##############################################################################
###                                                                        ###
###        Electronic paper (Acta Crystallographica Section E)             ###
###                                                                        ###
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#                                                                            #
# This CIF contains the data in a paper accepted for publication in Acta     #
# Crystallographica Section E. It conforms to the requirements of Notes      #
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# are given in the paper "The Crystallographic Information File (CIF):       #
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# Allen and I. D. Brown [Acta Cryst. (1991), A47, 655-685].                  #
#                                                                            #
# The current version of the core CIF dictionary is obtainable from          #
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data_global
_audit_creation_method     SHELXL-97
_journal_date_recd_electronic     2009-12-08
_journal_date_accepted     2009-12-10
_journal_name_full     'Acta Crystallographica, Section E'
_journal_year     2010
_journal_volume     66
_journal_issue      1
_journal_page_first     o178
_journal_page_last     o179
_journal_paper_category     QO
_journal_coeditor_code     LH2969
_publ_contact_author_name     ' Edward RT Tiekink '
_publ_contact_author_address
;
Department of Chemistry, University of Malaya,
50603 Kuala Lumpur, Malaysia
;
_publ_contact_author_email
;
edward.tiekink@gmail.com
;
_publ_contact_author_fax     ' +60 3 7967 4193 '
_publ_contact_author_phone     ' +60 3 7967 4204 '
_publ_section_title
;
N'-[(E)-2,6-Dichlorobenzylidene]pyrazine-2-carbohydrazide
;
loop_
    _publ_author_name
    _publ_author_footnote
    _publ_author_address
    'Howie, R. Alan' .
;
Department of Chemistry, University of Aberdeen, Old Aberdeen, AB15 5NY
Scotland
;
    'Souza, Marcus V. N. de' .
;
Fundação Oswaldo Cruz,
Instituto de Tecnologia em Farmacos - FarManguinhos,
Rua Sizenando Nabuco, 100,
Manguinhos
21041-250 Rio de Janeiro, RJ, Brazil
;
    'Wardell, Solange M. S. V.' .
;
CHEMSOL, 1 Harcourt Road, Aberdeen AB15 5NY, Scotland
;
    'Wardell, James L.'
;
Additional correspondence author, e-mail: j.wardell@abdn.ac.uk.
;
;
Centro de Desenvolvimento Tecnológico em Saúde (CDTS),
Fundação Oswaldo Cruz (FIOCRUZ), Casa Amarela,
Campus de Manguinhos, Av. Brasil 4365,
21040-900 Rio de Janeiro, RJ, Brazil
;
    'Tiekink, Edward R. T.' .
;
Department of Chemistry, University of Malaya,
50603 Kuala Lumpur, Malaysia
;
data_I
_audit_creation_method     SHELXL-97
_chemical_name_systematic
;
N'-[(E)-2,6-Dichlorobenzylidene]pyrazine-2-carbohydrazide
;
_chemical_name_common     ?
_chemical_formula_moiety     'C12 H8 Cl2 N4 O'
_chemical_formula_sum     'C12 H8 Cl2 N4 O'
_chemical_formula_iupac     'C12 H8 Cl2 N4 O'
_chemical_formula_weight     295.12
_chemical_melting_point     ?
_symmetry_cell_setting     monoclinic
_symmetry_space_group_name_H-M     'P 21/n'
_symmetry_space_group_name_Hall     '-P 2yn'
loop_
    _symmetry_equiv_pos_as_xyz
    'x, y, z'
    'x+1/2, -y+1/2, z+1/2'
    '-x, -y, -z'
    '-x-1/2, y-1/2, -z-1/2'
_cell_length_a     6.9325(3)
_cell_length_b     24.5997(13)
_cell_length_c     7.6136(4)
_cell_angle_alpha     90
_cell_angle_beta     111.709(3)
_cell_angle_gamma     90
_cell_volume     1206.31(10)
_cell_formula_units_Z     4
_cell_measurement_reflns_used     11372
_cell_measurement_theta_min     2.9
_cell_measurement_theta_max     27.5
_cell_measurement_temperature     120(2)
_exptl_crystal_description     plate
_exptl_crystal_colour     colourless
_exptl_crystal_size_max     0.26
_exptl_crystal_size_mid     0.08
_exptl_crystal_size_min     0.015
_exptl_crystal_density_diffrn     1.625
_exptl_crystal_density_meas     ?
