CN107573366B - 邻羧基苯甲醛缩1,3-丙二胺席夫碱铜配合物的制备方法 - Google Patents

邻羧基苯甲醛缩1,3-丙二胺席夫碱铜配合物的制备方法 Download PDF

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CN107573366B
CN107573366B CN201710837110.7A CN201710837110A CN107573366B CN 107573366 B CN107573366 B CN 107573366B CN 201710837110 A CN201710837110 A CN 201710837110A CN 107573366 B CN107573366 B CN 107573366B
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刘峥
李海莹
王浩
黄何香
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Guilin University of Technology
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Abstract

本发明公开了一种邻羧基苯甲醛缩1,3‑丙二胺席夫碱铜配合物的制备方法。以邻羧基苯甲醛和乙二胺为原料,冰醋酸为催化剂,无水甲醇为溶剂,经溶液法制备邻羧基苯甲醛缩1,3‑丙二胺席夫碱;再以邻羧基苯甲醛缩1,3‑丙二胺席夫碱和一水合乙酸铜为原料,无水甲醇为溶剂,经水热法制备邻羧基苯甲醛缩1,3‑丙二胺席夫碱铜配合物。本发明方法具有工艺简单、重现性好、产率较高的优点。且制得的邻羧基苯甲醛缩1,3‑丙二胺席夫碱及其铜配合物均具有荧光性质,在荧光探针,荧光分析领域具有潜在的应用价值。

