Reactions of RTeCl<sub>3</sub> (R = 2‑phenylazophenyl)
with Diorganophosphinic Acids. Te–C Bond Cleavage and Stabilization
of the TeO Motif in an Umbrella-Shaped Te<sub>5</sub>O<sub>11</sub>P<sub>2</sub> Multi-metallacyclic Framework
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Abstract
The
reaction of 1,1,2,3,3-pentamethyltrimethylenephosphinic acid <i>cyc</i>P(O)OH and (C<sub>6</sub>H<sub>11</sub>)<sub>2</sub>P(O)OH
with monoorganotellurium trichloride RTeCl<sub>3</sub> (R = 2-phenylazophenyl)
in benzene at room temperature afforded two pentanuclear complexes,
[(RTe)<sub>4</sub>(TeO)(μ-O)<sub>6</sub>(<i>cyc</i>PO<sub>2</sub>)<sub>2</sub>]·THF(<b>1</b>) [<i>cyc</i>PO<sub>2</sub> = 1,1,2,3,3-pentamethylene phosphinate] and [(RTe)<sub>4</sub>(TeO)(μ-O)<sub>6</sub>{(C<sub>6</sub>H<sub>11</sub>)<sub>2</sub>PO<sub>2</sub>}<sub>2</sub>]·2C<sub>6</sub>H<sub>6</sub> (<b>2</b>). The reactions leading to the formation of <b>1</b> and <b>2</b> involve a Te–C bond cleavage. <b>1</b> and <b>2</b> are isostructural complexes and contain
a Te<sub>4</sub>P<sub>2</sub>O<sub>6</sub> macrocyclic framework that
is part of a Te<sub>5</sub>O<sub>11</sub>P<sub>2</sub> multi-metallacyclic
framework. Both of these compounds contain a central inorganic TeO
connected to four other tellurium centers through four μ-O bridges
