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1H NMR spectrum of 1 are assigned and there are no signals in the typical region of Ge-H groups (about 3.92 and 8.0 ppm) also the IR and Raman spectra does not provide any indications for the presence of terminal Ge-H moieties
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One referee suggested that the reason for the Ge-Ge p bonding could be the slightly larger electronegativity of Ge compared with Ga. We checked this by calculating the silicon and tin homologues of 1M. The electronegativities of Si (1.7) and Sn (1.7) are smaller than that of Ga (1.8) but the electronic structure of the group-14 homologues showed also Si-Si and Sn-Sn p bonding, respectively
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One referee suggested that the reason for the Ge-Ge p bonding could be the slightly larger electronegativity of Ge compared with Ga. We checked this by calculating the silicon and tin homologues of 1M. The electronegativities of Si (1.7) and Sn (1.7) are smaller than that of Ga (1.8) but the electronic structure of the group-14 homologues showed also Si-Si and Sn-Sn p bonding, respectively.
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2+[23b] which can not be considered as proof for π bonding without s bonding
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[24b] where two S-S π orbitals of three-membered cyclic fragments yield S-S σ bonds.
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