Isodiagonality in the periodic table

Abstract

Diagonal relationships in the periodic table were recognized by both Mendeléev and Newlands. More appropriately called isodiagonal relationships, the same three examples of lithium with magnesium, beryllium with aluminum, and boron with silicon, are commonly cited. Here, these three pairs of elements are discussed in detail, together with evidence of isodiagonal linkages elsewhere in the periodic table. General criteria for defining isodiagonality are proposed.

Experimental Study on Hydrothermal Carbonization of Lignocellulosic Biomass with Magnesium Chloride for Solid Fuel Production

“…This study uses magnesium chloride (MgCl 2 ) as additive, since lithium and magnesium are closely related due to the isodiagonality that exists in the periodic table, which, by definition, is the similarity in chemical properties between an element and that to the lower right of it in the periodic table [22]. Proof of their behavior is that lithium and magnesium have similar characteristics (such as atomic and ionic radius), form the same types of compounds (nitrites, salts, oxides), and react with the same acids and bases [23].…”

Li7(BH)5+: a new thermodynamically favored star-shaped molecule

“…[8][9][10][11][12][13][14][15] The enhanced thermodynamic stability of aromatic hydrocarbons inspired chemists to extend the aromaticity concept to inorganic chemistry with the aim of helping to rationalize, predict and synthesize stable compounds. [16][17][18][19] A simple protocol used by scientists to theoretically design inorganic aromatic compounds is the following: to build valence isoelectronic compounds to match their aromatic organic counterparts.…”

Chemoselective Amide‐Forming Ligation Between Acylsilanes and Hydroxylamines Under Aqueous Conditions

“…We hypothesized that this new acylsilane‐hydroxylamine (ASHA) ligation could be driven by the formation of a strong Si−O bond via a Brook‐type rearrangement [18] (Figure 2, pathway A). Moreover, boron and silicon show diagonal relationships [19] and as such, acylsilanes could behave in a similar fashion to acylboronate derivatives, including KATs and MIDA acylboronates, upon treatment with hydroxylamines under suitable conditions [20]…”