π Aromaticity and Three‐Dimensional Aromaticity: Two sides of the Same Coin?

Abstract

A bridge between classical organic polycyclic aromatic hydrocarbons (PAH) and closo borohydride clusters is established by showing that they share a common origin regulated by the number of valence electrons in an electronic confined space. Application of the proposed electronic confined space analogy (ECSA) method to archetypal PAHs leads to the conclusion that the 4n+2 Wade-Mingos rule for three-dimensional closo boranes is equivalent to the (4n+2)π Hückel rule for two-dimensional PAHs. More importantly, use of ECSA allows design of new interesting fused closo boranes which can be a source of inspiration for synthetic chemists.

Reactivity of boron cluster anions [B10H10]2−, [B10Cl10]2− and [B12H12]2− in cobalt(II)/cobalt(III) complexation with 1,10-phenanthroline

“…The presence of chloride-anions and solvent molecules can effect complexation reactions: they are able to replace other ligands in metal coordination sphere, and the resulting metal/ligands ratio in the obtained products does not correspond to the initial molar ratio of reagents. Complexes [Co(phen) 2 Cl(H 2 O)]Cl [13] and abovementioned [Co(m-NBh) 4 ] (n = 10, 12) was proved by X-ray diffraction; first cobalt(II) compounds with perchlorinated closodecaborate anion and cobalt(III) complex with the closo-dodecaborate anion were synthesized and structurally characterized.…”

“…Besides, the boron cluster anions form numerous polymeric or mononuclear complexes with such metals as Pb, Cu, Ag, Au, Zn, Cd, Hg, etc [3]. Although these are compounds with electron-deficient bonds [4], they can form in addition to coordination bonds a wide set of specific B-H. . .H(X) (X = N, O, C) interactions [5].…”

Homocatenation of Aluminum: Alkane‐like Structures of Li2Al2H6 and Li3Al3H8

“…Very recently, it was shown by Poater et al that classical organic polycyclic aromatic hydrocarbons (PAH) and closo-borohydride clusters share a common origin regulated by the number of valence electrons in an electronic confined space. [13] Different cases of boron homocatenated compounds stabilized by lithium and hydrogen atoms were theoretically tested. [14] A number of theoretical studies on different compounds mimicking common organic species is reported elsewhere.…”

Testing the effectiveness of the isoelectronic substitution principle through the transformation of aromatic osmathiophene derivatives into their inorganic analogues

“…[10][11][12] Furthermore, the link between hydrocarbons and borohydrides has also been analyzed, finding that these compounds share a common root regulated by the number of valence electrons in a confined space. [13][14] Interestingly, these authors demonstrated the existence of a relation between planar aromatic annulenes and tridimensional aromatic closo boron hydride clusters. 15 These results seem to indicate that the IS principle applies effectively when designing boron analogues of aromatic organic compounds.…”