CN108047279B - 一种Zn(II)/Na(I)配合物单晶及其制备方法和应用 - Google Patents

一种Zn(II)/Na(I)配合物单晶及其制备方法和应用 Download PDF

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CN108047279B
CN108047279B CN201711467358.5A CN201711467358A CN108047279B CN 108047279 B CN108047279 B CN 108047279B CN 201711467358 A CN201711467358 A CN 201711467358A CN 108047279 B CN108047279 B CN 108047279B
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刘雷雷
余彩霞
邢云
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Abstract

本发明属配位化学领域,涉及一种可以检测水中Cu2+含量的杂核Zn(II)/Na(I)配合物单晶及其制备方法。其化学式为:{[Zn2Na(L)(HL)2(H2O)2][OAc]∙2H2O},其中H2L代表5‑甲基间苯二甲酸;属于正交晶系,空间群为Pnma,a=7.3813(15)Å,b=23.846(5)Å,c=18.810(4)Å,α=90°,β=90°,γ=90°,V=3310.8(12)Å3。该配合物单晶检测水中Cu2+浓度时具有较宽的检测范围和较低的检测限,稳定性好。用于水中Cu2+的检测具有很好的应用前景。

Description

一种Zn(II)/Na(I)配合物单晶及其制备方法和应用
技术领域
本发明涉及配位化学和检测领域,具体涉及一种可以检测水中Cu2+含量的杂核Zn(II)/Na(I)配合物单晶及其制备方法。
背景技术
Cu2+作为一种重金属,它是动植物和人类必需的微量元素之一。微量Cu2+能够促进动植物的生长发育,然而,过量摄入就会出现受害症状、生理受阻、发育停滞、甚至死亡。但是,随着人类社会和工业的快速增长,铜在电力设备、可再生能源、工业机械和建筑施工等领域广泛应用,导致Cu2+大量排放,给生物带来了许多严重的不良影响。因此,世界卫生组织(WHO)已经将饮用水中的Cu2+浓度限制在2ppm。因此对饮用水中铜的监测和控制具有重要意义。
基于此,广大化学家开发了许多新颖的能够检测Cu2+的方法。荧光分析由于具有响应速度短、操作简便、灵敏度高、选择性好等特点,人们致力于构建各种荧光分析传感器。近年研究表明,具有微孔结构的功能配合物可应用于检测水中Cu2+的浓度。这类功能配合物具有较大的比表面积,永久的孔隙度,可调节的化学功能,精细可调的孔结构,特别是,各种官能团可以合理地引入金属配体修饰微孔结构,从而产生更多的活性位点应用于检测重金属离子(J.Mater.Chem.A,2013,1,11043-11050)。通过调研文献,我们发现,这类功能配合物有些在水中不能够稳定存在,它们检测Cu2+浓度是在有机溶剂中进行的,从而限制了其实际应用(Chem.Commun.,2014,50,13567-13570)。因此,设计合成适用范围宽的新型功能配合物传感器有利于Cu2+浓度的检测。
发明内容
本发明目的在于提供一种灵敏度高、检测范围宽,稳定性好且使用便捷的功能配合物,作为检测Cu2+传感器。另一目的在于提供其制备方法。
为实现本发明目的,本发明合成了杂核Zn(II)/Na(I)配合物单晶。
其化学式为:{[Zn2Na(L)(HL)2(H2O)2][OAc]·2H2O},其中H2L代表5-甲基间苯二甲酸;属于正交晶系,空间群为Pnma,
Figure BDA0001529404980000011
Figure BDA0001529404980000021
α=90°,β=90°,γ=90°,
Figure BDA0001529404980000022
本发明所述传感器的制备方法:将二水合醋酸锌、配体5-甲基间苯二甲酸与氢氧化钠水溶液加入到乙腈和水中,封入聚四氟乙烯的钢制反应釜中,在溶剂热法条件下,160-170℃恒温两天,以4-5℃/h的速率缓慢降温,降至室温后,得到目标产物,即为Zn(II)/Na(I)配合物单晶传感器。
制备方法中二水合醋酸锌:5-甲基间苯二甲酸:氢氧化钠的摩尔比例是1.5-2:1:1。
制备方法中乙腈和水的体积比是20-25:1。
该配合物可以作为传感器应用于检测水中Cu2+浓度。
本发明优点在于:该Zn(II)/Na(I)配合物单晶不仅能够在水中稳定存在,并且在它的三维框架结构的孔道内中存在乙酸阴离子,这有利于与Cu2+作用,进而快速、灵敏地检测水中Cu2+浓度。检测水中Cu2+浓度时具有较宽的检测范围(0.5-1200μM)、较低的检测限(0.65μM)和较短的响应时间(1分钟)。在180℃下和水中能够稳定存在,稳定性好,使用便捷。另外,本发明制备工艺简单,收率较高,达29%以上。
附图说明
图1为本发明Zn(II)/Na(I)配合物晶体中Zn(II)和Na(I)的配位环境图;
图2为本发明传感器的单晶结构图;
图3为本发明传感器的变温粉末衍射图谱、单晶模拟粉末衍射图谱对比图;其中,30℃、50℃、100℃、120℃、140℃、160℃、180℃为不同温度下本发明传感器的粉末衍射图谱;1为单晶模拟粉末衍射图谱;
图4为本发明传感器在水中稳定性的粉末衍射图谱;1为单晶模拟粉末衍射图谱,2为本发明传感器在水中浸泡24小时后粉末衍射图谱;
图5为本发明传感器检测水中Cu2+浓度的荧光强度变化图(激发峰:305nm,发射峰:325-600nm);
图6为本发明传感器检测水中Cu2+浓度的线性范围。
具体实施方式
下面通过实例对本发明做进一步的说明:
实施例1:合成Zn(II)/Na(I)单晶传感器
将二水合醋酸锌(66mg,0.3mmol)、配体5-甲基间苯二甲酸(27mg,0.15mmol)和氢氧化钠(0.25M,0.15mL)溶解在乙腈(24mL)和水(1mL)中,放入到聚四氟乙烯的钢制反应釜中,并封盖,在溶剂热条件下,170℃恒温两天,以5℃/h的速率缓慢降至室温,得到无色块状晶体,该无色块状晶体的分子式为:{[Zn2Na(L)(HL)2(H2O)2][OAc]·2H2O},即为Zn(II)/Na(I)单晶传感器。
在显微镜下选取合适大小的单晶在室温下进行X–射线衍射实验。在BrukerSmartApex-II CCD衍射仪上,用经石墨单色器单色化的Mo–Kα射线
Figure BDA0001529404980000033
Figure BDA0001529404980000032
,以φ–ω方式收集衍射数据。用Bruker SAINT程序进行数据还原。部分结构的衍射数据用SADABS程序进行吸收校正。晶体结构由直接法结合差值Fourier合成解出。全部非氢原子坐标及各向异性参数进行全矩阵最小二乘法修正,C–H原子位置按理论模式计算确定。配合物中金属银的配位环境图见图1;配合物的晶体结构图见图2;详细的晶体测定数据见表1。
表1配合物的主要晶体学数据
Figure BDA0001529404980000031
Figure BDA0001529404980000041
实施例2:本发明Zn(II)/Na(I)单晶传感器在检测水中Cu2+浓度的具体应用
首先,把本发明合成的Zn(II)/Na(I)单晶传感器在玛瑙研钵中研磨1小时,然后把研磨后的10mg样品加入10mL蒸馏水中,得到1mg mL-1悬浊的Zn(II)/Na(I)传感器。其次,向1mg mL-1悬浊的Zn(II)/Na(I)传感器加入不同浓度的Cu2+,平衡1分钟后,用日立荧光光谱仪检测荧光变化,见图4。并且展现出很好的线性范围,见图5。这说明此传感器能够很好的检测水中0.5-1200μM Cu2+浓度。

