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_7233795
_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-nitropyridineN-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                   21.148(5)
_cell_length_b                   6.121(5)
_cell_length_c                   5.1082(12)
_cell_measurement_pressure       340000
_cell_measurement_temperature    296(2)
_cell_volume                     661.2(6)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.274
_diffrn_measured_fraction_theta_max 0.274
_diffrn_measurement_device_type  'Oxford Diffraction Xcalibur Eos'
_diffrn_measurement_method
;HP omega scans - for more details see:
A. Budzianowski, A. Katrusiak in High-Pressure Crystallography
(Eds.: A. Katrusiak, P. F. McMillan),
Dordrecht: Kluwer Acad. Publ., 2004 pp.157-168
;
_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  0.0715
_diffrn_reflns_av_sigmaI/netI    0.0405
_diffrn_reflns_limit_h_max       26
_diffrn_reflns_limit_h_min       -26
_diffrn_reflns_limit_k_max       1
_diffrn_reflns_limit_k_min       -1
_diffrn_reflns_limit_l_max       6
_diffrn_reflns_limit_l_min       -6
_diffrn_reflns_number            2514
_diffrn_reflns_theta_full        27.16
_diffrn_reflns_theta_max         27.16
_diffrn_reflns_theta_min         3.85
_exptl_absorpt_coefficient_mu    0.127
_exptl_absorpt_correction_T_max  0.9283
_exptl_absorpt_correction_T_min  0.5709
_exptl_absorpt_correction_type   analytical
_exptl_absorpt_process_details
;
Katrusiak, A. (2003). REDSHABS - Program for correcting
reflections intensities for DAC absorption, gasket shadowing
and sample crystal absorption. Adam Mickiewicz University, Pozna\'n.
Katrusiak, A. (2004). Z. Kristallogr. 219, 461-467
;
_exptl_crystal_colour            'light yellow'
_exptl_crystal_density_diffrn    1.548
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             320
_exptl_crystal_size_max          0.37
_exptl_crystal_size_mid          0.28
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.080
_refine_diff_density_min         -0.064
_refine_diff_density_rms         0.019
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   4(7)
_refine_ls_extinction_coef       0.072(14)
_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   1.203
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     101
_refine_ls_number_reflns         349
_refine_ls_number_restraints     78
_refine_ls_restrained_S_all      1.118
_refine_ls_R_factor_all          0.0697
_refine_ls_R_factor_gt           0.0512
_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^)+(0.0437P)^2^+0.1778P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1003
_refine_ls_wR_factor_ref         0.1104
_reflns_number_gt                282
_reflns_number_total             349
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            1000008.cif
_cod_data_source_block           PCOD1000008
_cod_depositor_comments
;
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_cell_volume        661.3(6)
_cod_original_sg_symbol_Hall     'P 2ac 2ab '
_cod_original_sg_symbol_H-M      ' P 21 21 21'
_cod_database_code               7233795