Abstract
The N 2 S 2 ligand N,N'-dimethyl-N,N'-bis(β-mercaptoethyl)ethylenediamine, H 2 L, reacts with NiCl 2 •6H 2 O in methanol solution to yield a trinuclear species of stoichiometry [Ni 3 L 2 ]Cl 2 •2H 2 O. This compound crystallizes in the monoclinic space group P2 1 /n with a=19.917 (7) A, b=5.453 (3) A, c=13.508 (6) A, β=100.81 (4)°, and Z=2. The trinuclear unit consists of two pseudosquare-planar terminal NiN 2 S 2 environments arranged in a chair conformation about a central NiS 4 plane, with the central nickel occupying a crystallographic inversion center. A dihedral angle of 107.84 (7)° exists between nickel planes unrelated by symmetry. Ni-N distances are 1.938 (4) and 1.951 (3) A, Ni-S distances in the NiN 2 S 2 environment are 2.144 (1) and 2.160 (1) A, and Ni-S distances of the NiS 4 center are 2.219 (1) and 2.216 (1) A. The same lignad, under aprotic conditions, reacts with bis(acetylacetonato)nickel(II) to give a neutral mononuclear [NiL] unit with an NiN 2 S 2 chromophore. The trinuclear and mononuclear species are compared with respect to their syntheses and NMR and electronic absorption spectra
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