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pH-controlled crystal growth of copper/gemini surfactant complexes with bipyridine groups
CrystEngComm ( IF 2.6 ) Pub Date : 2017-08-24 00:00:00 , DOI: 10.1039/c7ce01251a Junyao Yao 1, 2, 3, 4, 5 , Qibin Chen 1, 2, 3, 4, 5 , Yujie Sheng 1, 2, 3, 4, 5 , Aiting Kai 1, 2, 3, 4, 5 , Honglai Liu 1, 2, 3, 4, 5
CrystEngComm ( IF 2.6 ) Pub Date : 2017-08-24 00:00:00 , DOI: 10.1039/c7ce01251a Junyao Yao 1, 2, 3, 4, 5 , Qibin Chen 1, 2, 3, 4, 5 , Yujie Sheng 1, 2, 3, 4, 5 , Aiting Kai 1, 2, 3, 4, 5 , Honglai Liu 1, 2, 3, 4, 5
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The pH-controlled crystal growth of two complexes with different coordination modes, derived from gemini surfactant molecules with a bipyridyl spacer (12Bpy) and metal copper ions (Cu2+) is presented in this work. Such crystalline forms obtained in appropriate pH ranges exhibit dissimilar morphologies, colors and crystalline structures. Under weak acidic conditions with a slightly higher pH (>4.3), blue grain crystals, made from dihydroxo-bridged binuclear complexes with a square pyramidal coordination mode, are formed, whereas under slightly stronger acidic conditions (pH <3.8 in this work), green crystals with mononuclear complexes with a distorted trigonal bipyramidal geometry are readily fabricated, and meanwhile the blue crystals are completely inhibited. In particular, these two crystals concomitantly existed in an intermediate pH range of 3.8–4.3. We suggest a fivefold coordinated Cu(II)/12Bpy complex with a 1
:1 metal–ligand ratio and three hydrated water ligands and a pH-controlled crystal growth mechanism on the basis of UV-vis spectra and density functional theory (DFT) calculations. Our findings indicate that pH adjustment is a straightforward and efficient way to control the crystal growth, having potential application in the preparation of smart and multifunctional materials.
中文翻译：
具有联吡啶基团的铜/双子表面活性剂复合物的pH控制晶体生长
由具有双吡啶基间隔基（12Bpy）的双子表面活性剂分子和金属铜离子（Cu 2+）在此工作中介绍。在合适的pH范围内获得的这种晶体形式表现出不同的形态，颜色和晶体结构。在pH稍高（> 4.3）的弱酸性条件下，会形成由具有方形金字塔配位模式的二氢桥联双核络合物制成的蓝色晶粒晶体，而在酸性条件稍强的环境下（本研究中的pH <3.8），容易制造出具有单核配合物，扭曲的三角双锥体几何形状的绿色晶体，同时完全抑制了蓝色晶体。特别是，这两个晶体同时存在于3.8-4.3的中等pH范围内。我们建议配以1的五重配位的Cu（II）/ 12Bpy配合物：根据紫外可见光谱和密度泛函理论（DFT）计算，获得了1种金属配体比和3种水合配体，以及一个pH受控的晶体生长机理。我们的发现表明，pH调节是控制晶体生长的一种直接有效的方法，在制备智能和多功能材料方面具有潜在的应用前景。
更新日期：2017-09-15
:1 metal–ligand ratio and three hydrated water ligands and a pH-controlled crystal growth mechanism on the basis of UV-vis spectra and density functional theory (DFT) calculations. Our findings indicate that pH adjustment is a straightforward and efficient way to control the crystal growth, having potential application in the preparation of smart and multifunctional materials.
中文翻译：
具有联吡啶基团的铜/双子表面活性剂复合物的pH控制晶体生长
由具有双吡啶基间隔基（12Bpy）的双子表面活性剂分子和金属铜离子（Cu 2+）在此工作中介绍。在合适的pH范围内获得的这种晶体形式表现出不同的形态，颜色和晶体结构。在pH稍高（> 4.3）的弱酸性条件下，会形成由具有方形金字塔配位模式的二氢桥联双核络合物制成的蓝色晶粒晶体，而在酸性条件稍强的环境下（本研究中的pH <3.8），容易制造出具有单核配合物，扭曲的三角双锥体几何形状的绿色晶体，同时完全抑制了蓝色晶体。特别是，这两个晶体同时存在于3.8-4.3的中等pH范围内。我们建议配以1的五重配位的Cu（II）/ 12Bpy配合物
：根据紫外可见光谱和密度泛函理论（DFT）计算，获得了1种金属配体比和3种水合配体，以及一个pH受控的晶体生长机理。我们的发现表明，pH调节是控制晶体生长的一种直接有效的方法，在制备智能和多功能材料方面具有潜在的应用前景。
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