刚烷氮氧自由基(AZADO)及其衍生物由于氮氧自由基处位阻较小,在氧化反应中活性比TEMPO高更多,但AZADO类型的氮氧自由基合成步骤长,制备困难。
9-氮杂双环[3.3.1]壬-氮氧自由基(ABNO)具有与AZADO相似的催化活性,但其合成步骤相对简单,容易制备。在电化学或化学氧化反应中,ABNO如果作为均相催化剂使用,一方面反应后不易与产物分离,残留的ABNO会影响产物纯度;另一方面,ABNO不能重复使用,增加了经济和环境成本;因此如何有效地回收ABNO,已经成为ABNO应用的重要研究内容。
导电聚合物是一类需求量很大的材料,因为它们在电子和光学设备、传感器等方面具有广泛的用途。导电聚合物包括在其骨架上包含交替的简单(σ型)和双(π型)碳键或共轭芳香环的有机分子。常见的共轭聚合物包括聚乙炔(PA)、聚噻吩(PT)、聚吡咯(PPy)、聚苯胺(PAn)、聚对亚苯基(PPP)、聚对亚苯基亚乙烯基(PPV)和聚芴(PF)等。导电聚合物可以通过不同的方法合成,其中化学聚合法和电化学聚合法是最常用的方法。
聚噻吩及其衍生物化学结构简单,易于制备,具有高电导率和高稳定性以及聚噻吩具有高度可设计性,易于进行衍生化和功能化(如与非导电聚合物共聚得到复合膜、利用取代基修饰等);聚噻吩及其衍生物是导电聚合物研究领域中一个重要的发展方向。通过不同方法改变聚噻吩的物理化学性质,可将其应用在电催化、电池、光伏材料、电致变色等各个领域。导电聚合物可以通过不同的方法合成,其中化学聚合法和电化学聚合法是最常用的方法。
发明内容
1.要解决的技术问题
针对现有技术中存在的问题,本发明的第一目的在于提供一种侧链含有ABNO的聚噻吩,本发明的另一目的在于提供一种侧链含有ABNO的聚噻吩的制备方法以及其应用。本发明通过将ANBO直接枝接到噻吩聚合物上,使得ABNO在催化电化学氧化反应后可以很方便地从反应体系中分离出来,达到重复使用的目的。
2.技术方案
为解决上述问题,本发明采用如下的技术方案。
为实现第一个发明目的,所采用的技术方案是这样的:
一种侧链含有ABNO的聚噻吩,所述的侧链含有ABNO的聚噻吩PThAcOABNO的结构式如下所示:
上式中,150≥n≥6,n为自然数。
为实现第一个发明目的,所采用的技术方案是这样的:
一种侧链含有ABNO的聚噻吩的制备方法,所述方法包括如下步骤:
S1:以Pd/C为催化剂,常压至0.3MPa的氢气氛围下,9-苄基-9-氮杂双环[3.3.1]壬-3-醇(A)在甲醇溶剂中,在温度为25~75℃的条件下脱苄基反应6~36h,反应结束后过滤反应液,滤液减压浓缩得到9-氮杂双环[3.3.1]壬-3-醇(B);
S2:将步骤S1得到的9-氮杂双环[3.3.1]壬-3-醇(B)作为原料,以浓度为30%的双氧水为氧化剂,乙腈溶剂中室温条件反应8~24h,反应结束后反应液经后处理得到9-氮杂双环[3.3.1]壬-3-醇氮氧自由基(3-OH-ABNO);
S3:将步骤S2中制备的3-OH-ABNO和3-噻吩乙酸(C)在脱水剂二环己基碳二亚胺DCC和催化剂4-二甲氨基吡啶DMAP的作用下进行反应8~24h,反应结束后,反应液经后处理得到ThAcOABNO;
S4:在电化学工作站上进行电聚合反应,采用三电极体系,工作电极为Pt电极,辅助电极为Pt电极,以Ag/Ag+电极作为参比电极,O.1mol/L的硝酸银乙腈溶液作为参比电极溶液;在四丁基四氟硼酸铵的三氟化硼乙醚溶液中,将步骤S3得到的ThAcOABNO加入至四丁基四氟硼酸铵的三氟化硼乙醚溶液中,在室温下进行电聚合,电聚合结束后,将工作电极取出,分别用去离子水和乙腈冲洗电极表面,得到附在电极表面的聚合物PThAcOABNO。