_exptl_crystal_density_method     'not measured'
_exptl_crystal_F_000     600
_exptl_absorpt_coefficient_mu     0.534
_exptl_absorpt_correction_type     multi-scan
_exptl_absorpt_process_details     '(SADABS; Sheldrick, 2007)'
_exptl_absorpt_correction_T_min     0.760
_exptl_absorpt_correction_T_max     1.000
_exptl_special_details
;
;
_diffrn_ambient_temperature     120(2)
_diffrn_radiation_type     MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_radiation_source     'Enraf Nonius FR591 rotating anode'
_diffrn_radiation_monochromator     '10 cm confocal mirrors'
_diffrn_measurement_device_type     'Enraf--Nonius KappaCCD area-detector'
_diffrn_measurement_method     'φ and ω scans'
_diffrn_detector_area_resol_mean     9.091
_diffrn_reflns_number     8211
_diffrn_reflns_av_R_equivalents     0.052
_diffrn_reflns_av_sigmaI/netI     0.048
_diffrn_reflns_theta_min     3.0
_diffrn_reflns_theta_max     25.0
_diffrn_reflns_theta_full     25.0
_diffrn_measured_fraction_theta_max     0.993
_diffrn_measured_fraction_theta_full     0.993
_diffrn_reflns_limit_h_min     -8
_diffrn_reflns_limit_h_max     8
_diffrn_reflns_limit_k_min     -29
_diffrn_reflns_limit_k_max     29
_diffrn_reflns_limit_l_min     -9
_diffrn_reflns_limit_l_max     8
_diffrn_standards_number     0
_diffrn_standards_interval_count     ?
_diffrn_standards_interval_time     ?
_diffrn_standards_decay_%     0
_refine_special_details
;
Refinement of F² against ALL reflections. The weighted R-factor
wR and goodness of fit S are based on F², conventional
R-factors R are based on F, with F set to zero for
negative F². The threshold expression of F² >
2σ(F²) is used only for calculating R-factors(gt) etc.
and is not relevant to the choice of reflections for refinement.
R-factors based on F² are statistically about twice as large
as those based on F, and R- factors based on ALL data will be
even larger.
;
_reflns_number_total     2108
_reflns_number_gt     1858
_reflns_threshold_expression     I>2σ(I)
_refine_ls_structure_factor_coef     Fsqd
_refine_ls_matrix_type     full
_refine_ls_R_factor_all     0.062
_refine_ls_R_factor_gt     0.052
_refine_ls_wR_factor_gt     0.106
_refine_ls_wR_factor_ref     0.112
_refine_ls_goodness_of_fit_ref     1.14
_refine_ls_restrained_S_all     1.14
_refine_ls_number_reflns     2108
_refine_ls_number_parameters     172
_refine_ls_number_restraints     0
_refine_ls_hydrogen_treatment     constr
_refine_ls_weighting_scheme     calc
_refine_ls_weighting_details
         'calc w=1/[σ²(Fo²)+(0.0128P)²+2.8931P] where P=(Fo²+2Fc²)/3'
_atom_sites_solution_hydrogens     geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary     difmap
_refine_ls_shift/su_max     ?
_refine_ls_shift/su_max_lt     0.001
_refine_ls_shift/su_mean     0.000
_refine_diff_density_max     0.40
_refine_diff_density_min     -0.34
_refine_ls_extinction_method     none
_refine_ls_extinction_coef     ?
loop_
    _atom_type_symbol
    _atom_type_description
    _atom_type_scat_dispersion_real
    _atom_type_scat_dispersion_imag
    _atom_type_scat_source
    'C' 'C' 0.0033 0.0016
                         'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
    'H' 'H' 0.0000 0.0000
                         'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
    'Cl' 'Cl' 0.1484 0.1585
                         'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
    'N' 'N' 0.0061 0.0033
                         'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
    'O' 'O' 0.0106 0.0060
                         'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
_computing_data_collection     'COLLECT (Hooft, 1998)'
_computing_cell_refinement
                    'DENZO (Otwinowski & Minor, 1997) and COLLECT (Hooft, 1998)'
_computing_data_reduction
                    'DENZO (Otwinowski & Minor, 1997) and COLLECT (Hooft, 1998)'
_computing_structure_solution     'SHELXS97 (Sheldrick, 2008)'
_computing_structure_refinement     'SHELXL97 (Sheldrick, 2008)'
_computing_molecular_graphics
                      'ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 2006)'
_computing_publication_material     'publCIF (Westrip, 2009)'
loop_
    _atom_site_type_symbol
    _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_calc_flag
    _atom_site_refinement_flags
    _atom_site_occupancy
    _atom_site_disorder_assembly
    _atom_site_disorder_group
    Cl Cl1 0.21383(14) 0.04241(3) -0.00147(12) 0.0280(2) Uani d . 1 . .
