Analysis of the bonding in tetrahedrane and phosphorus-substituted tetrahedranes

Del Angel Cruz, Daniel; Galvez Vallejo, Jorge L.; Gordon, Mark S.

doi:10.1039/d3cp03619g

Title: Analysis of the bonding in tetrahedrane and phosphorus-substituted tetrahedranes

Journal Article · Tue Sep 26 00:00:00 EDT 2023 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/d3cp03619g· OSTI ID:2008101

Del Angel Cruz, Daniel ^[1]; Galvez Vallejo, Jorge L. ^[2];

^[1]

Iowa State University, Ames, IA (United States)
Iowa State University, Ames, IA (United States); Australian National University, Canberra, ACT (Australia)

The bonding structures of tetrahedrane, phosphatetrahedrane, diphosphatetrahedrane and triphosphatetrahedrane are studied by employing an intrinsic quasi-atomic orbital analysis. Ethane, cyclopropane and tetrahedral P₄ are employed as reference systems. The orbital analysis is paired with the computation of strain energies via isodesmic reactions. The results show that the increase in geometric strain upon transition from ethane to cyclopropane to tetrahedrane weakens the CC bonds, despite leading to shorter C–C interatomic distances. With the increase in strain, the orbitals centered on C and involved in the bonding of the cage structure are observed to have elevated p-character, and the orbital structure of C deviates from sp³ hybridization. The systematic substitution of CH groups by P atoms in the cage structure of tetrahedrane leads to stronger CC bonds, larger angles in the cage structures of the resulting phosphatetrahedranes, lower p-character in the orbitals involved in the bonding of the cages, and lower strain energies. It is found that P is more amenable to strained molecular arrangements than is C, and that the propensity of a given atom to hybridize s and p functions, or the lack thereof, has implications in the stability of molecules with strained geometries. The combination of the calculations presented here with the existing literature provides insight into the apparent propensity of tetrahedrane and P₄ to ‘break’ their tetrahedral structures. Trends in the bonding interactions, such as bond strengths, s- and p-orbital characters and charge transfer are identified and related to the strain energy observed in each of the analyzed systems.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2008101

Report Number(s):: IS-J-11,161

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Vol. 25, Issue 40; ISSN 1463-9076

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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