Synthesis and characterization of a series of trans-2M (R2 = Ph2, OCH2CMe2CH2O; M = Co, Ni, Cu) complexes and the crystal structure of trans-2Ni*2Et2O

Article abstract of DOI:10.1016/0022-328X(88)83006-7

A series of heterotrinuclear complexes of the type trans-2M (R2 = Ph2, OCH2CMe2CH2O; M = Co, Ni, Cu) have been synthesized and characterized by multinuclear NMR, IR and VIS-NIR spectroscopy and by measurement of solution magnetic susceptibilities.These studies indicate that the coordination environment of the high spin Co²⁺ ion is octahedral while that of the diamagnetic Ni²⁺ ion is square planar.Coordination of the Ni²⁺ ion to the mononuclear Mo(CO)5(R2PNHCH2CH2N=CHC6H4-o-OH) complexes causes quite different effects in the spectra of the diphenylphosphino and dioxaphosphirinane complexes.These differences appear to be due to differences in the intramolecular interactions between the P substituents and bis(salicylaldiminato)M groups.The molecular structure of trans-2Ni*Et2O has been determined.The complex crystallizes from an HOAc/THF/Et2O mixture in the monoclinic space group C2/c (crystal data: a 37.71(1), b 9.822(1), c 17.91(1) Angstroem; α = γ =90.00(0) deg, β = 105.45(6) deg, Z = 4).The Ni²⁺ ion is coordinated to two salicylaldiminato groups in a non-tetrahedrally distorted square planar geometry while the Mo is coordinated to five COs and a P in a slightly distorted octahedral geometry.An interesting feature of the structure is the nearly planar stacking of a phenyl ring on each P with the bis(salicylaldiminato)Ni group.