Synthesis and properties of an optically active helical bis-cobaltocenium ion was written by Gilbert, Adam M.;Katz, Thomas J.;Geiger, William E.;Robben, Matthew P.;Rheingold, Arnold L.. And the article was included in Journal of the American Chemical Society in 1993.Category: esters-buliding-blocks This article mentions the following:
The optically active helical bis-cobaltocenium salt I is synthesized, as are two related monocobaltocenium salts, 29 and 30. The structure of I is analyzed by x-ray diffraction, which shows that the metals are separated by 8.49 Å. Reducing I either electrochem. or with K(Hg) produces species that absorb near 920 nm, but the absorption is not an intervalence transition. It originates instead from isolated Co(II) centers. This is demonstrated by the reduction product of 29, which has only one cobalt, also absorbing at a similar wavelength (λmax = 957 nm). The optical and ESR spectra imply that the unpaired electron in monoreduced I is largely localized on cobalt and that direduced I is essentially a Co(II)/Co(II) diradical. The difference between two Co(III)/Co(II) reduction potentials of I, 130 mV, is shown to be appropriate for a conjugated dimetallocene with metals so distant. In the experiment, the researchers used many compounds, for example, Ethyl 3-amino-4-methylbenzoate (cas: 41191-92-8Category: esters-buliding-blocks).
Ethyl 3-amino-4-methylbenzoate (cas: 41191-92-8) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Category: esters-buliding-blocks
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics