Abstract
The new [Co(pydz)6]2+ ion (pydz = pyridazine) has been prepared by a straightforward route in aqueous solution, and isolated as its hexafluorophosphate salt. The salt crystallizes in the monoclinic space group C2/c with a = 18.4796(3) A, b = 10.6846(2) A, c = 16.3404(2) A, β = 92.0518(11)o, V = 3224.30(9) A3, Dcalc = 1.709 at 150(1) K. The dication has crystallographically imposed 2 symmetry. The analogous, previously reported ruthenium complex ion could be isolated as its tetraphenylborate salt following the reaction of [RuCl2(1,5-COD)] x ·(COD = cyclooctadiene) with pyridazine in the presence of hydrogen gas. This salt also crystallizes in the monoclinic space group C2/c, with a = 17.8441(3) A, b = 19.8693(4) A, c = 38.4545(7) A, β = 95.4231(6)o, V = 13573.0(4) A3, Dcalc = 1.321 at 150(1) K. The hexakis(pyridazine)metal dications of cobalt and ruthenium have been synthesized and structurally characterized.
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