CN105732679B - 三核稀土簇金属有机骨架材料的制备方法及应用 - Google Patents

三核稀土簇金属有机骨架材料的制备方法及应用 Download PDF

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CN105732679B
CN105732679B CN201610169652.7A CN201610169652A CN105732679B CN 105732679 B CN105732679 B CN 105732679B CN 201610169652 A CN201610169652 A CN 201610169652A CN 105732679 B CN105732679 B CN 105732679B
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韩正波
逄格辉
左荣霞
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Zhejiang Zhiduo Network Technology Co ltd
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Abstract

本发明涉及三核稀土簇金属有机骨架材料的制备方法及应用。采用的技术方案是:将Ln(NO3)3·6H2O,2,6‑萘二酸和邻氟苯甲酸加入到容器内,然后加入N,N‑二甲基甲酰胺,水和浓硝酸,超声均匀;将容器密封后放入烘箱中,105℃下保持3天;缓慢冷却到室温,得到的产物用N,N‑二甲基甲酰胺洗涤,过滤并干燥,最终得到六棱柱状的晶体。本发明所制备的三核稀土簇金属有机骨架材料作为检测Fe3+的荧光探针具有良好的应用性能。

Description

三核稀土簇金属有机骨架材料的制备方法及应用
技术领域
本发明涉及一系列三核稀土簇金属有机骨架材料的制备方法,具体的说,涉及LnIII(Ln=Tb,Eu,Dy,Er,Yb,Gd)和2,6-萘二酸构筑的三核稀土簇金属有机骨架材料作为检测Fe3+的荧光探针。
背景技术
金属有机骨架材料(Metal Organic Frameworks,简称MOFs)作为新型的有机无机杂化材料一直受到广泛的关注。其在离子交换、气体存储、药物传输、荧光探测等方面都有潜在的应用前景。MOFs是一种由金属离子或簇与有机配体通过各种化学键连接构成的高度结晶化的材料,骨架内的功能性位点可以为特异性识别提供平台,这种特有的功能使得MOFs成为一种极具前途的材料。
发明内容
本发明利用三核稀土簇作为节点,2,6-萘二酸(2,6-H2NDC)作为有机配体,在一定的温度下,利用溶剂热的方法合成一系列三核稀土簇金属有机骨架材料。
本发明采用的技术方案是:三核稀土簇金属有机骨架材料的制备方法,包括以下合成步骤:
1)将Ln(NO3)3·6H2O(Ln=Tb,Eu,Dy,Er,Yb,Gd),2,6-H2NDC,邻氟苯甲酸,N,N-二甲基甲酰胺,水和浓硝酸加入到容器内,超声均匀;
2)将容器密封后放入烘箱中,于100-110℃下保持3-5天;
3)缓慢冷却至室温,得到六棱柱状晶体;优选的,所述的缓慢冷却到室温的降温速率为10-15℃·h-1
4)用N,N-二甲基甲酰胺清洗,过滤,干燥,得目标产物。
本发明三核稀土簇金属有机骨架材料的合成路线如图1所示,本发明合成的三核稀土簇金属有机骨架材料的结构如图3所示,该晶体结构属于P-3空间群。分子式为:[Ln33-OH)(2,6-NDC)3(H2O)6]·3DMF·5H2O(Ln=Tb,Eu,Dy,Er,Yb,Gd)。该化合物是由三个具有相同配位模式的LnIII同时结合μ3-OH基团的氧原子形成一个三核簇,三核簇的结构如图2所示,以该三核簇为节点,由2,6-NDC桥联形成了轮浆型的三维孔洞结构,沿c轴方向,该结构的孔道尺寸为
本发明的有益效果是:本发明的三核稀土簇金属有机骨架材料制备方法简单,具有很大的应用前景。所制备的三核稀土簇金属有机骨架材料可以作为检测Fe3+的荧光探针,检测方法具有操作简单和检测限低等特点。
附图说明
图1是本发明三核稀土簇金属有机骨架材料的合成示意图。
图2是本发明三核稀土簇金属有机骨架材料内部三个具有相同配位模式的LnIII(Ln=Tb,Eu,Dy,Er,Yb,Gd)同时结合μ3-OH基团的氧原子构成的一个三核簇的结构图。
图3是本发明三核稀土簇金属有机骨架材料的三维孔洞结构图。
图4是本发明基于EuIII的三核稀土簇金属有机骨架材料荧光发射光谱图。
图5是不同金属离子对本发明基于EuIII的三核稀土簇金属有机骨架材料荧光强度的影响柱状图。
图6是本发明基于EuIII的三核稀土簇金属有机骨架材料加入不同量的Fe3+荧光发射光谱图。
具体实施方式
实施例1基于EuIII的三核稀土簇金属有机骨架材料
将18.9mg的Eu(NO3)3·6H2O,7.0mg的2,6-H2NDC和48.7mg的邻氟苯甲酸加入到5mL容积的耐高温螺旋口的小玻璃瓶内,然后加入2.2mL的N,N-二甲基甲酰胺,0.5mL的水和0.3mL的浓硝酸,超声搅拌30分钟后,将玻璃瓶加盖密封,放入105℃的恒温烘箱中,持续加热72小时,以10-15℃·h-1的降温速率缓慢冷却到室温,得到的产物用N,N-二甲基甲酰胺清洗,过滤,干燥,最终得到六棱柱状的基于EuIII的三核稀土簇金属有机骨架材料,其产率为63%。
本实施例合成的基于EuIII的三核稀土簇金属有机骨架材料的结构如图3所示,该晶体结构属于P-3空间群。分子式为:[Eu33-OH)(2,6-NDC)3(H2O)6]·3DMF·5H2O。该化合物是由三个具有相同配位模式的EuIII同时结合μ3-OH基团的氧原子形成一个三核簇,三核簇的结构如图2所示,以该三核簇为节点,由2,6-NDC桥联形成了轮浆型的三维孔洞结构,沿c轴方向,该结构的孔道尺寸为
实施例2三核稀土簇金属有机骨架材料
方法同实施例1,只是改变Ln离子为Tb,Dy,Er,Yb,Gd,结果如表1所示。
Tb(NO3)3·6H2O Dy(NO3)3·6H2O Er(NO3)3·6H2O Yb(NO3)3·6H2O Gd(NO3)3·6H2O
产率% 64 55 74 59 54
实施例3基于EuIII的三核稀土簇金属有机骨架材料作为荧光探针对金属阳离子进行检测
方法:以实施例1制备的基于EuIII的三核稀土簇金属有机骨架材料作为荧光探针对不同金属阳离子进行选择性检测。
1)图4是基于EuIII的三核稀土簇金属有机骨架材料荧光发射光谱图,图4表明在314nm波长的激发下,该材料出现了红色特征发射,对应于Eu3+离子的5D07FJ(J=1–4)特征跃迁。位于615nm处较强的特征发射源于5D07F2跃迁。
2)取实施例1制备的基于EuIII的三核稀土簇金属有机骨架材料,用研钵研细后与N,N-二甲基甲酰胺配制成200mL浓度为10-4mol/L的悬浊液。分别取20μL浓度均为2.5×10- 2mol/L的不同金属阳离子的硝酸盐M(NO3)n(Mn+=Cd2+、Co2+、Cr3+、Mg2+、Na+、Ni2+、Pb2+、Zn2+、Fe3+)的N,N-二甲基甲酰胺溶液,分别加入到5mL的悬浊液中,搅拌均匀,待体系稳定后进行荧光测试,得到的结果绘制成柱状图如图5所示。由图5可知,本发明的三核稀土簇金属有机骨架材料在N,N-二甲基甲酰胺溶液中表现出良好的荧光性,Cd2+、Co2+、Cr3+、Mg2+、Na+、Ni2+、Pb2+、Zn2+的加入没有使晶体荧光强度发生很明显的变化;当体系中加入Fe3+溶液时,引起晶体荧光的强烈猝灭(78.0%),表明Fe3+对本发明的晶体探针具有很好的选择性,基于此可建立灵敏测定Fe3+的分析方法。
3)为了考察不同浓度Fe3+对体系荧光强度的影响,分别取1μL,3μL,5μL,10μL,15μL,20μL,25μL,30μL浓度为2.5×10-2mol/L的Fe(NO3)3的N,N-二甲基甲酰胺溶液,加入到5mL的上述悬浊液中,搅拌均匀,待体系稳定后进行荧光测试,得到的结果如图6所示。由图6可知,体系的荧光强度会随着Fe3+浓度的增加而有规律的减弱。当体系中加入的Fe3+量为30μL时,体系的猝灭程度达到94%,表明Fe3+对本发明的晶体探针具有很好的选择性,在检测体系中含有的Fe3+方面具有很好的效果;而且检测方法操作简单、检测限低,检测结果令人满意。

