QuantumATK Forum
QuantumATK => General Questions and Answers => Topic started by: Akash Ramasamy on May 30, 2023, 06:31
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The Covalent radii in the literature are Si(116 pm) and O(63 pm). But in my case, the covalent bond is formed around (199 pm) between Si and O atoms. Generally, the literature's are mentioning the bond distance must be less than or equal to the sum of covalent radii. Whether the bond I get is considered to be a covalent or van der Waals interaction.
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In general, when the bond distance between two atoms is larger than the sum of their covalent radii, it suggests that the interaction is more likely to be a non-covalent interaction, such as a van der Waals interaction, rather than a typical covalent bond.
In your case, if the bond distance between the Si and O atoms is significantly larger (199 pm) than the sum of their covalent radii (116 pm + 63 pm = 179 pm), it suggests that the interaction is more likely to be a van der Waals interaction rather than a typical covalent bond. However, it is important to note that the classification of an interaction as covalent or non-covalent is not always straightforward and can depend on various factors, including the nature of the atoms involved and the specific molecular environment.
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Thanks for your suggestion.