FIGURE 18.28 • The structure of cyanocobalamin (top) and simplified structures showing several coenzyme forms of vitamin B12. The Co—C bond of 5'-deoxyadenosylcobalamin is predominantly covalent (note the short bond length of 0.205 nm) but with some ionic character. Note that the convention of writing the cobalt atom as Co3+ attributes the electrons of the Co—C and Co—N bonds to carbon and nitrogen, respectively.

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