    Cl Cl2 0.35539(13) 0.19347(3) 0.56395(11) 0.0216(2) Uani d . 1 . .
    O O1 0.4468(3) 0.31301(9) 0.2140(3) 0.0211(5) Uani d . 1 . .
    N N1 0.2594(4) 0.41462(11) -0.2597(4) 0.0229(6) Uani d . 1 . .
    N N2 0.2914(4) 0.30126(11) -0.2806(4) 0.0174(6) Uani d . 1 . .
    N N3 0.2987(4) 0.24065(10) 0.0247(4) 0.0169(6) Uani d . 1 . .
    H H3N 0.2381 0.2284 -0.0915 0.020 Uiso calc R 1 . .
    N N4 0.3326(4) 0.20678(11) 0.1769(4) 0.0177(6) Uani d . 1 . .
    C C1 0.3138(4) 0.32651(13) -0.1186(4) 0.0157(7) Uani d . 1 . .
    C C2 0.2997(5) 0.38272(13) -0.1084(5) 0.0195(7) Uani d . 1 . .
    H H2 0.3195 0.3990 0.0102 0.023 Uiso calc R 1 . .
    C C3 0.2393(5) 0.38910(14) -0.4200(5) 0.0216(7) Uani d . 1 . .
    H H3 0.2127 0.4101 -0.5312 0.026 Uiso calc R 1 . .
    C C4 0.2556(5) 0.33325(13) -0.4310(4) 0.0202(7) Uani d . 1 . .
    H H4 0.2409 0.3172 -0.5488 0.024 Uiso calc R 1 . .
    C C5 0.3600(5) 0.29311(12) 0.0566(4) 0.0150(6) Uani d . 1 . .
    C C6 0.2611(5) 0.15869(13) 0.1347(4) 0.0171(7) Uani d . 1 . .
    H H6 0.1945 0.1492 0.0053 0.020 Uiso calc R 1 . .
    C C7 0.2784(5) 0.11748(13) 0.2801(4) 0.0170(7) Uani d . 1 . .
    C C8 0.2472(5) 0.06223(14) 0.2280(4) 0.0191(7) Uani d . 1 . .
    C C9 0.2446(5) 0.02134(14) 0.3508(5) 0.0231(7) Uani d . 1 . .
    H H9 0.2212 -0.0153 0.3084 0.028 Uiso calc R 1 . .
    C C10 0.2764(5) 0.03408(14) 0.5368(5) 0.0243(8) Uani d . 1 . .
    H H10 0.2743 0.0063 0.6227 0.029 Uiso calc R 1 . .
    C C11 0.3110(5) 0.08741(13) 0.5960(5) 0.0198(7) Uani d . 1 . .
    H H11 0.3330 0.0963 0.7234 0.024 Uiso calc R 1 . .
    C C12 0.3142(5) 0.12832(13) 0.4710(5) 0.0184(7) Uani d . 1 . .
