Erbium Mixed‐Ligand β‐Diketiminato‐Diamido Complex: Unusual Structure of Diamide Ligand

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Abstract
A novel mixed‐ligand erbium complex [(NacNac)ErL(THF)] ( 1 ) containing two types of sterically hindered ligands ‐ monoanionic N‐mesityl substituted β‐diketiminate (NacNac=(MesN−C(Me)CHC(Me)‐NMes) − , Mes=2,4,6‐Me 3 C 6 H 2 ) and dianionic modified diamide ligand with mesityls as the N‐aryl substituents (L=(MesN−C(H)(Me)‐C(=CH 2 )‐NMes) 2− ) ‐ was isolated from the salt metathesis reaction of [(NacNac)Er(THF) 2 ] with potassium salt of doubly reduced diazabutadiene K 2 (DAD‐Mes 2− ) (DAD‐Mes=MesN=C(Me)‐C(Me)=NMes) prepared in situ. A solid‐state structure of 1 was determined by single‐crystal X‐ray diffraction and revealed unusual asymmetrical diamide ligand with sp 3 ‐ and sp 2 ‐hybridized carbon backbone atoms and exometallacyclic double carbon‐carbon bond. In spite of the energy preference of symmetrical form of diamide ligand Lsym (Lsym=(MesN−C(Me)=C(Me)‐NMes) 2− ) calculated by DFT asymmetrical form L was found as minor product in the mixture of dipotassium salts obtained by reduction of DAD‐Mes.
Funding Information
  • Russian Science Foundation (16-13-10294)

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