Homo metal cluster containing seven Zn atoms was efficiently synthesized in high yield via a template effect of a trisaloph ligand and characterized by NMR, MS, X-ray crystallography, etc. The homo cluster can be converted quantitatively to Zn3·La hetero metal cluster.
The reactions of 2,6-bis[(phenylthio- or
phenylseleno)methyl]phenyl phenyl telluride or
the
corresponding Te-oxide, with NOBF4 or
trifluoromethanesulfonic anhydride afforded the new telluranes,
[10−Te−4(C2X2)]2+·2Y-
(λ4-tellane) (X = S or Se, Y = BF4 or
CF3SO3). These compounds were
characterized
by elemental and spectroscopic (FABMS, 1H, 13C,
and 125Te NMR) analyses. X-ray structure
determinations
revealed that the hypervalent tellurium atoms are at the center of a
distorted trigonal bipyramid, with two
apical sulfonio or selenonio ligands connected via transannular bonds.
The Te−S distances are in the range
2.652−2.706 Å, the Te−Se distances in the range 2.759−2.807 Å,
and the X−Te−X bond angles in the range
160.41−163.92 °. Ab initio calculations indicate
that the positive charges in the dications are exclusively
on
the three chalcogen atoms that form three-center, four-electron
bonds.
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