کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1187443 963463 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ab initio investigation of the topology and properties of three-dimensional clusters of water (H2O)n
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Ab initio investigation of the topology and properties of three-dimensional clusters of water (H2O)n
چکیده انگلیسی

Quantum mechanical studies were carried out in order to understand and describe the nature and strength of the hydrogen bond topology in three dimensional water cluster systems (H2O)n, in the size range 6–20 molecules. Optimal structures and vibrational frequencies of cage like water clusters are computed at the Hartree–Fock (HF) and the electronic density functional theory (DFT) level of theory with a detailed data analysis. Theoretical results are compared to experimental data when available. The general tendency is a decrease of the global minimum energy as the cluster size increases. The nearest neighbour separation between oxygen atoms decreases exponentially when the cluster size increases. The present work suggests that DFT results are in a good agreement with the corresponding HF data, however slight differences remain with regard to values of the nearest neighbour separation between oxygen atoms. The Morokuma’s decomposition of the total interaction energy performed on two and three-dimensional clusters lead to a better understanding of the cluster formation with a strong polarization energy component.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Chemistry - Volume 106, Issue 4, 15 February 2008, Pages 1476–1484
نویسندگان
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