Diammine(2,2'-bipyridine)-bis(thio-cyan-ato--κN)cobalt(III) diamminetetra-kis(thio-cyanato--κN)chromate(III) aceto-nitrile disolvate.

The new heterometallic title complex, [Co(NCS)(2)(C(10)H(8)N(2))(NH(3))(2)][Cr(NCS)(4)(NH(3))(2)]·2CH(3)CN, has been prepared using the open-air reaction of cobalt powder, Reineckes salt and 2,2'-bipyridine (dpy) in acetonitrile. The crystal structure consists of discrete cationic [Co(NCS)(2)(NH(3))(2)(dpy)](+) and anionic [Cr(NCS)(4)(NH(3))(2)](-) building blocks, both with 2 symmetry, and acetonitrile solvent mol-ecules, which are linked together by N-H⋯N hydrogen bonds, forming extended supra-molecular chains. Furthermore, N-H⋯S, C-H⋯S and C-H⋯N hydrogen bonds inter-link neighbouring chains into a three-dimensional framework. The Co atom is in an elongated octa-hedral coordination environment with two N atoms from the dpy ligands and two NCS-groups in the equatorial plane and with two NH(3) mol-ecules at the axial positions. The Cr(III) ion is octa-hedraly coordinated by two NH(3) mol-ecules at the axial positions and four NCS-groups in the equatorial plane. Intensity statistics indicated non-merohedral twinning with the twin matrix [100; 0[Formula: see text]0; [Formula: see text]0[Formula: see text]]. The refined ratio of the twin components is 0.530 (1):0.470 (1).

Direct synthesis of an heterometallic {Mn(II)3Cr(III)4} wheel by decomposition of Reineckes salt.

A new heterometallic Mn/Cr molecular wheel complex has been synthesized using zerovalent manganese, Reineckes salt, ammonium thiocyanate and triethanolamine (H(3)tea) as starting materials. The compound [Mn(3)Cr(4)(NCS)(6)(Htea)(6)] (1) has been characterized in terms of its electrochemical, IR and EPR spectroscopic as well as its magnetic properties. The magnetic susceptibility and magnetization data were treated simultaneously during the optimization routine and resulted in J(Mn-Cr) = +0.43 cm(-1), J(Cr-Cr) = -4.75 cm(-1), J(Mn-Mn) = +1.78 cm(-1), g(eff) = 1.878 with the ground state S = 15/2.