Acta Cryst. (2001). E57, i90-i91  [ doi:10.1107/S160053680101501X ]

A new modification of diammonium hexafluorosilicate, (NH₄)₂SiF₆

J. Fábry, J. Chval and V. Petrícek

Online 29 September 2001

Key indicators

• Single-crystal X-ray study
• T = 290 K
• Mean (Si-F) = 0.001 Å
• R factor = 0.018
• wR factor = 0.022
• Data-to-parameter ratio = 11.6

checkCIF results

No syntax errors found

ADDSYM reports no extra symmetry


 Alert Level C:



PLAT_420  Alert C D-H Without Acceptor       N(2)   -   H(22N)            ?

General Notes



REFLT_03                                                                        
         From the CIF: _diffrn_reflns_theta_max           29.98                 
         From the CIF: _reflns_number_total                361                  
         Count of symmetry unique reflns          191                           
         Completeness (_total/calc)            189.01%                          
         TEST3: Check Friedels for noncentro structure                          
         Estimate of Friedel pairs measured       170                           
         Fraction of Friedel pairs measured     0.890                           
         Are heavy atom types Z>Si present          yes                         
          Please check that the estimate of the number of Friedel pairs is      
          correct. If it is not, please give the correct count in the           
          _publ_section_exptl_refinement section of the submitted CIF.          


 0 Alert Level A = Potentially serious problem

 0 Alert Level B = Potential problem

 1 Alert Level C = Please check

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