Acta Cryst. (2004). E60, o1449-o1450  [ doi:10.1107/S1600536804018379 ]

4-Methoxypyridinium betaine of squaric acid

T. Kolev, R. Wortmann, M. Spiteller, W. S. Sheldrick and H. Mayer-Figge

Online 31 July 2004

Key indicators

• Single-crystal X-ray study
• T = 293 K
• Mean (C-C) = 0.003 Å
• R factor = 0.044
• wR factor = 0.107
• Data-to-parameter ratio = 10.9

checkCIF/PLATON results

No syntax errors found




Alert level C
PLAT369_ALERT_2_C Long   C(sp2)-C(sp2) Bond  C12    -   C13    ...       1.53 Ang.  
PLAT369_ALERT_2_C Long   C(sp2)-C(sp2) Bond  C13    -   C14    ...       1.53 Ang.  

   0 ALERT level A = In general: serious problem
   0 ALERT level B = Potentially serious problem
   2 ALERT level C = Check and explain
   0 ALERT level G = General alerts; check

   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
   0 ALERT type 3 Indicator that the structure quality may be low
   0 ALERT type 4 Improvement, methodology, query or suggestion

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