Acta Cryst. (2004). E60, o1305-o1306  [ doi:10.1107/S1600536804016216 ]

Pyrazine-2,3-dicarboxylic acid

T. Premkumar, S. Govindarajan, W. Starosta and J. Leciejewicz

Online 9 July 2004

Key indicators

• Single-crystal X-ray study
• T = 573 K
• Mean (C-C) = 0.003 Å
• R factor = 0.031
• wR factor = 0.110
• Data-to-parameter ratio = 9.7

checkCIF/PLATON results

No syntax errors found




Alert level C
PLAT088_ALERT_3_C Poor Data / Parameter Ratio ....................       9.73       
PLAT125_ALERT_4_C No _symmetry_space_group_name_Hall Given .......          ?
PLAT250_ALERT_2_C Large U3/U1 Ratio for Average U(i,j) Tensor ....       2.21       
PLAT250_ALERT_2_C Large U3/U1 Ratio for Average U(i,j) Tensor ....       2.32       

   0 ALERT level A = In general: serious problem
   0 ALERT level B = Potentially serious problem
   4 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
   1 ALERT type 3 Indicator that the structure quality may be low
   1 ALERT type 4 Improvement, methodology, query or suggestion

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