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Poly(siloxane)s, Poly(silazane)s and Poly(carbosiloxane)s
Published in Narendra Pal Singh Chauhan, Functionalized Polymers, 2021
Claire E. Martin, Giovanni Fardella, Ricardo Perez, Joseph W. Krumpfer
Further, based on the electronegativities of these elements, silicon actually has more in common with boron (B) than any other element (Pauling 1960). This is taught to chemists as the “diagonal relationship” and arises from the similar electron densities, or the number of electrons per size of the atom, of these two elements. For this reason, we observe that silicon and boron behave similarly in a number of reactions (Thomas 2006) and form nearly covalent bonds. On the other hand, the electronegativity difference between silicon and oxygen is drastic. In fact, while the siloxane (Si-O) bond is often considered covalent, it actually has a stronger ionic nature (Weinhold and West 2011), having been calculated to be 51% ionic (Pauling 1980). Likewise, even the silicon carbide (Si-C) bond has a slightly ionic nature, being roughly 12% ionic.
Studying the impact of diagonal-doping on thermal stability of main-group metal clusters via Born Oppenheimer molecular dynamics
Published in Molecular Physics, 2022
Krati Joshi, Raghunath O. Ramabhadran
We further reckoned that in order to systematically study the effect of doping on thermal stability of clusters, the heuristic principle of ‘diagonal relationship’ used widely in main-group chemistry is particularly helpful [65–68]. ‘Diagonal relationship’ refers to the similar chemistry/physical property noted between diagonally adjacent main group elements such as Li-Mg, Be-Al and B-Si (diagonal-pairs). In cluster science, this concept is termed as ‘diagonal-rule’, extends beyond main group clusters and has been only recently explored to a limited extent in the designing of new materials with enhanced electrical and optical properties [69–72]. For example, Zr is replaced with Ta resulting in enhanced thermo-electronic performance of ZrTaNiSn Half-Heusler alloy [73]. Similarly diagonal-relationship between Al and Be has been applied in the formation of highly efficient phosphor materials and various organomatellic compounds [67,68]. Beyond these studies, we were unable to find any other study exploring the idea of diagonal rule/relationship in cluster science.