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(2.2.2-Cryptand)potassium tetra-kis-(?(2)-ethyl-ene)cobaltate(-I).

ABSTRACT: The title salt, [K(C(18)H(36)N(2)O(6))][Co(C(2)H(4))(4)], is one of only two known homoleptic ethyl-enemetalates. The cation and anion are well separated, which gives an unperturbed tetra-hedral anion as is expected for a formally Co(-I)d(10) metal center. The considerable elongation of the C=C bonds of the ethyl-ene ligands [average 1.401?(6)?Å], relative to that of free ethyl-ene (1.333?Å), is consistent with metal??* back-bonding models. One arm of the 2.2.2-cryptand (4,7,13,16,21,24-hexa-oxa-1,10-diaza-bicyclo-[8.8.8]hexa-cosa-ne) complexant is disordered and was modeled over two positions with a refined occupancy ratio of 0.559?(2):0.441?(2). In the crystal, the cationic K(2.2.2-cryptand) units are linked via C-H?O hydrogen bonds, forming inversion dimers. There are no other significant inter-molecular inter-actions in the crystal structure.

SUBMITTER: Brennessel WW

PROVIDER: S-EPMC3470144 | biostudies-literature | 2012 Oct

REPOSITORIES: biostudies-literature

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(2.2.2-Cryptand)potassium tetra-kis-(η(2)-ethyl-ene)cobaltate(-I).

Brennessel William W WW Ellis John E JE

Acta crystallographica. Section E, Structure reports online 20120912 Pt 10

The title salt, [K(C(18)H(36)N(2)O(6))][Co(C(2)H(4))(4)], is one of only two known homoleptic ethyl-enemetalates. The cation and anion are well separated, which gives an unperturbed tetra-hedral anion as is expected for a formally Co(-I)d(10) metal center. The considerable elongation of the C=C bonds of the ethyl-ene ligands [average 1.401 (6) Å], relative to that of free ethyl-ene (1.333 Å), is consistent with metal→π* back-bonding models. One arm of the 2.2.2-cryptand (4,7,13,16,21,24-hexa-oxa ...[more]

PMID: 23125588

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