Accuracy
 hexamethyldisilane 
 
  1930 Hexamethyldisilane
  
   
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Geometry predicted using PM7
 ΔHf:  -85.8 kcal/mol,     REF:  J. B. Pedley, B. S. Iseard, "CATCH Tables of Silicon Compounds," University of Sussex, 1972
  
 SYMMETRY PM7
Hexamethyldisilane
 H=-85.8 HR=CATCH
 
  C     0.00000000 +0    0.0000000 +0    0.0000000 +0     0     0     0
 Si     1.87872362 +1    0.0000000 +0    0.0000000 +0     1     0     0
 Si     2.23890693 +1  110.7875350 +1    0.0000000 +0     2     1     0
  C     1.87872362 +0  110.7875350 +0  179.7746360 +0     3     2     1
  C     1.87872362 +0  110.7875350 +0  -59.1227150 +0     2     3     4
  C     1.87872362 +0  110.7875350 +0   59.0445850 +0     2     3     4
  C     1.87872362 +0  110.7875350 +0   59.8420920 +0     3     2     1
  C     1.87872362 +0  110.7875350 +0  -60.0653050 +0     3     2     1
  H     1.10461863 +1  111.6895378 +1  179.9943390 +0     1     2     3
  H     1.10461863 +0  111.6895378 +0   59.9485220 +0     1     2     3
  H     1.10461863 +0  111.6895378 +0  -59.9674700 +0     1     2     3
  H     1.10461863 +0  111.6895378 +0  179.9479190 +0     5     2     6
  H     1.10461863 +0  111.6895378 +0   59.9310510 +0     5     2     6
  H     1.10461863 +0  111.6895378 +0  -60.0917390 +0     5     2     6
  H     1.10461863 +0  111.6895378 +0 -179.9496160 +0     6     2     5
  H     1.10461863 +0  111.6895378 +0   60.0905180 +0     6     2     5
  H     1.10461863 +0  111.6895378 +0  -59.9349210 +0     6     2     5
  H     1.10461863 +0  111.6895378 +0  179.9994970 +0     4     3     2
  H     1.10461863 +0  111.6895378 +0   59.9926220 +0     4     3     2
  H     1.10461863 +0  111.6895378 +0  -59.9719780 +0     4     3     2
  H     1.10461863 +0  111.6895378 +0 -179.9749080 +0     7     3     8
  H     1.10461863 +0  111.6895378 +0   60.0589660 +0     7     3     8
  H     1.10461863 +0  111.6895378 +0  -59.9615870 +0     7     3     8
  H     1.10461863 +0  111.6895378 +0  179.9789100 +0     8     3     7
  H     1.10461863 +0  111.6895378 +0   59.9645280 +0     8     3     7
  H     1.10461863 +0  111.6895378 +0  -60.0544520 +0     8     3     7
 
   2  1    4    5    6    7    8
   4  2    5    6    7    8
   9  1   10   11   12   13   14   15   16   17   18   19
   9  1   20   21   22   23   24   25   26
   9  2   10   11   12   13   14   15   16   17   18   19
   9  2   20   21   22   23   24   25   26
   3  2    4    5    6    7    8