# Electronic Supplementary Material (ESI) for RSC Advances
# This journal is © The Royal Society of Chemistry 2011


data_global
_journal_name_full               'RSC Advances'
_journal_coden_cambridge         1500
_journal_year                    ?
_journal_volume                  ?
_journal_page_first              ?
_publ_contact_author_email       wang_wei@lzu.edu.cn
_publ_contact_author_name        'Wang, Wei'
loop_
_publ_author_name
'Wei Wang'
'Yong Zhang'
'Zhi Jun  Li'
'Hai Sen Xu'
'Yuan Zhang'

data_p21
_database_code_depnum_ccdc_archive 'CCDC 828228'
#TrackingRef '- P21.cif'

_audit_creation_method           SHELXL-97
_chemical_name_systematic        
;
?
;
_chemical_name_common            ?
_chemical_melting_point          ?
_chemical_formula_moiety         ?
_chemical_formula_sum            'C9 H7 Br N2 O4'
_chemical_formula_weight         287.08
_chemical_absolute_configuration none

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'
O O 0.0106 0.0060 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
Br Br -0.2901 2.4595 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'

_symmetry_cell_setting           Monoclinic
_symmetry_space_group_name_H-M   P2(1)

loop_
_symmetry_equiv_pos_as_xyz
'x, y, z'
'-x, y+1/2, -z'

_cell_length_a                   7.437(15)
_cell_length_b                   6.480(13)
_cell_length_c                   10.87(2)
_cell_angle_alpha                90.00
_cell_angle_beta                 90.185(17)
_cell_angle_gamma                90.00
_cell_volume                     523.6(18)
_cell_formula_units_Z            2
_cell_measurement_temperature    296(2)
_cell_measurement_reflns_used    1522
_cell_measurement_theta_min      2.74
_cell_measurement_theta_max      25.85

_exptl_crystal_description       block
_exptl_crystal_colour            colorless
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.21
_exptl_crystal_density_meas      ?
_exptl_crystal_density_diffrn    1.821
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             284
_exptl_absorpt_coefficient_mu    3.926
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_correction_T_min  0.4403
_exptl_absorpt_correction_T_max  0.4928
_exptl_absorpt_process_details   SADABS

_exptl_special_details           
;
?
;

_diffrn_ambient_temperature      296(2)
_diffrn_radiation_wavelength     0.71073
_diffrn_radiation_type           MoK\a
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_monochromator  graphite
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_detector_area_resol_mean ?
_diffrn_reflns_number            3567
_diffrn_reflns_av_R_equivalents  0.0669
_diffrn_reflns_av_sigmaI/netI    0.1077
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_theta_min         2.74
_diffrn_reflns_theta_max         25.50
_reflns_number_total             1895
_reflns_number_gt                1361
_reflns_threshold_expression     >2sigma(I)

_computing_data_collection       'Bruker APEX2'
_computing_cell_refinement       'Bruker SAINT'
_computing_data_reduction        'Bruker SAINT'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'

_refine_special_details          
;
Refinement of F^2^ against ALL reflections. The weighted R-factor wR and
goodness of fit S are based on F^2^, conventional R-factors R are based
on F, with F set to zero for negative F^2^. The threshold expression of
F^2^ > 2sigma(F^2^) is used only for calculating R-factors(gt) etc. and is
not relevant to the choice of reflections for refinement. R-factors based
on F^2^ are statistically about twice as large as those based on F, and R-
factors based on ALL data will be even larger.
;

_refine_ls_structure_factor_coef Fsqd
_refine_ls_matrix_type           full
_refine_ls_weighting_scheme      calc
_refine_ls_weighting_details     
'calc w=1/[\s^2^(Fo^2^)+(0.0418P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_atom_sites_solution_hydrogens   geom
_refine_ls_hydrogen_treatment    constr
_refine_ls_extinction_method     none
_refine_ls_extinction_coef       ?
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.024(19)
_refine_ls_number_reflns         1895
_refine_ls_number_parameters     146
_refine_ls_number_restraints     1
_refine_ls_R_factor_all          0.0776
_refine_ls_R_factor_gt           0.0488
_refine_ls_wR_factor_ref         0.1191
_refine_ls_wR_factor_gt          0.1074
_refine_ls_goodness_of_fit_ref   0.981
_refine_ls_restrained_S_all      0.981
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000

