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Ba[H 4 C 4 O 10 ][H 3 C 4 O 10 ][H 2 CO 3 ][HCO 3 ] is the first mixed sp 2 /sp 3 -carbonate containing both carbon trigonally coordinated in [CO 3 ] 2− -groups and tetrahedrally coordinated in [CO 4 ] 4− -groups.
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Spahr et al. (2024) studied this question.
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