Description

邻羧基苯甲醛缩1,3-丙二胺席夫碱铜配合物的制备方法
技术领域
本发明涉及一种双席夫碱,具体涉及一种邻羧基苯甲醛缩1,3-丙二胺席夫碱铜配合物的制备方法。
背景技术
席夫碱是由含伯氨基与活泼羰基的两类物质通过缩合反应生成的含有亚胺(―CH=N―)或甲亚胺(―CR=N―)基团的一类化合物。席夫碱按不同分类方法有不同的类型,按构造式划分,可分为单席夫碱、双席夫碱、大环类席夫碱、杂环席夫碱等;按基团配位模式划分,可分为缩胺类、缩酮类等;按配位金属的不同可分为单核、多核等。由于席夫碱分子中含有C=N键,不仅含有不饱和双键,氮原子还能提供孤对电子,所以其具有较强的反应活性,能够对取代基给予体的类型和位置进行不同的转变,从而能够衍生出功能不同、构造多变的席夫碱及其配合物。
席夫碱因其结构特点在诸多领域具有重要的研究价值,是近年来科学工作者研究的热点之一。其中缩氨基脲类、吡唑类、酰腙类、酰肼类的席夫碱研究的比较多,特别是水杨醛类、含多羟基类的席夫碱,而含羧基的双席夫碱目前鲜有报道。芳香族双席夫碱类化合物,含有共轭大π键,可有效的吸收紫外光,从而使物质具有一定的荧光性质。含羧基的配体配位模式相对灵活,除能提高配位能力外,还具有结构稳定等特点。由于结构的独特性,使这类席夫碱受到人们的广泛关注。
本申请利用邻羧基苯甲醛与1,3-丙二胺反应合成了一种新型双席夫碱,以该双席夫碱为配体合成了一种铜配合物,并研究了该席夫碱和铜配合物的荧光性质。
发明内容
本发明的目的是提供一种邻羧基苯甲醛缩1,3-丙二胺席夫碱铜配合物的制备方法。
具体步骤为:
(1)称取1.5000 g(10.0 mmol)邻羧基苯甲醛和10 mL无水甲醇,加入到100 mL的三口烧瓶中,磁力搅拌,制得无色透明清液。
(2)称取0.3700 g(5.0 mmol)1,3-丙二胺溶入5 mL无水甲醇中,得到的溶液滴加到步骤(1)制得的无色透明清液中,滴加完毕后,加入0.15 mL冰醋酸作为催化剂,在氮气保护、50 ℃下,回流搅拌反应4小时,有大量白色沉淀生成,趁热过滤,获得沉淀和滤液,将该沉淀先后采用打浆法、重结晶法进行提纯,真空干燥,即制得邻羧基苯甲醛缩1,3-丙二胺席夫碱粉体;所述打浆法用无水甲醇为溶剂,所述重结晶法使用体积比为1:1的N,N-二甲基甲酰胺(DMF)和无水甲醇混合溶剂。
(3)取步骤(2)中获得的滤液,在室温下静置自然挥发,一天后有白色透明片状晶体析出;过滤,无水甲醇洗涤,真空干燥,即制得邻羧基苯甲醛缩1,3-丙二胺席夫碱晶体。
(4)称取0.0676 g(0.2 mmol)步骤(2)中制得的邻羧基苯甲醛缩1,3-丙二胺席夫碱粉体,溶于5 mL无水甲醇中,室温磁力搅拌下,缓慢滴加含有0.0399 g(0.2 mmol)一水合乙酸铜的5 mL甲醇溶液,搅拌1小时后,转入带有聚四氟乙烯瓶的反应釜中,放入100 ℃烘箱中,2小时之后关闭烘箱,缓慢冷却至室温,过滤,其滤液在室温下静置自然挥发,15天后析出蓝色片状晶体,再过滤,依次用DMF和无水甲醇分别洗涤3次,每次DMF和无水甲醇的用量均为10 mL,再放入30 ℃真空干燥箱中,干燥24小时,即制得邻羧基苯甲醛缩1,3-丙二胺席夫碱铜配合物晶体。
本发明方法具有工艺简单、重现性好、产率较高的优点。且制得的邻羧基苯甲醛缩1,3-丙二胺席夫碱及其铜配合物均具有荧光性质,在荧光探针、荧光分析领域具有潜在的应用价值。
附图说明
图1 为本发明实施例中制得的邻羧基苯甲醛缩1,3-丙二胺席夫碱的晶体结构图。
图2 为本发明实施例中制得的邻羧基苯甲醛缩1,3-丙二胺席夫碱铜配合物的晶体结构图。
图3为本发明实施例中制得的邻羧基苯甲醛缩1,3-丙二胺席夫碱的荧光光谱。
图4为本发明实施例中制得的邻羧基苯甲醛缩1,3-丙二胺席夫碱铜配合物的荧光光谱。
具体实施方式
实施例:
(1)称取1.5000 g(10.0 mmol)邻羧基苯甲醛和10 mL无水甲醇,加入到100 mL的三口烧瓶中,磁力搅拌,制得无色透明清液。
(2)称取0.3700 g(5.0 mmol)1,3-丙二胺溶入5 mL无水甲醇中,得到的溶液滴加到步骤(1)制得的无色透明清液中,滴加完毕后,加入0.15 mL冰醋酸作为催化剂,在氮气保护、50 ℃下,回流搅拌反应4小时,有大量白色沉淀生成,趁热过滤,获得沉淀和滤液,将该沉淀先后采用打浆法、重结晶法进行提纯,真空干燥,即制得邻羧基苯甲醛缩1,3-丙二胺席夫碱粉体;所述打浆法用无水甲醇为溶剂,所述重结晶法使用体积比为1:1的N,N-二甲基甲酰胺(DMF)和无水甲醇混合溶剂。
(3)取步骤(2)中获得的滤液,在室温下静置自然挥发,一天后有白色透明片状晶体析出;过滤,无水甲醇洗涤,真空干燥,即制得邻羧基苯甲醛缩1,3-丙二胺席夫碱晶体。
(5)称取0.0676 g(0.2 mmol)步骤(2)中制得的邻羧基苯甲醛缩1,3-丙二胺席夫碱粉体,溶于5 mL无水甲醇中,室温磁力搅拌下,缓慢滴加含有0.0399 g(0.2 mmol)一水合乙酸铜的5 mL甲醇溶液,搅拌1小时后,转入带有聚四氟乙烯瓶的反应釜中,放入100 ℃烘箱中,2小时之后关闭烘箱,缓慢冷却至室温,过滤,其滤液在室温下静置自然挥发,15天后析出蓝色片状晶体,再过滤,依次用DMF和无水甲醇分别洗涤3次,每次DMF和无水甲醇的用量均为10 mL,再放入30 ℃真空干燥箱中,干燥24小时,即制得邻羧基苯甲醛缩1,3-丙二胺席夫碱铜配合物晶体。
通过单晶 X-射线衍射对本实施例制得的邻羧基苯甲醛缩1,3-丙二胺席夫碱和邻羧基苯甲醛缩1,3-丙二胺席夫碱铜配合物的晶体结构进行解析。由附图1可知,邻羧基苯甲醛缩1,3-丙二胺席夫碱是由一个1,3-丙二胺分子和两个邻羧基苯甲醛发生缩合反应,脱掉2个水分子得到,结构含有一个游离的甲醇分子。由于反应条件的特异性,邻羧基苯甲醛双席夫碱中的一个C=N双键与邻位―COOH反应成环,其氮原子又与另一个C=N双键反应成环,从而形成了一个新型四环化合物。由附图2可知,邻羧基苯甲醛缩1,3-丙二胺席夫碱铜配合物是由一个铜离子和一个(L1)2-配体、一个甲醇分子构成。在邻羧基苯甲醛缩1,3-丙二胺席夫碱铜配合物中,根据分子电中性可知,中心铜离子为+2价。铜离子处于五配位环境中,它由来自同一个邻羧基苯甲醛缩1,3-丙二胺席夫碱配体的两个氧原子和两个氮原子,以及来自一个甲醇分子的氧原子配位,形成了一个五配位的四方锥CuO3N2构型。配位原子N1,N2,O1,O3与中心铜离子形成的键角之和为359.04°,接近理想的360°,说明四个配位原子处于四方锥的赤道平面,且共面性好。
利用日本日立高科技公司的F-4600型荧光光谱仪,以DMF为参比液,在室温下对本实施例制得的邻羧基苯甲醛缩1,3-丙二胺席夫碱及其铜配合物的DMF溶液(浓度为1.0×10-5 mol/L)的荧光发射光谱(激发和发射狭缝宽度各为10 nm)进行测试,结果表明,邻羧基苯甲醛缩1,3-丙二胺席夫碱及其铜配合物能发射荧光,其中邻羧基苯甲醛缩1,3-丙二胺席夫碱最大发射波长为333 nm,其激发波长为299 nm,而铜配合物的最大发射波长为327 nm,其激发波长为310 nm。附图3和附图4为邻羧基苯甲醛缩1,3-丙二胺席夫碱及其铜配合物的荧光光谱。邻羧基苯甲醛缩1,3-丙二胺席夫碱的发射荧光可归因于配体π-π*电子转移跃迁。铜配合物发射荧光可归因于配体与金属离子之间发生LMCT或MLCT的电子转移跃迁或配体π-π*电子转移跃迁。配合物和配体相比,其发射波长均发生不同程度的蓝移,可能是因为配体与金属离子配位后,导致HOMO-LUMO能级差增大。配合物的荧光强度较其对应的配体变化不明显,可能是因为金属离子配位后并没有对配体的共轭程度产生较大的影响。