进一步的,所述步骤S1中,Pd/C催化剂与9-苄基-9-氮杂双环[3.3.1]壬-3-醇(A)重量比为5%~20%∶1。
进一步的,所述步骤S1中,Pd/C催化剂的Pd质量百分含量为5%~10%。
进一步的,所述步骤S2中,9-氮杂双环[3.3.1]壬-3-醇(B)与Na2WO4·2H2O的物质的量比为100∶5~15。
进一步的,所述步骤S2中,9-氮杂双环[3.3.1]壬-3-醇(B)与双氧水的物质的量比为100∶300~1000。
进一步的,所述步骤S2中,对反应液进行后处理的方法为:反应结束后,向反应液中加入一定量的水,用二氯甲烷萃取,合并有机相,减压蒸除溶剂,再进行柱层析分离,以乙酸乙酯/石油醚体积比1∶1的混合液为洗脱剂,收集含目标化合物的洗脱液,洗脱液包括洗脱剂和产物3-OH-ABNO,蒸除溶剂即得3-OH-ABNO。
进一步的,所述步骤(3)中,3-OH-ABNO与3-噻吩乙酸(C)、DCC、DMAP的物质的量之比100∶80~120∶100~200∶10~40。
进一步的,所述步骤(3)中,反应液后处理的方法为:反应结束后,过滤反应液,滤液进行减压蒸除溶剂,再进行柱层析分离,以乙酸乙酯/石油醚体积比1∶10的混合液为洗脱剂,收集含目标化合物的洗脱液,洗脱液包括洗脱剂和产物ThAcOABNO,蒸除溶剂即得ThAcOABNO。
进一步的,所述步骤(4)中,四丁基四氟硼酸铵的三氟化硼乙醚溶液的物质的量浓度为0.07~0.14mol/L。
进一步的,所述步骤(4)中,ThAcOABNO加入到四丁基四氟硼酸铵的三氟化硼乙醚溶液中,ThAcOABNO在三氟化硼乙醚溶液中的物质的量浓度为0.008~0.012mol/L。
进一步的,所述步骤S4中,聚合电位为0~1.3V,扫描速度为25mV/s,扫描圈数为4~15圈。
侧链含有ABNO的聚噻吩在醇的电催化氧化反应中作为催化剂的应用。
3.有益效果
相比于现有技术,本发明的优点在于:
(1)本发明通过将ANBO直接枝接到噻吩聚合物上,制备出PThAcOABN,其可以在催化电化学氧化反应后,很方便地从反应体系中分离出来,使得ANBO达到重复使用的目的。
(2)本发明提供的PThAcOABN具有类似ABNO的催化活性,其可作为醇的电催化氧化反应的催化剂,结果表明,其具有良好的催化氧化性能。
附图说明
图1为本发明的PThAcOABNO聚合物膜的扫描电镜图;
图2为本发明的PThAcOABNO聚合物膜的元素Mapping图。
具体实施方式
下面通过具体实施方式对本发明作进一步说明,但本发明的保护范围并不限于此。
实施例1 9-氮杂双环[3.3.1]壬-3-醇(B)的合成
将4.63g 9-苄基-9-氮杂双环[3.3.1]壬-3-醇(A,20mmol)、40mL甲醇和0.45Pd/C(10%Pd)加入到100mL圆底烧瓶,在常压氢气氛围下50℃搅拌反应24小时;反应结束后过滤反应液,滤液减压浓缩得到浅黄色固体9-氮杂双环[3.3.1]壬-3-醇(B)。分离收率73%。
1H NMR(500MHz,CD3OD)δ:3.97-3.90(m,1H),3.29-3.28(m,2H),2.27-2.14(m,3H),1.75-1.68(m,2H),1.51-1.46(m,3H),1.36-1.31(m,2H).13CNMR(125MHz,CD3OD)δ:63.7,46.9,35.9,32.0,15.2。
实施例2 9-氮杂双环[3.3.1]壬-3-醇(B)的合成
反应步骤同实施例1相同,所不同的是Pd/C(10%Pd)用量改为0.30g,氢气压力改为0.25MPa,45℃搅拌反应24小时,9-氮杂双环[3.3.1]壬-3-醇(B)的分离收率为70%。
实施例3 3-OH-ABNO的合成
