#------------------------------------------------------------------------------
#$Date: 2014-03-15 08:38:07 +0000 (Sat, 15 Mar 2014) $
#$Revision: 106285 $
#$URL: svn://www.crystallography.net/cod/cif/2/20/06/2200608.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/. The original data for this entry
# were provided by IUCr Journals, http://journals.iucr.org/.
#
# The file may be used within the scientific community so long as
# proper attribution is given to the journal article from which the
# data were obtained.
#
data_2200608
loop_
_publ_author_name
'Kaiser-Morris, Erika'
'Nicola\"i, Beatrice'
'Cousson, Alain'
'Paulus, Werner'
'Fillaux, Francois'
_publ_section_title
;
 2,6-Dimethylpyrazine at 20K: a neutron-diffraction study
;
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o1113
_journal_page_last               o1115
_journal_volume                  57
_journal_year                    2001
_chemical_formula_iupac          'C6 H8 N2'
_chemical_formula_moiety         'C6 H8 N2'
_chemical_formula_sum            'C6 H8 N2'
_chemical_formula_weight         108.14
_chemical_name_common            2,6DMP
_chemical_name_systematic
;
2,6-dimethylpyrazine
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yab'
_symmetry_space_group_name_H-M   'P 1 21/a 1'
_cell_angle_alpha                90
_cell_angle_beta                 90.10(8)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.288(5)
_cell_length_b                   10.730(10)
_cell_length_c                   7.444(7)
_cell_measurement_reflns_used    16
_cell_measurement_temperature    20
_cell_measurement_theta_max      21.5
_cell_measurement_theta_min      9.8
_cell_volume                     582.1(9)
_computing_cell_refinement
;
DIF4N
;
_computing_data_collection
' DIF4N (modified Linux version of DIF4; Stoe & Cie; 2000)'
_computing_data_reduction
'PRON (modified version of REDU4; Stoe & Cie, 2000)'
_computing_molecular_graphics    'CAMERON (Watkin, Prout & Pearce, 1996)'
_computing_publication_material  CRYSTALS
_computing_structure_refinement
'CRYSTALS (Watkin, Prout, Carruthers & Betteridge, 1996)'
_diffrn_measurement_device
'       Orph\'ee reactor (Saclay, France): 5C2 four-circle'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  Cu_(220)
_diffrn_radiation_source         Orph\'ee_reactor_Saclay_France
_diffrn_radiation_type           Neutron
_diffrn_radiation_wavelength     .8308
_diffrn_reflns_av_R_equivalents  .074
_diffrn_reflns_limit_h_max       2
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            2230
_diffrn_reflns_theta_max         37.5
_diffrn_reflns_theta_min         1
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  450
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    .08
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            white
_exptl_crystal_density_diffrn    1.23
_exptl_crystal_density_meas      'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             114.73
_exptl_crystal_size_max          5.0
_exptl_crystal_size_mid          5.0
_exptl_crystal_size_min          5.0
_refine_diff_density_max         .83
_refine_diff_density_min         -.89
_refine_ls_extinction_coef       1.52(13)
_refine_ls_extinction_method     'Larson, 1970'
_refine_ls_goodness_of_fit_ref   1.0328
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     146
_refine_ls_number_reflns         1337
_refine_ls_R_factor_gt           .0311
_refine_ls_shift/su_max          .007
_refine_ls_structure_factor_coef F
_refine_ls_weighting_details
;
 Chebychev polynomial with 5 parameters:
1.04, -3.06, -0.108, -0.644, -0.800 (Carruthers & Watkin, 1979)
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         .0186
_reflns_number_gt                1337
_reflns_number_total             1918
_reflns_threshold_expression     I>3\s(I)
_[local]_cod_data_source_file    cf6105.cif
_[local]_cod_data_source_block   I
_[local]_cod_cif_authors_sg_H-M  'P 21/a'
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value 'not measured' was changed to '?' -
the value is undefined or not given.