loop_
_atom_site_label
_atom_site_type_symbol
_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
_atom_site_symmetry_multiplicity
_atom_site_calc_flag
_atom_site_refinement_flags
_atom_site_disorder_assembly
_atom_site_disorder_group
Br1 Br 0.36442(9) 0.67559(11) 0.67691(5) 0.0574(3) Uani 1 1 d . . .
C1 C 0.2098(8) 0.6023(9) 0.3166(5) 0.0264(14) Uani 1 1 d . . .
C2 C 0.2800(7) 0.6830(16) 0.4235(4) 0.0315(12) Uani 1 1 d . . .
H2 H 0.3268 0.8160 0.4262 0.038 Uiso 1 1 calc R . .
C3 C 0.2783(9) 0.5585(12) 0.5267(6) 0.0376(17) Uani 1 1 d . . .
C4 C 0.2135(10) 0.3604(12) 0.5241(7) 0.0449(19) Uani 1 1 d . . .
H4 H 0.2174 0.2801 0.5950 0.054 Uiso 1 1 calc R . .
C5 C 0.1419(10) 0.2787(11) 0.4164(6) 0.0407(17) Uani 1 1 d . . .
H5 H 0.0961 0.1452 0.4142 0.049 Uiso 1 1 calc R . .
C6 C 0.1406(8) 0.4017(10) 0.3123(6) 0.0338(16) Uani 1 1 d . . .
C7 C 0.0974(10) 0.5194(11) 0.1162(6) 0.0385(16) Uani 1 1 d . . .
C8 C 0.1835(8) 0.7006(13) 0.1925(5) 0.0313(14) Uani 1 1 d . . .
C9 C 0.3486(10) 0.7839(12) 0.1304(7) 0.0447(18) Uani 1 1 d . . .
H9A H 0.3183 0.8237 0.0468 0.054 Uiso 1 1 calc R . .
H9B H 0.3889 0.9065 0.1737 0.054 Uiso 1 1 calc R . .
N1 N 0.0743(9) 0.3590(9) 0.1941(5) 0.0415(15) Uani 1 1 d . . .
H1 H 0.0247 0.2441 0.1735 0.050 Uiso 1 1 calc R . .
N2 N 0.4988(9) 0.6294(14) 0.1275(5) 0.058(2) Uani 1 1 d . . .
O1 O 0.0571(7) 0.8633(7) 0.2003(4) 0.0414(12) Uani 1 1 d . . .
H1A H 0.0074 0.8785 0.1334 0.062 Uiso 1 1 calc R . .
O2 O 0.0540(7) 0.5372(8) 0.0087(4) 0.0520(14) Uani 1 1 d . . .
O3 O 0.4603(8) 0.4483(12) 0.1103(6) 0.0695(17) Uani 1 1 d . . .
O4 O 0.6534(8) 0.689(2) 0.1417(8) 0.130(3) Uani 1 1 d . . .

loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_23
_atom_site_aniso_U_13
_atom_site_aniso_U_12
Br1 0.0527(5) 0.0865(6) 0.0330(3) 0.0033(5) -0.0070(3) 0.0078(5)
C1 0.019(3) 0.027(3) 0.033(3) 0.002(2) -0.001(2) 0.001(2)
C2 0.027(3) 0.036(3) 0.032(3) 0.005(4) 0.000(2) 0.001(4)
C3 0.030(4) 0.052(5) 0.031(3) 0.006(3) 0.003(3) 0.009(3)
C4 0.038(5) 0.045(5) 0.051(4) 0.021(4) 0.010(3) 0.009(4)
C5 0.036(4) 0.031(3) 0.055(4) 0.006(3) 0.008(3) -0.006(3)
C6 0.026(4) 0.031(4) 0.044(4) 0.002(3) 0.005(3) -0.004(3)
C7 0.038(4) 0.037(4) 0.040(4) -0.007(3) -0.004(3) 0.003(3)
C8 0.033(3) 0.027(4) 0.034(3) -0.006(3) -0.004(2) -0.003(4)
C9 0.049(5) 0.051(4) 0.034(3) 0.000(3) 0.006(3) -0.009(4)
N1 0.043(4) 0.031(4) 0.050(4) -0.007(3) -0.003(3) -0.005(3)
N2 0.047(4) 0.088(8) 0.039(3) -0.005(4) 0.005(3) -0.007(4)
O1 0.052(3) 0.038(3) 0.034(3) -0.006(2) -0.013(2) 0.013(3)
O2 0.067(4) 0.053(3) 0.037(3) -0.015(2) -0.017(2) -0.001(3)
O3 0.055(4) 0.081(5) 0.072(4) -0.010(3) 0.018(3) 0.015(4)
O4 0.042(4) 0.139(7) 0.208(9) -0.010(9) -0.008(4) -0.010(6)

_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_distance
_geom_bond_site_symmetry_2
_geom_bond_publ_flag
Br1 C3 1.909(7) . ?
C1 C2 1.376(9) . ?
C1 C6 1.399(9) . ?
C1 C8 1.503(9) . ?
C2 C3 1.381(10) . ?
C2 H2 0.9300 . ?
C3 C4 1.372(11) . ?
C4 C5 1.389(11) . ?
C4 H4 0.9300 . ?
C5 C6 1.383(10) . ?
C5 H5 0.9300 . ?
C6 N1 1.402(9) . ?
C7 O2 1.216(8) . ?
C7 N1 1.352(9) . ?
C7 C8 1.572(10) . ?
C8 O1 1.415(9) . ?
C8 C9 1.503(9) . ?
C9 N2 1.500(11) . ?
C9 H9A 0.9700 . ?
C9 H9B 0.9700 . ?
N1 H1 0.8600 . ?
N2 O4 1.222(10) . ?
N2 O3 1.222(10) . ?
O1 H1A 0.8200 . ?