将2.35g 9-氮杂双环[3.3.1]壬-3-醇(B,16.7mmol)溶解在20mL乙腈中,加入0.56g Na2WO4·2H2O(O.17mmol)和8mL 30%双氧水,室温下搅拌12h;反应结束后,加入一定量的水,用二氯甲烷萃取,合并有机相,减压蒸除溶剂,再进行柱层析分离,以乙酸乙酯/石油醚体积比1∶1的混合液为洗脱剂,收集含目标化合物的洗脱液,蒸除溶剂即得红色固体3-OH-ABNO。分离收率52%。
由于3-OH-ABNO分子中存在自由基,不能直接用核磁表征。高分辨质谱结果(ESI+):m/z,C8H14NO2 ·[M]+计算值156.1019,实验值156.1013。
实施例4 3-OH-ABNO的合成
反应步骤同实施例3相同,所不同的是Na2WO4·2H2O用量改为O.13mmol,30%双氧水用量改为10mL,反应16小时,3-OH-ABNO的分离收率为50%。
实施例5 ThAcOABNO的合成
在250mL两口烧瓶中,加入1.50g 3-OH-ABNO(9.6mmol),1.37g 3-噻吩乙酸(C,9.6mmol),0.29g 4-二甲氨基吡啶(DMAP,2.4mmol),60mL二氯甲烷。充分搅拌后,再加入2.38g二环己基碳二亚胺(DCC,11.5mmol),室温搅拌16h;过滤,减压旋干溶剂,再进行柱层析分离,以乙酸乙酯/石油醚体积比1∶10的混合液为洗脱剂,收集含目标化合物的洗脱液,蒸除溶剂即得红褐色粘稠液体ThAcOABNO。分离收率45%。
高分辨质谱结果(ESI+):m/z,C8H14NO2 ·[M]+计算值280.1002,实验值280.1007。由于ThAcOABNO分子中存在自由基,不能直接用核磁表征,因此将ThAcOABNO用L-抗坏血酸还原后,再用核磁进行表征。1H NMR(500MHz,CDCl3)δ:7.29-7.27(m,1H),7.14(d,J=1.8Hz,1H),7.04-7.03(m,1H),5.44-5.39(m,1H),3.64(s,2H),3.37(d,J=7.0Hz,2H),2.55-2.49(m,2H),1.83-1.78(m,2H),1.55(d,J=11.8Hz,2H),1.31-1.25(m,4H).13C NMR(125MHz,CDCl3)δ:170.5,133.9,128.5,125.8,122.8,65.8,55.4,36.6,31.7,27.9,13.2
实施例6 ThAcOABNO的合成
反应步骤同实施例5相同,所不同的是3-噻吩乙酸(C)的用量改为11.5mmol,DMAP用量改为2.0mmol,DCC用量改为17.3mmol,反应14h,ThAcOABNO的分离收率为53%。
实施例7 PThAcOABNO的制备
电聚合反应在电化学工作站上进行,采用三电极体系,工作电极为Pt电极,辅助电极为Pt电极,Ag/Ag+(0.1mol/L的硝酸银乙腈溶液)电极作为参比电极。在25ml的烧杯内加入0.1mol/L四丁基四氟硼酸铵的三氟化硼乙醚溶液(15mL)和0.15mmol的ThAcOABNO,在室温下进行电聚合。聚合电位为0~1.3V,扫描速度为25mV/s,扫描4圈后,将工作电极取出,分别用去离子水和乙腈冲洗电极表面,得到附在电极表面的聚合物PThAcOABNO。
实施例8 PThAcOABNO的制备
反应步骤同实施例7相同,所不同的是四丁基四氟硼酸铵的乙腈溶液浓度改为0.08mol/L,ThAcOABNO的用量改为0.18mmol,扫描圈数改为8圈,制备得到附在电极表面的聚合物PThAcOABNO。
实施例9 PThAcOABNO的电催化性能
