Anomalous compression of a weakly CH...O bonded nonlinear optical molecular crystal
Weizhao Cai; Jiangang He; Wei Li; Andrzej Katrusiak; Journal of Materials Chemistry C 2 (2014) 6471–6476; doi:10.1039/C4TC00654B

data_7233808
_publ_section_title
;
 Anomalous compression of a weakly CH...O bonded nonlinear optical
 molecular crystal
;
_journal_name_full               'Journal of Materials Chemistry C'
_journal_page_first              6471
_journal_page_last               6476
_journal_paper_doi               10.1039/C4TC00654B
_journal_volume                  2
_journal_year                    2014
_chemical_formula_moiety         'C6 H6 N2 O3'
_chemical_formula_sum            'C6 H6 N2 O3'
_chemical_formula_weight         154.13
_chemical_name_common            3-methyl-4-nitropyridine-N-oxide
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   21.2997(10)
_cell_length_b                   6.1229(3)
_cell_length_c                   5.1413(3)
_cell_measurement_reflns_used    1885
_cell_measurement_temperature    255(2)
_cell_measurement_theta_max      28.70
_cell_measurement_theta_min      3.46
_cell_volume                     670.51(6)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      255(2)
_diffrn_measured_fraction_theta_full 0.907
_diffrn_measured_fraction_theta_max 0.907
_diffrn_measurement_device_type  'Oxford Diffraction Xcalibur Eos'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0116
_diffrn_reflns_av_sigmaI/netI    0.0169
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -27
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       3
_diffrn_reflns_limit_l_min       -6
_diffrn_reflns_number            1885
_diffrn_reflns_theta_full        28.70
_diffrn_reflns_theta_max         28.70
_diffrn_reflns_theta_min         3.46
_exptl_absorpt_coefficient_mu    0.125
_exptl_absorpt_correction_T_max  0.9754
_exptl_absorpt_correction_T_min  0.9635
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(CrysAlis Pro; Oxford Diffraction, 2010)'
_exptl_crystal_colour            'light yellow'
_exptl_crystal_density_diffrn    1.527
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             320
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.148
_refine_diff_density_min         -0.135
_refine_diff_density_rms         0.031
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.0(2)
_refine_ls_extinction_coef       0.032(7)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.101
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     102
_refine_ls_number_reflns         946
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.101
_refine_ls_R_factor_all          0.0371
_refine_ls_R_factor_gt           0.0319
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0474P)^2^+0.0533P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0845
_refine_ls_wR_factor_ref         0.0876
_reflns_number_gt                842
_reflns_number_total             946
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            1000021.cif
_cod_data_source_block           PCOD1000021
_cod_depositor_comments
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The following automatic conversions were performed:

data item '_symmetry_cell_setting' value 'Orthorhombic' was changed
to 'orthorhombic' in accordance with the built-in table derived from
the CIF Core dictionary named 'cif_core.dic' version 2.4.5 last
updated on 2014-11-21.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_original_sg_symbol_Hall     'P 2ac 2ab '
_cod_original_sg_symbol_H-M      ' P 21 21 21'
_cod_database_code               7233808