Kollitz MR, Lappin AG, Oliver AG. Double-salt formation in crystal structures containing [Co(en)
3]Cl
3.
Acta Crystallogr C Struct Chem 2023;
79:164-169. [PMID:
37017298 DOI:
10.1107/s2053229623002711]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 03/22/2023] [Indexed: 04/06/2023] Open
Abstract
The structures of three racemic double salts of [Co(en)3]Cl3 (en is ethane-1,2-diamine, C2H8N2), namely, bis[tris(ethane-1,2-diamine-κ2N,N')cobalt(III)] hexaaquasodium(I) heptachloride, [Co(en)3]2[Na(H2O)6]Cl7, bis[tris(ethane-1,2-diamine-κ2N,N')cobalt(III)] hexaaquapotassium(I) heptachloride, [Co(en)3]2[K(H2O)6]Cl7, and ammonium bis[tris(ethane-1,2-diamine-κ2N,N')cobalt(III)] heptachloride hexahydrate, (NH4)[Co(en)3]2Cl7·6H2O, have been determined, and the structural similarities with the parent compound, tris(ethane-1,2-diamine-κ2N,N')cobalt(III) trichloride tetrahydrate, [Co(en)3]Cl3·4H2O, are highlighted. All four compounds crystallize in the trigonal space group P\overline{3}c1. When compared with the parent compound, the double salts show a modest increase in the unit-cell volume. The structure of the chiral derivative [Λ-Co(en)3]2[Na(H2O)6]Cl7 has also been redetermined at cryogenic temperatures (120 K) and the disorder noted in a previous report has been accounted for.
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