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Acta Cryst. (2013). E69, o1218-o1219  [ doi:10.1107/S1600536813018242 ]

Bis(1,3-dimethyl-1H-imidazolium) hexafluorosilicate: the second monoclinic polymorph

C. Tian, W. Nie and M. V. Borzov

Key indicators

checkCIF/PLATON results

No syntax errors found

Alert level C PLAT242_ALERT_2_C Check Low Ueq as Compared to Neighbors for Si1 PLAT910_ALERT_3_C Missing # of FCF Reflections Below Th(Min) ..... 1 PLAT911_ALERT_3_C Missing # FCF Refl Between THmin & STh/L= 0.600 6
Alert level G PLAT005_ALERT_5_G No _iucr_refine_instructions_details in the CIF ? Do ! PLAT112_ALERT_2_G ADDSYM Detects Additional (Pseudo) Symm. Elem... I
Author Response: [SiF~6~^2--^] dianions located at the vertices and the volume centre of the unit cell are related by an <i>n</i>-glide plane symmetry operation. No centering <i>I</i>-translation is present.
PLAT128_ALERT_4_G Note: Alternate Setting of Space-group P21/c   .      P21/n      
PLAT961_ALERT_5_G Dataset Contains no Negative Intensities .......          ! Check

0 ALERT level A = Most likely a serious problem - resolve or explain 0 ALERT level B = A potentially serious problem, consider carefully 3 ALERT level C = Check. Ensure it is not caused by an omission or oversight 4 ALERT level G = General information/check it is not something unexpected 0 ALERT type 1 CIF construction/syntax error, inconsistent or missing data 2 ALERT type 2 Indicator that the structure model may be wrong or deficient 2 ALERT type 3 Indicator that the structure quality may be low 1 ALERT type 4 Improvement, methodology, query or suggestion 2 ALERT type 5 Informative message, check

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