Claims (5)

1.Zn(II)/Na(I)配合物单晶,其特征在于,其化学式为:{[Zn2Na(L)(HL)2(H2O)2][OAc]·2H2O},其中H2L代表5-甲基间苯二甲酸;属于正交晶系,空间群为Pnma,
Figure FDA0002312061290000011
α=90°,β=90°,γ=90°,
Figure FDA0002312061290000012
2.制备权利要求1所述的Zn(II)/Na(I)配合物单晶的方法,其特征在于,通过如下步骤实现:将二水合醋酸锌、5-甲基间苯二甲酸与氢氧化钠水溶液加入到乙腈和水中,封入聚四氟乙烯的钢制反应釜中,在溶剂热法条件下,160-170℃恒温两天,以4-5℃/h的速率缓慢降温,降至室温后,得到目标产物。
3.权利要求2所述的Zn(II)/Na(I)配合物单晶的制备方法,其特征在于,二水合醋酸锌:5-甲基间苯二甲酸:氢氧化钠的摩尔比为1.5-2:1:1;乙腈和水的体积比为20-25:1。
4.如权利要求1所述的Zn(II)/Na(I)配合物单晶的应用,其特征在于,作为传感器应用于检测水中Cu2+浓度。
5.如权利要求4所述的Zn(II)/Na(I)配合物单晶的应用,其特征在于,具体方法如下:将Zn(II)/Na(I)单晶传感器在玛瑙研钵中研磨,然后把研磨后的样品加入蒸馏水中,得到悬浊的Zn(II)/Na(I)传感器;然后,向悬浊的Zn(II)/Na(I)传感器加入待测液,混合均匀后,用荧光光谱仪检测荧光强度,根据荧光强度与Cu2+浓度的线性曲线,定量检测水中Cu2+浓度。
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CN105541879A (zh) * 2016-01-15 2016-05-04 辽宁大学 一种三维的多孔配位聚合物及其制备方法和应用

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A cubic luminescent graphene oxide functionalized Zn-based metal-organic framework composite for fast and highly selective detection of Cu2+ ions in aqueous solution;Liying Hao et al.;《Analyst》;20131118;764-770页 *
New Zn(II)/M(I) (M = Na, K and Rb) Metal-organic Frameworks Based on 5-Methylisophthalic Acid Ligand: Syntheses, Structures and Fluorescent Property;XUE Li-Ping et al.;《结构化学》;20140815;1191-1198页 *

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