Theoretical calculations are carried out to investigate the Ga−Ga bond in the title compound, whose description as the first example of a triple bond between group 13 elements has sparked considerable interest. The short Ga−Ga bond length is found to be the result of several factors, including Na−terphenyl and terphenyl−terphenyl ionic interactions, direct Ga−Na−Ga bridge bonding, and adjustments in the C−Ga−Ga angles due to the steric requirements of the i -Pr groups on the bulky m -terphenyl ligands.
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Takagi et al. (2001) studied this question.
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