一些重金属酸盐在水溶液中的离子结合和化
Johannes Hunger1, Richard Buchner2, Glenn Hefter3
1Department for Molecular Spectroscopy, Max Planck Institute for Polymer Research, D-55128 Mainz, Germany.
这项研究使用介电放松光谱来研究重金属酸盐溶液. 结果显示了阴离子水化数和离子对形成,显示了Cd2+和Pb2+离子的强度溶解.
科学领域:
- 物理化学 物理化学
- 解决方案化学 解决方案化学
- 频谱学是一种光谱学.
背景情况:
- 了解离子-水相互作用对于各种化学和生物过程至关重要.
- 重金属离子显著影响水的结构和动态.
研究的目的:
- 在水溶液中研究重金属酸盐 (AgNO3, TlNO3, Cd(NO3) 2, Pb(NO3) 2) 的溶解动力学和离子配对.
- 确定接触离子对的有效水合数和关联常数.
主要方法:
- 宽带介电放松光谱 (DRS) 用于研究水溶液.
- 测量是在25°C进行的,频率范围为0.27至115 GHz.
- 通过适应Debye和Cole-Cole放松模型来分析光谱.
主要成果:
- 斯佩克特表示有三个主要的放松过程:与溶液相关的接触离子对 (CIP),合作性水放松和H键翻转.
- 对于Cd(NO3) 2的额外模式建议溶剂共享离子对.
- 在无限稀释时,有效的水合数为Ag+和Tl+的约5,Pb2+的10和Cd2+的20左右.
- 由于离子-离子相互作用,随着溶液度的增加,水合数减少.
结论:
- 重金属酸具有强烈的溶解,其中Cd2+和Pb2+形成了显著的水化.
- 离子-离子相互作用降低了高度的溶解.
- 接触离子对的弱复合遵循Tl+ < Ag+ < Pb2+ < Cd2+的顺序,与电荷/半径比和水化能量保持一致.
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