Electron-deficient bonding in rhomboid rings.

@article{Balakrishnarajan2004ElectrondeficientBI,
  title={Electron-deficient bonding in rhomboid rings.},
  author={Musiri M. Balakrishnarajan and Roald Hoffmann},
  journal={Journal of the American Chemical Society},
  year={2004},
  volume={126 40},
  pages={
          13119-31
        }
}
The bonding environment of boron is usually thought about in terms of localized 2c-2e/3c-2e bonding (as in diborane) or completely delocalized polyhedral bonding (as in B(12)H(12)(2)(-)). Recently, a number of boron compounds having a rhomboidal B(4) framework have been synthesized; these show an amazing variation in their skeletal electron count, one that cannot be interpreted in familiar ways. In this report, we systematically explore the origin of the range of electron counts in these… 
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Electron-Deficient Triborane and Tetraborane Ring Compounds: Synthesis, Structure, and Bonding.
TLDR
This Review intends to provide the basis for the exploration of the chemistry of these rings and, in particular, their integration into larger molecular architectures.
A Radical Tricationic Rhomboid Tetraborane(4) with Four-Center, Five-Electron Bonding.
TLDR
The red-colored tetraborane(4) [B4 (hpp)4 ](3+.) with a rhomboid B4 skeleton stabilized by four N donors, was synthesized by the reaction of the strong hydride abstraction reagent with the electron-rich diborane( 4) [HB(hpp)]2 (1).
Face-capping μ3-BO in B6(BO)7-: boron oxide analogue of B6H7- with rhombic 4c-2e bonds.
TLDR
The adaptive natural density partitioning (AdNDP) analysis provides a direct and visual picture of the B- boron oxide analogue of closo-B6H7(-) with a face-capping μ(3)-H for the first time.
Four Boron Atoms, Four Positive Charges, and Four Skeletal Electrons: A Fluorescent σ-Aromatic Tetraborane(4).
TLDR
Analysis shows that the new tetraborane(4) is stabilized in the solid state by the lattice energy and exhibits an extremely high electron affinity and is only stable in solution after one-electron reduction to the radical cation.
Unexpected Stability of Al4H6: A Borane Analog?
TLDR
A combined anion photoelectron and density functional theory computational study of the Al4H –6 anion and its corresponding neutral, Al4h6, showed that Al4 H6 can be understood in terms of the Wade-Mingos rules for electron counting, suggesting that it may be a borane analog.
B-B Coupling and B-B Catenation: Computational Study of the Structure and Reactions of Metal-Bis(borylene) Complexes.
TLDR
A detailed molecular orbital analysis of the metal-bis(borylene) complex (Dur=2,3,5,6-tetramethylphenyl) serves as a focal point of recent developments in this area of chemistry, such as B-B coupling and B- B catenation reactions.
Structure and bonding of zinc antimonides: complex frameworks and narrow band gaps.
TLDR
A simple bonding picture is developed for these frameworks where multicentre bonding is confined to rhomboid rings Zn2Sb2, which enable to establish a clear relationship between disordered beta-Zn4Sb3 and ordered low-temperature alpha- Zn4 Sb3.
B4H4 and B4(CH3)4 as Unique Electron Donors in Hydrogen-Bonded and Halogen-Bonded Complexes.
TLDR
Ab initio MP2/aug'-cc-pVTZ calculations have been carried out on B4H4 and B4(CH3)4 to investigate the base properties of these molecules with Td symmetry to find binding energies significantly greater than the binding energies of the corresponding complexes with B 4H4.
Electronic and atomic structure of the Al(n)H(n+2) clusters.
The electronic and atomic structure of the family of hydrogenated Al clusters Al(n)H(n+2) with n=4-11 has been studied using the density functional theory with the generalized gradient approximation…
A new 4c-2e bond in B6H7-.
For N(C(4)H(9))(4)B(6)H(7) a proton is shown to be localised above one of the faces of the distorted octahedron, and rhomboid rings are formed as shown by topological analysis of charge densities.
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