Claims (1)

1.一种邻羧基苯甲醛缩1,3-丙二胺席夫碱铜配合物的制备方法,其特征在于具体步骤为:
(1)称取10.0 mmol邻羧基苯甲醛和10 mL无水甲醇,加入到100 mL的三口烧瓶中,磁力搅拌,制得无色透明清液;
(2)称取5.0 mmol的1,3-丙二胺溶入5 mL无水甲醇中,得到的溶液滴加到步骤(1)制得的无色透明清液中,滴加完毕后,加入0.15 mL冰醋酸作为催化剂,在氮气保护、50 ℃下,回流搅拌反应4小时,有大量白色沉淀生成,趁热过滤,获得沉淀和滤液,将该沉淀先后采用打浆法、重结晶法进行提纯,真空干燥,即制得邻羧基苯甲醛缩1,3-丙二胺席夫碱粉体;所述打浆法用无水甲醇为溶剂,所述重结晶法使用体积比为1:1的N,N-二甲基甲酰胺和无水甲醇混合溶剂;
(3)取步骤(2)中获得的滤液,在室温下静置自然挥发,一天后有白色透明片状晶体析出;过滤,无水甲醇洗涤,真空干燥,即制得邻羧基苯甲醛缩1,3-丙二胺席夫碱晶体;
(4)称取0.2 mmol步骤(2)中制得的邻羧基苯甲醛缩1,3-丙二胺席夫碱粉体,溶于5 mL无水甲醇中,室温磁力搅拌下,缓慢滴加含有0.2 mmol一水合乙酸铜的5 mL甲醇溶液,搅拌1小时后,转入带有聚四氟乙烯瓶的反应釜中,放入100 ℃烘箱中,2小时之后关闭烘箱,缓慢冷却至室温,过滤,其滤液在室温下静置自然挥发,15天后析出蓝色片状晶体,再过滤,依次用N,N-二甲基甲酰胺和无水甲醇分别洗涤3次,每次N,N-二甲基甲酰胺和无水甲醇的用量均为10 mL,再放入30 ℃真空干燥箱中,干燥24小时,即制得邻羧基苯甲醛缩1,3-丙二胺席夫碱铜配合物晶体。
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