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Magnesium Cyanide or Isocyanide?

ABSTRACT: Preference for the binding mode of the CN- ligand to Mg (Mg-CN vs. Mg-NC) is investigated. A monomeric Mg complex with a terminal CN ligand was prepared using the dipyrromethene ligand Mes DPM which successfully blocks dimerization. While reaction of (Mes DPM)MgN(SiMe3 )2 with Me3 SiCN gave the coordination complex (Mes DPM)MgN(SiMe3 )2 ?NCSiMe3 , reaction with (Mes DPM)Mg(nBu) led to (Mes DPM)MgNC?(THF)2 . A Mg-NC/Mg-CN ratio of ?95:5 was established by crystal-structure determination and DFT calculations. IR studies show absorbances for CN stretching at 2085?cm-1 (Mg-NC) and 2162?cm-1 (Mg-CN) as confirmed by 13 C labeling. In solution and in the solid state, the CN ligand rotates within the pocket. The calculated isomerization barrier is only 12.0?kcal?mol-1 and the 13 C?NMR signal for CN decoalesces at -85?°C (Mg-NC: 175.9?ppm, Mg-CN: 144.3?ppm). Experiment and theory both indicate that Mg complexes with the CN- ligand should not be named cyanides but are more properly defined as isocyanides.

SUBMITTER: Ballmann G

PROVIDER: S-EPMC6856803 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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Magnesium Cyanide or Isocyanide?

Ballmann Gerd G Elsen Holger H Harder Sjoerd S

Angewandte Chemie (International ed. in English) 20190918 44

Preference for the binding mode of the CN- ligand to Mg (Mg-CN vs. Mg-NC) is investigated. A monomeric Mg complex with a terminal CN ligand was prepared using the dipyrromethene ligand Mes DPM which successfully blocks dimerization. While reaction of (Mes DPM)MgN(SiMe3 )2 with Me3 SiCN gave the coordination complex (Mes DPM)MgN(SiMe3 )2 ⋅NCSiMe3 , reaction with (Mes DPM)Mg(nBu ...[more]

PMID: 31461208

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