loop_
_geom_angle_atom_site_label_1
_geom_angle_atom_site_label_2
_geom_angle_atom_site_label_3
_geom_angle
_geom_angle_site_symmetry_1
_geom_angle_site_symmetry_3
_geom_angle_publ_flag
C2 C1 C6 121.3(6) . . ?
C2 C1 C8 130.2(6) . . ?
C6 C1 C8 108.5(5) . . ?
C1 C2 C3 117.4(8) . . ?
C1 C2 H2 121.3 . . ?
C3 C2 H2 121.3 . . ?
C4 C3 C2 122.3(7) . . ?
C4 C3 Br1 120.5(5) . . ?
C2 C3 Br1 117.3(6) . . ?
C3 C4 C5 120.5(6) . . ?
C3 C4 H4 119.7 . . ?
C5 C4 H4 119.7 . . ?
C6 C5 C4 118.1(6) . . ?
C6 C5 H5 121.0 . . ?
C4 C5 H5 121.0 . . ?
C5 C6 C1 120.5(6) . . ?
C5 C6 N1 129.5(6) . . ?
C1 C6 N1 110.0(6) . . ?
O2 C7 N1 129.8(7) . . ?
O2 C7 C8 122.8(7) . . ?
N1 C7 C8 107.3(6) . . ?
O1 C8 C9 107.6(7) . . ?
O1 C8 C1 110.3(5) . . ?
C9 C8 C1 116.8(5) . . ?
O1 C8 C7 108.6(5) . . ?
C9 C8 C7 111.3(6) . . ?
C1 C8 C7 102.0(6) . . ?
N2 C9 C8 112.3(7) . . ?
N2 C9 H9A 109.2 . . ?
C8 C9 H9A 109.2 . . ?
N2 C9 H9B 109.2 . . ?
C8 C9 H9B 109.2 . . ?
H9A C9 H9B 107.9 . . ?
C7 N1 C6 112.1(6) . . ?
C7 N1 H1 123.9 . . ?
C6 N1 H1 123.9 . . ?
O4 N2 O3 122.8(10) . . ?
O4 N2 C9 119.2(10) . . ?
O3 N2 C9 118.0(7) . . ?
C8 O1 H1A 109.5 . . ?

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
_geom_torsion_site_symmetry_1
_geom_torsion_site_symmetry_2
_geom_torsion_site_symmetry_3
_geom_torsion_site_symmetry_4
_geom_torsion_publ_flag
C6 C1 C2 C3 -0.4(9) . . . . ?
C8 C1 C2 C3 176.4(6) . . . . ?
C1 C2 C3 C4 1.4(10) . . . . ?
C1 C2 C3 Br1 -176.9(5) . . . . ?
C2 C3 C4 C5 -1.7(11) . . . . ?
Br1 C3 C4 C5 176.5(5) . . . . ?
C3 C4 C5 C6 0.9(11) . . . . ?
C4 C5 C6 C1 0.0(10) . . . . ?
C4 C5 C6 N1 -178.7(7) . . . . ?
C2 C1 C6 C5 -0.3(10) . . . . ?
C8 C1 C6 C5 -177.7(6) . . . . ?
C2 C1 C6 N1 178.7(6) . . . . ?
C8 C1 C6 N1 1.3(7) . . . . ?
C2 C1 C8 O1 -64.7(8) . . . . ?
C6 C1 C8 O1 112.5(6) . . . . ?
C2 C1 C8 C9 58.6(10) . . . . ?
C6 C1 C8 C9 -124.3(7) . . . . ?
C2 C1 C8 C7 -179.9(6) . . . . ?
C6 C1 C8 C7 -2.7(7) . . . . ?
O2 C7 C8 O1 63.2(9) . . . . ?
N1 C7 C8 O1 -113.1(6) . . . . ?
O2 C7 C8 C9 -55.1(10) . . . . ?
N1 C7 C8 C9 128.6(7) . . . . ?
O2 C7 C8 C1 179.6(7) . . . . ?
N1 C7 C8 C1 3.3(7) . . . . ?
O1 C8 C9 N2 174.7(5) . . . . ?
C1 C8 C9 N2 50.2(9) . . . . ?
C7 C8 C9 N2 -66.4(8) . . . . ?
O2 C7 N1 C6 -178.7(8) . . . . ?
C8 C7 N1 C6 -2.8(8) . . . . ?
C5 C6 N1 C7 179.9(7) . . . . ?
C1 C6 N1 C7 1.1(8) . . . . ?
C8 C9 N2 O4 -142.5(7) . . . . ?
C8 C9 N2 O3 37.8(9) . . . . ?

_diffrn_measured_fraction_theta_max 0.998
_diffrn_reflns_theta_full        25.50
_diffrn_measured_fraction_theta_full 0.998
_refine_diff_density_max         0.349
_refine_diff_density_min         -0.488
_refine_diff_density_rms         0.094