将实施例7中得到的表面包覆有PThAcOABNO的Pt电极记为PThAcOABNO/Pt。电催化氧化反应在电化学工作站上进行,采用三电极体系,工作电极为上述制备的PThAcOABNO,辅助电极为Pt电极,Ag/Ag+(0.1mol/L的硝酸银乙腈溶液)电极作为参比电极。在25ml的烧杯内加入O.1mol/L高氯酸钠的乙腈溶液15mL、1-苯乙醇(0.5mmol)和2,6-二甲基吡啶(0.5mmol);常温,1.5V下恒电位电解,电解6h后气相色谱检测电解液,产物苯乙酮的收率为96%。
实施例10 PThAcOABNO的电催化性能
在实施例8中制备得到的表面包覆有PThAcOABNO的Pt电极记为PThAcOABNO/Pt。电催化性能测试实验步骤同实施例9,苯乙酮的收率为94%。
Claims (10)
2.一种侧链含有ABNO的聚噻吩的制备方法,其特征在于:所述方法包括如下步骤:
S1:以Pd/C为催化剂,在氢气氛围下,9-苄基-9-氮杂双环[3.3.1]壬-3-醇(A)在甲醇溶剂中,进行脱苄基反应得到9-氮杂双环[3.3.1]壬-3-醇(B);
S2:将步骤S1得到的9-氮杂双环[3.3.1]壬-3-醇(B)作为原料,以Na2WO4·2H2O为催化剂,以双氧水为氧化剂,在乙腈溶剂中进行反应,得到9-氮杂双环[3.3.1]壬-3-醇氮氧自由基3-OH-ABNO;
S3:将步骤S2中制备的3-OH-ABNO和3-噻吩乙酸(C)作为反应原料,以二环己基碳二亚胺(DCC)为脱水剂,以4-二甲氨基吡啶(DMAP)为催化剂,进行反应得到ThAcOABNO;
S4:在电化学工作站上进行电聚合反应,采用三电极体系,工作电极为Pt电极,辅助电极为Pt电极,以Ag/Ag+电极作为参比电极,硝酸银乙腈溶液作为参比电极溶液;在四丁基四氟硼酸铵的三氟化硼乙醚溶液中,将步骤S3得到的ThAcOABNO加入至四丁基四氟硼酸铵的三氟化硼乙醚溶液中,在室温下进行电聚合,电聚合结束后,将工作电极取出,冲洗电极表面,得到附在电极表面的聚合物PThAcOABNO。
3.根据权利要求2所述的一种侧链含有ABNO的聚噻吩的制备方法,其特征在于:所述步骤S1中,Pd/C催化剂与9-苄基-9-氮杂双环[3.3.1]壬-3-醇(A)重量比为5%~20%∶1。
4.根据权利要求2所述的一种侧链含有ABNO的聚噻吩的制备方法,其特征在于:所述步骤S1中,Pd/C催化剂的Pd质量百分含量为5%~10%。
5.根据权利要求2所述的一种侧链含有ABNO的聚噻吩的制备方法,其特征在于:所述步骤S2中,9-氮杂双环[3.3.1]壬-3-醇(B)、Na2WO4·2H2O及双氧水的物质的量比为100∶5~15∶300~1000。
6.根据权利要求2所述的一种侧链含有ABNO的聚噻吩的制备方法,其特征在于:所述步骤S3中,3-OH-ABNO与3-噻吩乙酸(C)、DCC、DMAP的物质的量之比100∶80~120∶100~200∶10~40。
7.根据权利要求2所述的一种侧链含有ABNO的聚噻吩的制备方法,其特征在于:所述步骤S4中,四丁基四氟硼酸铵的三氟化硼乙醚溶液的物质的量浓度为0.07~O.14mol/L。
8.根据权利要求2所述的一种侧链含有ABNO的聚噻吩的制备方法,其特征在于:所述步骤S4中,ThAcOABNO加入到四丁基四氟硼酸铵的三氟化硼乙醚溶液中,ThAcOABNO在三氟化硼乙醚溶液中的物质的量浓度为0.008~0.012mol/L。
9.根据权利要求2所述的一种侧链含有ABNO的聚噻吩的制备方法,其特征在于:所述步骤S4中,聚合电位为0~1.3V,扫描速度为25mV/s,扫描圈数为4~15圈。
10.如权利要求1所述的侧链含有ABNO的聚噻吩在醇的电催化氧化反应中作为催化剂的应用。
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