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The hydrogen chromate ion may be protonated, with the formation of molecular chromic acid, H 2 CrO 4, but the pK a for the equilibrium H 2 CrO 4 ⇌ HCrO − 4 + H + is not well characterized. Reported values vary between about −0.8 and 1.6. [4] The dichromate ion is a somewhat weaker base than the chromate ion: [5]
Subjecting the DBA dianion to 4,4'-dimethylbenzophenone affords the expected [4+2] cycloaddition products, with a C-O bridge originating from the carbonyl. However, subjecting the DBA dianion to 3,3-dimethyl-1-butyne does not lead to a [4+2] cycloaddition product, but rather a C(sp)-H activation product.
The dichromate ion, Cr 2 O 2− 7, is predominant in more concentrated solutions, except at high pH. The species H 2 CrO 4 and HCr 2 O − 7 are not shown as they are formed only at very low pH. Predominance diagrams can become very complicated when many polymeric species can be formed, [ 10 ] such as in vanadates , molybdates , and tungstates .
A dianion is an anion with a net charge of −2. While there exist many stable molecular dianions, such as BeF 4 2− and MgF 4 2−, [1] thus far no stable atomic dianion has been found: Electron shielding and other quantum mechanical effects tend to make the addition of another electron to an atomic anion unstable. [2]
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The dithionite is the oxyanion with the formula [S 2 O 4] 2−. [1] It is commonly encountered as the salt sodium dithionite. For historical reasons, it is sometimes called hydrosulfite, but it contains no hydrogen and is not a sulfite. [2] The dianion has a steric number of 4 and trigonal pyramidal geometry.
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