CN108373477B - 一种双核镉有机骨架配合物及其制备方法和应用 - Google Patents
一种双核镉有机骨架配合物及其制备方法和应用 Download PDFInfo
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Abstract
本发明公开了一种双核镉有机骨架配合物及其制备方法和应用。所述配合物化学式为[Cd2(μ3‑cpima)(μ3‑Hcpimda)(H2O)]n，其中H3cpimda为1‑(4‑羧基苯甲基)‑2‑丙基‑1H‑咪唑‑4,5‑二甲酸,H2cpima为配体H3cpimda在反应中分解生成的另外一个配体，即1‑(4‑羧基苯甲基)‑2‑丙基‑1H‑咪唑‑4‑甲酸。所述制备方法，是将摩尔比为1:2的1‑(4‑羧基苯甲基)‑2‑丙基‑1H‑咪唑‑4,5‑二甲酸与氯化镉加入体积比为10:2的H2O和乙腈中，在密闭反应釜中于160℃反应72小时，即得到无色块状晶体，产率为67％。本发明的配合物具有二维骨架结构，中心金属镉(II)离子分别采用六配位和七配位模式。当用340nm波长的光激发该固态配合物时，配合物在400nm处出现发射峰，CIE色坐标为(0.24,0.21)，位于蓝光区，该配合物可作为光学材料应用。
Description
技术领域
本发明涉及过渡金属配合物，具体涉及一种双核镉有机骨架配合物及其制备方法，以及该配合物作为发光材料的应用。
背景技术
金属有机框架结构(MOFs)是一类由中心金属离子和有机配体自组装而成的配位聚合物，在气体吸附，光学，磁学等方面具有潜在的应用价值，其中含有d10电子的过渡金属有机配合物作为光致发光材料同传统无机发光材料相比，一方面因其特殊的分子刚性结构，使得分子辐射跃迁概率大大增强，即具有高荧光量子效率；另一方面又兼具无机物的高稳定性，即为其作为功能材料应用提供了保证，是一类良好的发光材料。
1-(4-羧基苯甲基)-2-丙基-1H-咪唑-4,5-二甲酸由于含有三个羧基，可以通过全部脱质子或部分脱质子而与金属构筑多样的MOFs，特别是当其与具有d10电子结构的金属离子配位形成配合物后，在发光、光记录与存储等领域具有潜在的应用价值。到目前为止，过渡金属与1-(4-羧基苯甲基)-2-丙基-1H-咪唑-4,5二甲酸构筑的配合物还未见报导。
发明内容
本发明的目的在于提供一种双核镉有机骨架配合物及其制备方法，以及该配合物作为发光材料的应用。
本发明提供的一种双核镉有机骨架配合物，其化学式为：[Cd2(cpima)(Hcpimda)(H2O)]n，其中H3cpimda为1-(4-羧基苯甲基)-2-丙基-1H-咪唑-4,5-二甲酸,H2cpima为1-(4-羧基苯甲基)-2-丙基-1H-咪唑-4-甲酸；所述配合物结构式为：
该配合物的晶体属于单斜晶系，空间群为P21/n，晶胞参数：
α＝γ＝90°，β＝109.9860(10)°。该配合物中镉离子分别为六配位和七配位模式，其中Cd1与四个氧原子和两个氮原子配位形成六配位的八面体结构，其中两个氧(O2,O7)和两个氮(N1,N3)分别来自两个不同配体Hcpimda2-和cpima2-咪唑上的N和羧基O原子，另外一个氧(O4A)来自由对称性产生的相邻配体中苯甲酸上的O原子。Cd2与七个氧原子(O5,O6,O7A,O8A,O9,O9A和O10A)配位，其中配体Hcpimda2-和cpima2-上苯甲酸的羧基作为双齿配位原子参与配位，即五个氧原子(O5,O6,O7A,O8A,O9A和O10A)分别来自一个Hcpimda2-和两个cpima2-配体上的双齿配位羧基，另外一个来自不同配体的氧原子O9作为单齿配位原子与Cd2配位，形成五角双锥结构。该配合物为二维结构。Cd-O键的键长范围为
X射线粉末衍射证实晶体样品为均相。在室温下，用340nm波长的光激发该配合物的固体粉末，结果显示，配合物在400nm处出现发射峰，相比配体，其荧光强度明显增强且发生蓝移。因此，本发明双核镉机骨架配合物可以作为发光材料。
本发明提供一种双核镉机骨架配合物的制备方法，包括如下步骤：
(1)将摩尔比为1:2的1-(4-羧基苯甲基)-2-丙基-1H-咪唑-4，5-二甲酸与CdCl2·2.5H2O加入到体积比为10:2的H2O和CH3CN混合溶剂中，置于聚四氟乙烯管中。
