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Reference.org
Difluorine complex
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<p>A difluorine complex is a molecular complex involving a difluorine molecule (F2) and another molecule. The first example was <a href="/facts/Gold_heptafluoride/efHKnNII">gold heptafluoride</a> (AuF7). Instead of being a gold(VII) compound, AuF7 is an adduct of <a href="/facts/Gold_pentafluoride/63TzwqtE">gold pentafluoride (AuF5)</a> and <a href="/facts/Difluorine/YUV0Fb8m">F2</a>. This conclusion has been repeatedly supported by calculations. Unlike <a href="/facts/Dihydrogen_complex/InuKTLfg">dihydrogen complexes</a>, which feature η2-H2, difluorine complexes feature "end-on" or η1-F2 <a href="/facts/Ligand/6etB3qeW">ligand</a>. </p>