Template condensation of 3-oxa-1,5-diaminopentane (L(1)) and acetone in the presence of cobalt(II), nickel(II), zinc(II), or cadmium(II) resulted in complexes of a new aminoethereal Schiff base ligand, 8,11,11-trimethyl-4, 14-dioxa-1,7,11,17-tetraazaheptadeca-7-ene (L(2)). The reduction of the zinc(II) complex with L(2) using LiAlH4 followed by treatment of alkaline solution gave free saturated N4O2 amino ether, 8,11,11-trimethyl-4,14-dioxa-1,7,11,17-tetraazaheptadecane (L(3)). A complete structural determination was carried out for the [CoL(2)](ClO4)(2). Crystals are monoclinic, space group P2(1)/c with unit cell dimensions a = 9.992(4), b = 16.131(6), c = 14.289(6) Angstrom, beta = 98.85(2)degrees, V = 2276(2) Angstrom(3), and Z = 4. Data were collected for 3899 reflections, giving final R = 0.0715 (R(w) = 0.0733) for 332 parameters. The structure represents a rare skew-trapezoidal bipiramidal polyhedron with six-coordinate cobalt(Il). Bond lengths Co-N are normal (average 2.10 Angstrom), while distances Co-O are considerably longer (2.29-2.35 Angstrom) attesting to weaker interactions. Primary amino groups of L(2) are located in trans positions, and overall ligand conformation is helical with intramolecular hydrogen bonds between protons of amino groups and alternate ether oxigen atoms of L(2).