(2)将步骤(1)中的聚四氟乙烯管置于不锈钢反应釜中密封，温度控制在160℃，反应72小时，自然降温至室温，得到无色块状晶体，蒸馏水洗涤三次，真空干燥即可。
与现有技术相比，本发明的有益效果：
本发明的过渡金属镉有机骨架配合物通过混合溶剂热法合成得到，制备方法简单，成本低，产量高，晶相均一。
本发明提供的镉有机骨架配合物基于一种配体1-(4-羧基苯甲基)-2-丙基-1H-咪唑-4，5-二甲酸构筑，室温条件下该配合物的固体荧光发射光谱显示，当激发波长为340nm时，配合物显示出较强的蓝光特征，色坐标为(0.24,0.21)，该配合物可以用作光学材料。
附图说明
图1双核镉有机骨架配合物的晶体结构图。
图2双核镉有机骨架配合物在298K的X射线粉末衍射图(实验及模拟图)。
图3双核镉有机骨架配合物的热分析图。
图4双核镉有机骨架配合物及1-(4-羧基苯甲基)-2-丙基-1H-咪唑-4,5-二甲酸在298K的荧光光谱图。
具体实施方式
实施例1.[Cd2(cpima)(Hcpimda)(H2O)]n的制备方法
1)称取0.05mmol H3cpimda与0.1mmol CdCl2·2.5H2O放入20ml的聚四氟乙烯管中，并加入10ml H2O和2ml CH3CN，然后将聚四氟乙烯管密封于不锈钢反应釜中，温度控制在160℃加热72小时，自然降至室温，得到无色块状晶体，用蒸馏水洗涤三次，真空干燥，所得镉配合物的产率为67％。元素分析：理论值(％)：C 42.54,H 3.45,N 6.48；实验值(％):C42.49,H 3.43,N 6.40。
实施例2.[Cd2(cpima)(Hcpimda)(H2O)]n的晶体结构
在显微镜下选取合适大小的单晶，采用X射线衍射，以Bruker Smart Apex II探测器通过石墨单色器单色化的Mo-Kα射线，扫描方式ω，室温收集衍射数据。所有衍射数据经SAINT还原后，使用SADABS程序进行半经验吸收校正。晶体结构由SHELXL-97直接法解得。详细的晶体测定数据见表1；晶体结构如图1所示，Cd(II)采用六配位和七配位模式。
表1 配合物的晶体学数据
实施例3.[Cd2(cpima)(Hcpimda)(H2O)]n的物相分析
X射线粉末衍射如图2所示，实验衍射图谱与依据晶体结构模拟的粉末衍射图谱一致，表明晶体样品均一。
实施例4.[Cd2(cpima)(Hcpimda)(H2O)]n的热稳定性测试结果
热稳定性如图3所示，配合物在103℃左右开始失重，在103～138℃之间首先失去一分子的游离水和一分子的配位水分子(实验值4.19％，理论值4.11％)，在238℃左右配合物骨架开始逐渐坍塌。说明该配合物在室温下可以稳定存在。
实施例5.[Cd2(cpima)(Hcpimda)(H2O)]n的发光性质
在室温下测定了配体和配合物的固体荧光发射光谱(图4)。从图中可看出，在340nm波长激发下，配合物在400nm处有较强的蓝光发射峰，可以归因于电子在配体间的跃迁。与配体相比，配合物的荧光显著增强且发生了蓝移，原因是配体与金属离子配位后有效地增强了配体的刚性，降低了非辐射能量损失。
Claims (3)
1.一种双核镉有机骨架配合物，其特征在于，化学式为：[Cd2(cpima)(Hcpimda)(H2O)]n，其中H3cpimda为1-(4-羧基苯甲基)-2-丙基-1H-咪唑-4,5-二甲酸,H2cpima为1-(4-羧基苯甲基)-2-丙基-1H-咪唑-4-甲酸；结构式为：
该配合物的晶体属于单斜晶系，空间群为P21/n，晶胞参数：
α＝γ＝90°，β＝109.9860(10)°。
2.如权利要求1所述的一种双核镉有机骨架配合物的制备方法，其特征在于，包括如下步骤：
(1)将摩尔比为1:2的1-(4-羧基苯甲基)-2-丙基-1H-咪唑-4,5-二甲酸与氯化镉加入到含有体积比为10:2的H2O和DMF混合溶剂的聚四氟乙烯管中；
(2)将此聚四氟乙烯管置于不锈钢反应釜中密封，升温至160℃反应72小时，自然降至室温，得到无色块状晶体，用蒸馏水洗涤三次，真空干燥即可。
3.如权利要求1所述的一种双核镉有机骨架配合物作为发光材料的应用。
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