DONOR PROPERTIES OF SIMPLE ETHERS .2. COMPLEXES OF MANGANESE(2), IRON(2), COBALT(2) AND NICKEL(2) HALIDES WITH TETRAHYDROFURAN AND 1,2-DIMETHOXYETHANE

The reactions of several dihalides of manganese(II), iron(II), cobalt(II), nickel(II), copper(II) and cadmium(II), and iron(III) chloride with tetrahydrofuran and 1,2-dimethoxyethane have been investigated and the following complexes prepared: MCl2,1·5C4H8O (M Mn, Fe or Co), CoX2,C4H8O (X Br or I), NiCl2,C4H8O,C2H5OH, MX2,C4H10O2 (M Mn, Fe, Co, Ni or Cd and X Cl, Br or I), FeCl3,C4H10O2 and 2CuCl2,C4H10O2. The structures of several of these complexes have been deduced from a study of their electronic spectra, far-i.r. spectra and room-temperature magnetic properties. However, the magnetic moments of several of these complexes (e.g. pseudotetrahedral CoX2,C4H10O2) are unusual in that they exhibit marked temperature dependence, although the ground state formally is an orbital singlet. The tetrahydrofuran derivatives MCl2,1·5C4H8O are of unusual stoichiometry, and while it is suggested that these products are a 1:1 mixture of tetrahedral CoCl2,2C4H8O and octahedral CoCl2,C4H8O their structure remains in some doubt. © 1969.