Sampling rifamycin conformational variety by cruising through crystal forms: implications for polymorph screening and for biological models
Bacchi, Alessia; Carcelli, Mauro; Pelizzi, Giancarlo; New Journal of Chemistry 32 (2008) 1725–; doi:10.1039/b804746d

data_7051978
_publ_section_title
;
 Sampling rifamycin conformational variety by cruising through crystal
 forms: implications for polymorph screening and for biological models
;
_journal_issue                   10
_journal_name_full               'New Journal of Chemistry'
_journal_page_first              1725
_journal_paper_doi               10.1039/b804746d
_journal_volume                  32
_journal_year                    2008
_chemical_formula_sum            'C38 H50 Cl3 N O14'
_chemical_formula_weight         851.14
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 112.34(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   11.764(5)
_cell_length_b                   15.876(5)
_cell_length_c                   12.222(5)
_cell_measurement_reflns_used    22
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      17
_cell_measurement_theta_min      4
_cell_volume                     2111.3(16)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR97 (Altomare et al. 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.981
_diffrn_measured_fraction_theta_max 0.981
_diffrn_measurement_device_type  diffractometer
_diffrn_measurement_method       '\w/2\q scan'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0324
_diffrn_reflns_av_sigmaI/netI    0.0368
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            4364
_diffrn_reflns_theta_full        71.22
_diffrn_reflns_theta_max         71.22
_diffrn_reflns_theta_min         3.91
_diffrn_standards_interval_count 100
_diffrn_standards_number         1
_exptl_absorpt_coefficient_mu    2.520
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.339
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             896
_exptl_crystal_size_max          0.08
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.329
_refine_diff_density_min         -0.501
_refine_diff_density_rms         0.083
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.03(4)
_refine_ls_extinction_coef       0.0085(13)
_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   0.917
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     542
_refine_ls_number_reflns         4348
_refine_ls_number_restraints     9
_refine_ls_restrained_S_all      0.917
_refine_ls_R_factor_all          0.1252
_refine_ls_R_factor_gt           0.0760
_refine_ls_shift/su_max          0.007
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1900P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1890
_refine_ls_wR_factor_ref         0.2529
_reflns_number_gt                2115
_reflns_number_total             4348
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b804746d.txt
_cod_data_source_block           RSII
_cod_original_cell_volume        2111.3(1)
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               7051978