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###        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      #
# for Authors for Section E, and has been peer reviewed under the auspices   #
# of the IUCr Commission on Journals.                                        #
#                                                                            #
# Full details of the Crystallographic Information File format               #
# are given in the paper "The Crystallographic Information File (CIF):       #
# a New Standard Archive File for Crystallography" by S. R. Hall, F. H.      #
# Allen and I. D. Brown [Acta Cryst. (1991), A47, 655-685].                  #
#                                                                            #
# The current version of the core CIF dictionary is obtainable from          #
# ftp://ftp.iucr.org/pub/cif_core.dic. The current version number is 2.1.    #
#                                                                            #
# Software is freely available for graphical display of the structure(s) in  #
# this CIF.  For information consult the CIF home page http://www.iucr.org/  #
# cif/home.html                                                              #
#                                                                            #
#            Copyright International Union of Crystallography                #
#                                                                            #
##############################################################################
                                             
data_I
_audit_creation_method     SHELXL-97
_chemical_name_systematic
;
3-Amino-6-chloropyridazine
;
_chemical_name_common     ?
_chemical_formula_moiety     'C4 H4 Cl N3'
_chemical_formula_sum     'C4 H4 Cl N3'
_chemical_formula_iupac     'C4 H4 Cl N3'
_chemical_formula_weight     129.55
_chemical_melting_point     ?
_symmetry_cell_setting     Monoclinic
_symmetry_space_group_name_H-M     'P 21/c'
_symmetry_space_group_name_Hall     '-P 2ybc'
loop_
    _symmetry_equiv_pos_as_xyz
    'x, y, z'
    '-x, y+1/2, -z+1/2'
    '-x, -y, -z'
    'x, -y-1/2, z-1/2'
_cell_length_a     7.5235(14)
_cell_length_b     6.5887(11)
_cell_length_c     11.1748(19)
_cell_angle_alpha     90.00
_cell_angle_beta     105.045(10)
_cell_angle_gamma     90.00
_cell_volume     534.95(16)
_cell_formula_units_Z     4
_cell_measurement_reflns_used     1227
_cell_measurement_theta_min     2.8
_cell_measurement_theta_max     27.6
_cell_measurement_temperature     125(2)
_exptl_crystal_description     Block
_exptl_crystal_colour     colourless
_exptl_crystal_size_max     0.50
_exptl_crystal_size_mid     0.50
_exptl_crystal_size_min     0.40
_exptl_crystal_density_diffrn     1.609
_exptl_crystal_density_meas     ?
_exptl_crystal_density_method     'not measured'
_exptl_crystal_F_000     264
_exptl_absorpt_coefficient_mu     0.587
_exptl_absorpt_correction_type     multi-scan
_exptl_absorpt_process_details     '(SADABS; Bruker, 2002)'
_exptl_absorpt_correction_T_min     0.756
_exptl_absorpt_correction_T_max     0.794
_exptl_special_details
;
;
_diffrn_ambient_temperature     125(2)
_diffrn_radiation_type     MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_radiation_source     'fine-focus sealed tube'
_diffrn_radiation_monochromator     graphite
_diffrn_measurement_device_type     'Bruker SMART CCD area-detector'
_diffrn_measurement_method     'φ and ω'
_diffrn_detector_area_resol_mean     ?
_diffrn_reflns_number     5258
_diffrn_reflns_av_R_equivalents     0.0149
_diffrn_reflns_av_sigmaI/netI     0.0126
_diffrn_reflns_theta_min     2.80
_diffrn_reflns_theta_max     27.60
_diffrn_reflns_theta_full     27.60
_diffrn_measured_fraction_theta_max     0.990
_diffrn_measured_fraction_theta_full     0.990
_diffrn_reflns_limit_h_min     -8
_diffrn_reflns_limit_h_max     9
_diffrn_reflns_limit_k_min     -8
_diffrn_reflns_limit_k_max     8
_diffrn_reflns_limit_l_min     -14
_diffrn_reflns_limit_l_max     12
_diffrn_standards_number     0
_diffrn_standards_interval_count     .
