Acta Cryst. (2005). E61, o2326-o2327  [ doi:10.1107/S1600536805020015 ]

Tetrakis(trimethylsilyl)methane

H.-W. Lerner and M. Bolte

Online 30 June 2005

Key indicators

• Single-crystal X-ray study
• T = 173 K
• Mean (i-C) = 0.011 Å
• R factor = 0.094
• wR factor = 0.237
• Data-to-parameter ratio = 12.8

checkCIF/PLATON results

No syntax errors found



Alert level A
DIFF020_ALERT_1_A  _diffrn_standards_interval_count and
            _diffrn_standards_interval_time are missing. Number of measurements
            between standards or time (min) between standards.
PLAT112_ALERT_2_A ADDSYM Detects Additional (Pseudo) Symm. Elem...         -4     

PLAT112_ALERT_2_A ADDSYM Detects Additional (Pseudo) Symm. Elem...         -4     

PLAT112_ALERT_2_A ADDSYM Detects Additional (Pseudo) Symm. Elem...         -4     

PLAT112_ALERT_2_A ADDSYM Detects Additional (Pseudo) Symm. Elem...          m     

PLAT112_ALERT_2_A ADDSYM Detects Additional (Pseudo) Symm. Elem...          m     

PLAT112_ALERT_2_A ADDSYM Detects Additional (Pseudo) Symm. Elem...          m     

PLAT113_ALERT_2_A ADDSYM Suggests Possible Pseudo/New Spacegroup .      F-43m     

Alert level B
PLAT049_ALERT_1_B Calculated Density less than 1.0 gcm-3 .........       1.00       

Alert level C
DIFMX01_ALERT_2_C  The maximum difference density is > 0.1*ZMAX*0.75
            _refine_diff_density_max given =      1.170
            Test value =      1.050
DIFMX02_ALERT_1_C  The minimum difference density is > 0.1*ZMAX*0.75
            The relevant atom site should be identified.
PLAT094_ALERT_2_C Ratio of Maximum / Minimum Residual Density ....       2.33       
PLAT097_ALERT_2_C Maximum (Positive) Residual Density ............       1.17 e/A   3
PLAT220_ALERT_2_C Large Non-Solvent    C     Ueq(max)/Ueq(min) ...       3.12 Ratio 
PLAT230_ALERT_2_C Hirshfeld Test Diff for    Si1    -   C1      ..       6.09 su    
PLAT230_ALERT_2_C Hirshfeld Test Diff for    Si2    -   C1      ..       5.89 su    
PLAT242_ALERT_2_C Check Low       Ueq as Compared to Neighbors for         C1     
PLAT764_ALERT_4_C Overcomplete CIF Bond List Detected (Rep/Expd) .       1.25 Ratio 

Alert level G
REFLT03_ALERT_4_G  WARNING: Large fraction of Friedel related reflns may
                     be needed to determine absolute structure
           From the CIF: _diffrn_reflns_theta_max           25.09
           From the CIF: _reflns_number_total                679
           Count of symmetry unique reflns          689
           Completeness (_total/calc)             98.55%
           TEST3: Check Friedels for noncentro structure
           Estimate of Friedel pairs measured         0
           Fraction of Friedel pairs measured     0.000
           Are heavy atom types Z>Si present        yes

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

   3 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
  14 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
   2 ALERT type 4 Improvement, methodology, query or suggestion

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