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The Influence of β-diiminato Ligands on As 4 Activation by Cobalt Complexes.
Angewandte Chemie 2018 July 10
In a systematic study of the activation of As4 , three [LCo(tol)] (L=β-diiminato) complexes have revealed different steric and electronic influences. 2,6-Diisopropylphenyl (Dipp) and 2,6-dimethylphenyl (dmp) flanking groups were used, one of the ligands with H backbone substituents (β-dialdiminate L0 ) and two with Me substituents (β-diketiminates L3 and L1 ). In the reaction with As4 , different dinuclear products [(LCo)2 As4 ] (LM=L0 (1), L1 (2), L3 (3)) were isolated, with all showing differently shaped [Co2 As4 ] cores in the solid state: octahedral in 1, prismatic in 2, and asterane-like in 3. Thermal treatment of 3 leads to the abstraction of one arsenic atom to yield [(L3 Co)2 As3 ] (4). All products were comprehensively characterized by single-crystal X-ray diffraction, FD-MS, and 1 H NMR spectroscopy. A rational explanation for the different reactivity is also proposed and DFT calculations shed light on the nature of the highly flexible [Co2 As4 ] cores.
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