_diffrn_standards_interval_time     .
_diffrn_standards_decay_%     ?
_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 > 2sigma(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     1227
_reflns_number_gt     1153
_reflns_threshold_expression     I>2σ(I)
_refine_ls_structure_factor_coef     Fsqd
_refine_ls_matrix_type     full
_refine_ls_R_factor_all     0.0349
_refine_ls_R_factor_gt     0.0331
_refine_ls_wR_factor_gt     0.0867
_refine_ls_wR_factor_ref     0.0884
_refine_ls_goodness_of_fit_ref     1.117
_refine_ls_restrained_S_all     1.117
_refine_ls_number_reflns     1227
_refine_ls_number_parameters     73
_refine_ls_number_restraints     0
_refine_ls_hydrogen_treatment     constr
_refine_ls_weighting_scheme     calc
_refine_ls_weighting_details
           'calc w=1/[σ²(Fo²)+(0.047P)²+0.167P] 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     0.001
_refine_ls_shift/su_mean     0.000
_refine_diff_density_max     0.245
_refine_diff_density_min     -0.347
_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'
    'N' 'N' 0.0061 0.0033
                         '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'
_computing_data_collection     'SMART (Bruker, 2002)'
_computing_cell_refinement     'SAINT (Bruker, 2002)'
_computing_data_reduction     'SAINT'
_computing_structure_solution     'SHELXS97 (Sheldrick, 1997)'
_computing_structure_refinement     'SHELXL97 (Sheldrick, 1997)'
_computing_molecular_graphics     'SHELXTL (Bruker, 2002)'
_computing_publication_material     'SHELXTL'
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 0.34908(6) 0.22748(6) 0.47446(3) 0.04506(16) Uani d . 1 . .
    N N1 0.19326(16) 0.58112(18) 0.46416(10) 0.0322(3) Uani d . 1 . .
    C C4 0.17199(19) 0.7781(2) 0.63301(12) 0.0303(3) Uani d . 1 . .
    N N3 0.11738(19) 0.9525(2) 0.67524(11) 0.0439(3) Uani d . 1 . .
    H H3A 0.0622 1.0436 0.6238 0.053 Uiso calc R 1 . .
    H H3B 0.1377 0.9727 0.7537 0.053 Uiso calc R 1 . .
    C C2 0.3197(2) 0.4557(2) 0.67021(12) 0.0353(3) Uani d . 1 . .
    H H2 0.3804 0.3520 0.7212 0.042 Uiso calc R 1 . .
    C C3 0.26466(19) 0.6271(2) 0.71699(11) 0.0341(3) Uani d . 1 . .
    H H3 0.2870 0.6455 0.8021 0.041 Uiso calc R 1 . .
    C C1 0.28026(18) 0.4428(2) 0.54031(12) 0.0301(3) Uani d . 1 . .
    N N2 0.13712(17) 0.75340(18) 0.50956(11) 0.0330(3) 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 0.0612(3) 0.0370(2) 0.0391(2) 0.00197(15) 0.01685(18) -0.00858(13)
    N1 0.0413(6) 0.0333(6) 0.0217(5) -0.0046(5) 0.0078(4) -0.0009(4)
    C4 0.0343(6) 0.0328(7) 0.0236(6) -0.0024(5) 0.0068(5) 0.0002(5)
    N3 0.0626(8) 0.0405(7) 0.0262(6) 0.0139(6) 0.0073(5) -0.0010(5)
    C2 0.0442(7) 0.0359(7) 0.0244(6) 0.0042(6) 0.0064(5) 0.0048(5)
    C3 0.0428(7) 0.0395(7) 0.0187(5) 0.0015(6) 0.0056(5) 0.0018(5)
    C1 0.0360(6) 0.0301(6) 0.0251(6) -0.0046(5) 0.0097(5) -0.0026(5)
    N2 0.0429(6) 0.0327(6) 0.0218(5) 0.0001(4) 0.0057(5) 0.0023(4)
_geom_special_details
;
 All esds (except the esd in the dihedral angle between two l.s. planes)
 are estimated using the full covariance matrix.  The cell esds are taken
 into account individually in the estimation of esds in distances, angles
 and torsion angles; correlations between esds in cell parameters are only
 used when they are defined by crystal symmetry.  An approximate (isotropic)
 treatment of cell esds is used for estimating esds 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 C1 . 1.7378(14) ?
