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Two structures of the trinitromethane anion are reported. In tetra-n-butylammonium trinitromethanide, (C4H9)4N+.[C(NO2)3]-, the [C(NO2)3]- anion adopts the commonly observed C2v conformation, while in the Cs salt, caesium trinitromethanide, Cs+.[C(NO2)3]-, it adopts a distorted propeller conformation. Both stuctures exhibit cation-anion interactions that may influence the structure of the anion.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, tnm, cscno

fcf

Structure factor file (CIF format)
Contains datablock I

fcf

Structure factor file (CIF format)
Contains datablock II

CCDC references: 130368; 130369

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