Two Mg–Mg-bonded compounds were synthesized by using phenanthrene-diimine and o-phenylenediamine ligands; their UV-Vis and fluorescence spectra and reactivity were studied.
Metal–metal-bonded
compounds containing low-valent metal
centers have attracted much attention because of their novel structure
and reactivity, while the proper choice of ligands with suitable electronic
and steric properties is the key to the synthesis of such species.
Herein, we demonstrate that the ortho-phenylene-diamine
(dipp-H2pda, H2
L) ligand upon deprotonation
to the dianion (dipp-pda2–) can effectively stabilize
a series of E–E bonds, including group 12–15 elements
Zn, Ga, Ge, and P. In particular, a Ge(I) compound in the digermylene
form, [LGeI–GeI
L]2–, has been isolated, which features the longest
GeI–GeI bond (2.8774(4) Å) reported
so far. The molecular and electronic structures of the compounds and
their E–E bonding nature have been studied by X-ray diffraction,
NMR or EPR and UV–vis spectroscopy, and computations.
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