Claims (3)

1.三核稀土簇金属有机骨架材料,其特征在于:所述的三核稀土簇金属有机骨架材料的制备方法包括以下合成步骤:
1)将Ln(NO3)3,2,6-H2NDC,邻氟苯甲酸,N,N-二甲基甲酰胺,水和浓硝酸加入到容器内,超声均匀;
2)将容器密封后放入烘箱中,于温度100-110℃下保持3-5天;
3)缓慢冷却至室温,得到中间产物;
4)用N,N-二甲基甲酰胺溶液清洗,过滤并干燥,得目标产物;
所述的三核稀土簇金属有机骨架材料属于P-3空间群,分子式为:[Ln33-OH)(2,6-NDC)3(H2O)6]·3DMF·5H2O,是由三个具有相同配位模式的LnIII同时结合μ3-OH基团的氧原子形成一个三核簇,以该三核簇为节点,由2,6-NDC桥联形成了轮浆型的三维孔洞结构,沿c轴方向,孔道尺寸为
所述的Ln=Tb、Eu、Dy、Er、Yb或Gd;
所述的缓慢冷却至室温的降温速率为10-15℃·h-1
2.权利要求1所述的三核稀土簇金属有机骨架材料作为荧光探针在检测体系中含有的Fe3+中的应用。
3.根据权利要求2所述的应用,其特征在于方法如下:于含有Fe3+的溶液中,加入权利要求1所述的三核稀土簇金属有机骨架材料的N,N-二甲基甲酰胺溶液,常温下搅拌均匀,进行荧光检测。
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