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E 4 Butterfly Complexes (E=P, As) as Chelating Ligands
Author(s) -
Schwarzmaier Christoph,
Heinl Sebastian,
Balázs Gábor,
Scheer Manfred
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201506784
Subject(s) - butterfly , chelation , chemistry , butterfly effect , stereochemistry , computer science , biology , inorganic chemistry , ecology , artificial intelligence , chaotic
The coordination properties of new types of bidentate phosphane and arsane ligands with a narrow bite angle are reported. The reactions of [{Cp′′′Fe(CO) 2 } 2 (μ,η 1:1 ‐P 4 )] ( 1 a ) with the copper salt [Cu(CH 3 CN) 4 ][BF 4 ] leads, depending on the stoichiometry, to the formation of the spiro compound [{{Cp′′′Fe(CO) 2 } 2 (μ 3 ,η 1:1:1:1 ‐P 4 )} 2 Cu] + [BF 4 ] − ( 2 ) or the monoadduct [{Cp′′′Fe(CO) 2 } 2 (μ 3 ,η 1:1:2 ‐P 4 ){Cu(MeCN)}] + [BF 4 ] − ( 3 ). Similarly, the arsane ligand [{Cp′′′Fe(CO) 2 } 2 (μ,η 1:1 ‐As 4 )] ( 1 b ) reacts with [Cu(CH 3 CN) 4 ][BF 4 ] to give [{{Cp′′′Fe(CO) 2 } 2 (μ 3 ,η 1:1:1:1 ‐As 4 )} 2 Cu] + [BF 4 ] − ( 5 ). Protonation of 1 a occurs at the “wing tip” phosphorus atoms, which is in line with the results of DFT calculations. The compounds are characterized by spectroscopic methods (heteronuclear NMR spectroscopy and IR spectrometry) and by single‐crystal X‐ray diffraction studies.