    N1 C1 . 1.3015(18) ?
    N1 N2 . 1.3548(17) ?
    C4 N2 . 1.3456(17) ?
    C4 N3 . 1.3460(18) ?
    C4 C3 . 1.4204(19) ?
    N3 H3A . 0.86 ?
    N3 H3B . 0.86 ?
    C2 C3 . 1.354(2) ?
    C2 C1 . 1.4067(18) ?
    C2 H2 . 0.93 ?
    C3 H3 . 0.93 ?
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
    C1 N1 N2 . . 119.64(11) ?
    N2 C4 N3 . . 117.82(12) ?
    N2 C4 C3 . . 121.61(12) ?
    N3 C4 C3 . . 120.57(12) ?
    C4 N3 H3A . . 120.0 ?
    C4 N3 H3B . . 120.0 ?
    H3A N3 H3B . . 120.0 ?
    C3 C2 C1 . . 116.44(12) ?
    C3 C2 H2 . . 121.8 ?
    C1 C2 H2 . . 121.8 ?
    C2 C3 C4 . . 118.44(12) ?
    C2 C3 H3 . . 120.8 ?
    C4 C3 H3 . . 120.8 ?
    N1 C1 C2 . . 124.61(13) ?
    N1 C1 Cl1 . . 116.70(10) ?
    C2 C1 Cl1 . . 118.69(11) ?
    C4 N2 N1 . . 119.25(11) ?
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
    C1 C2 C3 C4 . . . . 0.3(2) ?
    N2 C4 C3 C2 . . . . 0.6(2) ?
    N3 C4 C3 C2 . . . . -178.90(14) ?
    N2 N1 C1 C2 . . . . 1.2(2) ?
    N2 N1 C1 Cl1 . . . . -179.49(9) ?
    C3 C2 C1 N1 . . . . -1.2(2) ?
    C3 C2 C1 Cl1 . . . . 179.46(11) ?
    N3 C4 N2 N1 . . . . 178.83(12) ?
    C3 C4 N2 N1 . . . . -0.6(2) ?
    C1 N1 N2 C4 . . . . -0.20(19) ?
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
    _geom_hbond_publ_flag
    N3 H3A N2 3_576 0.86 2.26 3.1038(18) 168 yes
    N3 H3B N1 4_576 0.86 2.31 3.1372(17) 162 yes
data_global
_journal_data_validation_number     ?
_journal_date_recd_electronic     2007-08-29
_journal_date_accepted     2007-08-30
_journal_name_full     'Acta Crystallographica, Section E'
_journal_year     2007
_journal_volume     63
_journal_issue     10
_journal_page_first     o3962
_journal_page_last     o3962
_journal_paper_category     QO
_journal_coeditor_code     CI2455
_publ_contact_author_name     'Bo Gao'
_publ_contact_author_address
;
    Marine College
    Zhejiang Institute of Communications
    Hangzhou 311112
    People's Republic of China
;
_publ_contact_author_email     bgao_zjvtit@126.com
_publ_contact_author_fax     '++86-571-88481900'
_publ_contact_author_phone     '++86-571-88481680'
_publ_section_title
;
3-Amino-6-chloropyridazine at 125 K
;
loop_
    _publ_author_name
    _publ_author_address
    'Bo Gao'
;
    Marine College
    Zhejiang Institute of Communications
    Hangzhou 311112
    People's Republic of China
;
