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Bending Ternary Dihalides
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2018-10-31 00:00:00 , DOI: 10.1021/acs.jpca.8b09068
Supreeth Prasad 1 , Bernard K. Wittmaack 1 , Kelling J. Donald 1
Affiliation  

The bonding preferences in the mixed dihalides (MXY) of groups 2 and 12 metals, including the extent of any anomalous bending, are assessed and established. The deviation from linearity in group 2 metal binary dihalides is well-known, runs contrary to simple bonding models, and is believed to be decisive for structural preferences in the extended solids. Yet the bonding in the ternary, MXY, molecules has not been investigated systematically until now. The structure and bonding in these ternary systems (and, for completeness, the binary cases as well) are determined herein at high levels of theory. A softness criterion formulated by Szentpály and Schwerdtfeger, and tested initially on binary dihalides with predictions for mixed systems, is confirmed to apply broadly for binary and ternary species of the group 2 and 12 metals. For each M, a function of the form E(Θ) = AekΘ is shown to predict the barriers to linearization for all of the bent molecules. The extended solids of some of the ternary dihalides are of interest for their optical properties. The bonding in the molecular (MXY) units may offer we think some new perspectives from which to rationalize the bonding preferences in those crystal structures.

中文翻译:

弯曲三元二卤化物

评估并确定了第2组和第12组金属的混合二卤化物(MXY)中的键合偏好,包括任何异常弯曲的程度。第2组金属二元二卤化物的线性偏差是众所周知的,与简单的键合模型相反,并且被认为对扩展固体中的结构偏好具有决定性作用。到目前为止,三元分子MXY的键合尚未得到系统的研究。这些三元系统中的结构和键合(以及完整性,也包括二元情况)在本文中以较高的理论水平确定。由Szentpály和Schwerdtfeger制定的柔软度标准,最初在二元二卤化物上进行了测试,并预测了混合系统,已确认该柔软性标准广泛适用于2和12组金属的二元和三元物种。对于每个M,È(Θ)=ë - ķ Θ被示出为预测的障碍线性化对于所有的弯曲的分子。一些三元二卤化物的扩展固体因其光学性质而受到关注。分子(MXY)单元中的键合可能为我们提供一些新的观点,从这些观点可以合理化那些晶体结构中的键合偏好。
更新日期:2018-10-31
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