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
    Cl1 0.0433(5) 0.0230(5) 0.0214(5) -0.0088(4) 0.0162(4) -0.0058(3)
    Cl2 0.0286(5) 0.0192(4) 0.0173(4) -0.0039(3) 0.0090(3) -0.0028(3)
    O1 0.0247(12) 0.0195(12) 0.0159(12) -0.0036(10) 0.0038(10) -0.0034(9)
    N1 0.0225(15) 0.0208(15) 0.0239(15) -0.0005(12) 0.0067(12) 0.0021(12)
    N2 0.0185(14) 0.0170(14) 0.0149(13) -0.0019(11) 0.0042(11) -0.0015(11)
    N3 0.0214(14) 0.0165(14) 0.0110(13) -0.0020(11) 0.0036(11) 0.0011(10)
    N4 0.0210(14) 0.0170(14) 0.0150(14) 0.0006(11) 0.0066(12) 0.0035(11)
    C1 0.0103(15) 0.0203(17) 0.0128(16) -0.0043(13) -0.0002(12) -0.0008(12)
    C2 0.0185(16) 0.0174(16) 0.0199(17) 0.0018(13) 0.0038(14) 0.0000(13)
    C3 0.0198(17) 0.0225(18) 0.0193(17) -0.0004(14) 0.0036(14) 0.0046(14)
    C4 0.0231(17) 0.0234(18) 0.0149(16) -0.0020(14) 0.0081(14) -0.0027(13)
    C5 0.0150(15) 0.0174(16) 0.0120(15) 0.0017(13) 0.0044(13) 0.0008(12)
    C6 0.0174(16) 0.0203(17) 0.0106(15) 0.0001(13) 0.0018(13) 0.0020(13)
    C7 0.0133(15) 0.0187(16) 0.0188(16) 0.0006(13) 0.0056(13) 0.0026(13)
    C8 0.0196(17) 0.0232(17) 0.0161(17) -0.0002(14) 0.0084(14) 0.0017(13)
    C9 0.0242(18) 0.0173(17) 0.0285(19) 0.0007(14) 0.0105(15) 0.0000(14)
    C10 0.0274(18) 0.0228(19) 0.0230(18) 0.0030(15) 0.0098(15) 0.0081(14)
    C11 0.0199(17) 0.0233(18) 0.0174(16) 0.0016(14) 0.0084(14) 0.0042(13)
    C12 0.0154(15) 0.0182(17) 0.0211(17) -0.0012(13) 0.0060(14) -0.0013(13)
_geom_special_details
;
All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are
estimated using the full covariance matrix. The cell s.u.'s are taken into
account individually in the estimation of s.u.'s in distances, angles and
torsion angles; correlations between s.u.'s in cell parameters are only used
when they are defined by crystal symmetry. An approximate (isotropic)
treatment of cell s.u.'s is used for estimating s.u.'s involving l.s. planes.
;
loop_
    _geom_bond_atom_site_label_1
    _geom_bond_atom_site_label_2
    _geom_bond_site_symmetry_2
    _geom_bond_distance
    _geom_bond_publ_flag
    Cl1 C8 . 1.745(3) ?
    Cl2 C12 . 1.732(3) ?
    O1 C5 . 1.227(4) ?
    N1 C3 . 1.333(4) ?
    N1 C2 . 1.335(4) ?
    N2 C4 . 1.335(4) ?
    N2 C1 . 1.338(4) ?
    N3 C5 . 1.352(4) ?
    N3 N4 . 1.375(3) ?
    N3 H3N . 0.8800 ?
    N4 C6 . 1.277(4) ?
    C1 C2 . 1.390(4) ?
    C1 C5 . 1.497(4) ?
    C2 H2 . 0.9500 ?
    C3 C4 . 1.384(5) ?
    C3 H3 . 0.9500 ?
    C4 H4 . 0.9500 ?
    C6 C7 . 1.473(4) ?
    C6 H6 . 0.9500 ?
    C7 C12 . 1.407(4) ?
    C7 C8 . 1.410(5) ?
    C8 C9 . 1.378(5) ?
    C9 C10 . 1.386(5) ?
    C9 H9 . 0.9500 ?
    C10 C11 . 1.379(5) ?
    C10 H10 . 0.9500 ?
    C11 C12 . 1.391(4) ?
    C11 H11 . 0.9500 ?
loop_
    _geom_angle_atom_site_label_1
    _geom_angle_atom_site_label_2
    _geom_angle_atom_site_label_3
    _geom_angle_site_symmetry_1
    _geom_angle_site_symmetry_3
    _geom_angle
    _geom_angle_publ_flag
    C3 N1 C2 . . 115.5(3) ?
    C4 N2 C1 . . 116.0(3) ?
    C5 N3 N4 . . 118.8(3) ?
    C5 N3 H3N . . 120.6 ?
    N4 N3 H3N . . 120.6 ?
    C6 N4 N3 . . 114.8(3) ?
    N2 C1 C2 . . 121.8(3) ?
    N2 C1 C5 . . 118.7(3) ?
    C2 C1 C5 . . 119.5(3) ?
    N1 C2 C1 . . 122.2(3) ?
    N1 C2 H2 . . 118.9 ?
    C1 C2 H2 . . 118.9 ?
    N1 C3 C4 . . 122.7(3) ?
    N1 C3 H3 . . 118.7 ?
    C4 C3 H3 . . 118.7 ?
    N2 C4 C3 . . 121.8(3) ?
    N2 C4 H4 . . 119.1 ?
    C3 C4 H4 . . 119.1 ?
    O1 C5 N3 . . 124.4(3) ?
    O1 C5 C1 . . 121.2(3) ?
    N3 C5 C1 . . 114.5(3) ?
