Accuracy

piperazine    612 Piperazine

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    #  Species Formula
   602 1,2-PropanediamineC3H10N2
   603 DicyanoacetyleneC4N2
   604 FumaronitrileC4H2N2
   605 1,3-DiazineC4H4N2
   606 PyrazineC4H4N2
   607 PyridazineC4H4N2
   608 SuccinonitrileC4H4N2
   609 2-Methyl-1H-imidazoleC4H6N2
   610 (Dimethylamino) acetonitrileC4H8N2
   611 1,4,5,6-TetrahydropyrimidineC4H8N2
   612 Piperazine C4H10N2
   613 2-AminopyridineC5H6N2
   614 3-AminopyridineC5H6N2
   615 4-AminopyridineC5H6N2
   616 Dimethyl propanedinitrileC5H6N2
   617 2-Ethyl-1H-imidazoleC5H8N2
   618 DiethylcyanamideC5H10N2
   619 ButylmethyldiazeneC5H12N2
   620 N,N-Dimethyl-1,3-propanediamineC5H14N2
   621 2-CyanopyridineC6H4N2
   622 3-CyanopyridineC6H4N2


ΔHf: 6.0 kcal/mol,     REF: NIST Chemistry WebBook, NIST Standard Reference Database, No. 69; W. G. Mallard, P. J. Linstrom, Eds., National Institute of Standards and Technology, Gaithersberg, http://webbook.nist.gov/chemistry.
  
 PM7
Piperazine
 H=6.0 HR=NIST
  N     0.00000000 +0    0.0000000 +0    0.0000000 +0     0     0     0
  C     1.47606684 +1    0.0000000 +0    0.0000000 +0     1     0     0
  C     1.54982618 +1  112.6320457 +1    0.0000000 +0     2     1     0
  N     1.48056298 +1  109.2072960 +1  -56.2069090 +1     3     2     1
  C     1.48085577 +1  111.9245964 +1   57.3973635 +1     4     3     2
  C     1.47620667 +1  109.7765869 +1   55.2718935 +1     1     2     3
  H     1.01859388 +1  110.8814246 +1 -122.6989713 +1     1     2     6
  H     1.11381896 +1  107.9144922 +1 -121.0277331 +1     2     1     3
  H     1.10830511 +1  108.9383486 +1 -115.9321500 +1     2     1     8
  H     1.11119063 +1  109.5941022 +1 -117.6523607 +1     3     2     4
  H     1.10905369 +1  110.0469463 +1 -117.7898902 +1     3     2    10
  H     1.01850892 +1  110.5780121 +1  123.7004397 +1     4     3     5
  H     1.11102581 +1  107.5604070 +1 -176.4013763 +1     5     4     3
  H     1.10879892 +1  113.0344597 +1 -118.3549954 +1     5     4    13
  H     1.10818565 +1  108.9367161 +1 -178.4721408 +1     6     1     2
  H     1.11363148 +1  108.0092220 +1 -116.0439682 +1     6     1    15