'_refine_ls_weighting_scheme'
value ' calc' changed to 'calc' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        582.4
_cod_database_code               2200608
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
-x,-y,-z
-x+1/2,y+1/2,-z
x+1/2,-y+1/2,z
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
_atom_site_adp_type
_atom_site_occupancy
N1 .12257(8) .98276(5) .23638(8) .0070 Uani 1.0000
N2 .19670(7) .74325(5) .36768(7) .0057 Uani 1.0000
C1 .19500(11) .96465(7) .39920(10) .0062 Uani 1.0000
C2 .23295(11) .84500(7) .46580(10) .0052 Uani 1.0000
C3 .12450(10) .76032(7) .20383(11) .0049 Uani 1.0000
C4 .08847(11) .88000(7) .13941(11) .0060 Uani 1.0000
C5 .31567(12) .82858(8) .64895(11) .0080 Uani 1.0000
C6 .08306(11) .64661(8) .09342(11) .0079 Uani 1.0000
H11 .2239(3) 1.04718(17) .4806(3) .0215 Uani 1.0000
H41 .0295(3) .8933(2) .0052(3) .0205 Uani 1.0000
H51 .3174(6) .7323(2) .6885(4) .0437 Uani 1.0000
H52 .4564(4) .8622(4) .6503(4) .0447 Uani 1.0000
H53 .2403(5) .8820(3) .7480(3) .0439 Uani 1.0000
H61 .0101(6) .6703(3) -.0285(4) .0422 Uani 1.0000
H62 .2068(3) .5988(3) .0548(5) .0441 Uani 1.0000
H63 .0000(5) .5815(2) .1698(4) .0374 Uani 1.0000
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
N1 .0092(2) .0050(2) .0067(2) .00117(18) -.00155(17) .00074(17)
N2 .0075(2) .0043(2) .0052(2) .00022(17) -.00173(19) .00042(16)
C1 .0090(3) .0033(3) .0062(3) .0001(2) -.0013(2) -.0004(2)
C2 .0071(3) .0046(3) .0041(3) -.0003(2) -.0014(2) .0002(2)
C3 .0058(3) .0048(3) .0042(3) -.0004(2) -.0013(2) -.0001(2)
C4 .0073(3) .0052(3) .0053(3) .0002(2) -.0017(2) .0010(2)
C5 .0111(3) .0075(3) .0054(3) -.0002(3) -.0035(3) -.0002(2)
C6 .0087(3) .0067(3) .0083(3) -.0007(3) -.0021(3) -.0020(3)
H11 .0320(10) .0122(7) .0198(8) .0016(7) -.0060(7) -.0047(6)
H41 .0271(9) .0196(8) .0147(7) .0013(7) -.0088(7) .0026(6)
H51 .081(2) .0180(9) .0319(13) -.0042(12) -.0274(14) .0070(8)
H52 .0250(10) .078(2) .0317(11) -.0182(13) -.0105(9) .0152(13)
H53 .0547(16) .0587(18) .0184(9) .0308(15) -.0010(10) -.0110(10)
H61 .070(2) .0286(12) .0280(11) .0020(12) -.0292(13) -.0041(9)
H62 .0210(10) .0407(14) .071(2) .0046(9) .0017(11) -.0339(14)
H63 .0537(16) .0260(11) .0325(11) -.0220(11) .0127(11) -.0061(8)
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_site_symmetry_1
_geom_bond_site_symmetry_2
_geom_bond_distance
_geom_bond_publ_flag
N1 C1 . . 1.3354(9) yes
N1 C4 . . 1.3410(10) yes
N2 C2 . . 1.3399(9) yes
N2 C3 . . 1.3400(10) yes
C1 C2 . . 1.4040(11) yes
C1 H11 . . 1.0937(19) no
C2 C5 . . 1.5005(11) yes
C3 C4 . . 1.3960(11) yes
C3 C6 . . 1.5019(11) yes
C4 H41 . . 1.0963(19) no
C5 H51 . . 1.074(2) no
C5 H52 . . 1.087(3) no
C5 H53 . . 1.084(3) no
C6 H61 . . 1.081(3) no
C6 H62 . . 1.078(2) no
C6 H63 . . 1.086(3) no
loop_
_atom_type_symbol
_atom_type_scat_dispersion_real
_atom_type_scat_dispersion_imag
_atom_type_scat_source
'O   ' .0000 .0000 'Sears (1992)'
'C   ' .0000 .0000 'Sears (1992)'
'N   ' .0000 .0000 'Sears (1992)'
'H   ' .0000 .0000 'Sears (1992)'
loop_
_geom_angle_atom_site_label_1
_geom_angle_atom_site_label_2
_geom_angle_atom_site_label_3
_geom_angle
_geom_angle_publ_flag
C1 N1 C4 116.19(6) yes
C2 N2 C3 117.47(6) yes
N1 C1 C2 122.06(7) yes
N1 C1 H11 117.42(13) no
C2 C1 H11 120.51(13) no
N2 C2 C1 120.99(7) yes
N2 C2 C5 118.56(7) yes
C1 C2 C5 120.45(7) yes
N2 C3 C4 120.78(7) yes
N2 C3 C6 117.72(7) yes
C4 C3 C6 121.50(7) yes
N1 C4 C3 122.51(7) yes
N1 C4 H41 117.06(13) no
C3 C4 H41 120.43(13) no
C2 C5 H51 111.49(16) no
C2 C5 H52 110.32(15) no
H51 C5 H52 107.8(3) no
C2 C5 H53 110.67(16) no
H51 C5 H53 109.1(3) no
H52 C5 H53 107.3(3) no
C3 C6 H61 111.48(16) no
C3 C6 H62 111.47(15) no
H61 C6 H62 107.4(3) no
C3 C6 H63 110.40(15) no
H61 C6 H63 108.5(3) no
H62 C6 H63 107.5(3) no
_cod_database_fobs_code 2200608
_journal_paper_doi 10.1107/S1600536801017834
_diffrn_radiation_probe neutron