Univalent Gallium and Indium Phosphane Complexes: From Pyramidal M(PPh3)3+ to Carbene‐Analogous Bent M(PtBu3)2+ (M=Ga,In) Complexes |
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Authors: | Alexander Higelin Ulf Sachs Sarah Keller Prof?Dr Ingo Krossing |
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Institution: | Albert‐Ludwigs‐Universit?t Freiburg, Institut für Anorganische und Analytische Chemie, Freiburger Materialforschungszentrum FMF and Freiburg Institute for Advanced Studies FRIAS, Section Soft Matter Science, Albertstrasse 21, 79104 Freiburg (Germany) |
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Abstract: | In a new oxidative route, Ag+Al(ORF)4]? (RF=C(CF3)3) and metallic indium were sonicated in aromatic solvents, such as fluorobenzene (PhF), to give a precipitate of silver metal and highly soluble In(PhF)n]+ salts (n=2, 3) with the weakly coordinating Al(ORF)4]? anion in quantitative yield. The In+ salt and the known analogous Ga+Al(ORF)4]? were used to synthesize a series of homoleptic PR3 phosphane complexes M(PR3)n]+, that is, the weakly PPh3‐bridged (Ph3P)3In–(PPh3)–In(PPh3)3]2+ that essentially contains two independent In(PPh3)3]+ cations or, with increasing bulk of the phosphane, the carbene‐analogous M(PtBu3)2]+ (M=Ga, In) cations. The MI? P distances are 27 to 29 pm longer for indium, and thus considerably longer than the difference between their tabulated radii (18 pm). The structure, formation, and frontier orbitals of these complexes were investigated by calculations at the BP86/SV(P), B3LYP/def2‐TZVPP, MP2/def2‐TZVPP, and SCS‐MP2/def2‐TZVPP levels. |
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Keywords: | gallium indium phosphanes subvalent compounds weakly coordinating anions |
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