    N4 C6 C7 . . 122.2(3) ?
    N4 C6 H6 . . 118.9 ?
    C7 C6 H6 . . 118.9 ?
    C12 C7 C8 . . 115.0(3) ?
    C12 C7 C6 . . 125.5(3) ?
    C8 C7 C6 . . 119.4(3) ?
    C9 C8 C7 . . 123.5(3) ?
    C9 C8 Cl1 . . 116.4(3) ?
    C7 C8 Cl1 . . 120.0(2) ?
    C8 C9 C10 . . 119.4(3) ?
    C8 C9 H9 . . 120.3 ?
    C10 C9 H9 . . 120.3 ?
    C11 C10 C9 . . 119.5(3) ?
    C11 C10 H10 . . 120.3 ?
    C9 C10 H10 . . 120.3 ?
    C10 C11 C12 . . 120.6(3) ?
    C10 C11 H11 . . 119.7 ?
    C12 C11 H11 . . 119.7 ?
    C11 C12 C7 . . 121.9(3) ?
    C11 C12 Cl2 . . 115.6(2) ?
    C7 C12 Cl2 . . 122.5(2) ?
loop_
    _geom_torsion_atom_site_label_1
    _geom_torsion_atom_site_label_2
    _geom_torsion_atom_site_label_3
    _geom_torsion_atom_site_label_4
    _geom_torsion_site_symmetry_1
    _geom_torsion_site_symmetry_2
    _geom_torsion_site_symmetry_3
    _geom_torsion_site_symmetry_4
    _geom_torsion
    _geom_torsion_publ_flag
    C5 N3 N4 C6 . . . . 176.7(3) ?
    C4 N2 C1 C2 . . . . 0.2(4) ?
    C4 N2 C1 C5 . . . . -178.4(3) ?
    C3 N1 C2 C1 . . . . -1.8(5) ?
    N2 C1 C2 N1 . . . . 1.3(5) ?
    C5 C1 C2 N1 . . . . 179.9(3) ?
    C2 N1 C3 C4 . . . . 1.0(5) ?
    C1 N2 C4 C3 . . . . -1.1(4) ?
    N1 C3 C4 N2 . . . . 0.5(5) ?
    N4 N3 C5 O1 . . . . 0.7(5) ?
    N4 N3 C5 C1 . . . . -179.4(3) ?
    N2 C1 C5 O1 . . . . 155.9(3) ?
    C2 C1 C5 O1 . . . . -22.7(4) ?
    N2 C1 C5 N3 . . . . -24.0(4) ?
    C2 C1 C5 N3 . . . . 157.4(3) ?
    N3 N4 C6 C7 . . . . -178.3(3) ?
    N4 C6 C7 C12 . . . . 19.9(5) ?
    N4 C6 C7 C8 . . . . -163.6(3) ?
    C12 C7 C8 C9 . . . . 2.0(5) ?
    C6 C7 C8 C9 . . . . -174.9(3) ?
    C12 C7 C8 Cl1 . . . . -176.8(2) ?
    C6 C7 C8 Cl1 . . . . 6.3(4) ?
    C7 C8 C9 C10 . . . . -0.8(5) ?
    Cl1 C8 C9 C10 . . . . 178.1(3) ?
    C8 C9 C10 C11 . . . . -0.3(5) ?
    C9 C10 C11 C12 . . . . 0.0(5) ?
    C10 C11 C12 C7 . . . . 1.3(5) ?
    C10 C11 C12 Cl2 . . . . 179.0(3) ?
    C8 C7 C12 C11 . . . . -2.2(4) ?
    C6 C7 C12 C11 . . . . 174.4(3) ?
    C8 C7 C12 Cl2 . . . . -179.8(2) ?
    C6 C7 C12 Cl2 . . . . -3.1(5) ?
loop_
    _geom_hbond_atom_site_label_D
    _geom_hbond_atom_site_label_H
    _geom_hbond_atom_site_label_A
    _geom_hbond_site_symmetry_A
    _geom_hbond_distance_DH
    _geom_hbond_distance_HA
    _geom_hbond_distance_DA
    _geom_hbond_angle_DHA
    N3 H3n O1 2_454 0.88 2.26 3.003(3) 142
    N3 H3n N2 . 0.88 2.41 2.746(4) 103
    C6 H6 O1 2_454 0.95 2.43 3.214(4) 140
    C10 H10 N1 4_656 0.95 2.53 3.448(4) 162
