Synthesis characterisation and stability of mixed aryldichalcogenide bis(diphenylphosphino)ethanenickel(II) complexes. X-ray structure of Ni(dppe)(SeC_6H_4S)

摘要

Mixed chalcogenide complexes of the type Ni(dppe)(SeC_6H_4S) (dppe = bis(diphenylphosphino)ethane), Ni(dppe)(SC_5H_3NCO_2) and Ni(dppe)(EC_5H_3NE') (E = NH, E' = O; E = E' = NH) have been prepared from the reactions of Ni(dppe)Cl_2 with the appropriate aryldichalcogen or pyridine-based compound, using Et_3N as a base. The relative solution and thermal stabilities of the above compounds. other mixed chalcogen ones, Ni(dppe)(SC_6H_4O), Ni(dppe)(SC_6H_4CO_2) and Ni(dppe)(SC_6H_4NH), and the homoleptic compounds Ni(dppe)(EC_6H_4E') (E = E' = O, E = E' = S; R = H, Me), were established by a combination of electron impact mass spectrometry (EIMS) and fast atom bombardment (FABMS). The most stable ones were the compounds with homoleptic sulfur ligands.