An excellent fluorescent dye with a twistable aromatic chain and its axially chiral crystals.
Ma, Yan; Hao, Rui; Shao, Guangsheng; Wang, Yuan; The journal of physical chemistry. A 113 (2009) 5066–5072; doi:10.1021/jp900514e

data_1516383
_publ_section_title
;
 An excellent fluorescent dye with a twistable aromatic chain and its
 axially chiral crystals.
;
_journal_issue                   17
_journal_name_full               'The journal of physical chemistry. A'
_journal_page_first              5066
_journal_page_last               5072
_journal_paper_doi               10.1021/jp900514e
_journal_volume                  113
_journal_year                    2009
_chemical_formula_sum            'C19 H18 Cl2 N4'
_chemical_formula_weight         373.27
_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                 93.9836(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   7.6007(2)
_cell_length_b                   7.3647(2)
_cell_length_c                   16.1100(4)
_cell_measurement_reflns_used    10642
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.485
_cell_measurement_theta_min      3.395
_cell_volume                     899.61(4)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor, 1997)'
_computing_data_collection       'KappaCCD (Nonius B. V., 1998)'
_computing_data_reduction
'HKL Denzo (Otwinowski & Minor, 1997) & maXus (Mackay et al., 1998)'
_computing_molecular_graphics    'Bruker SHELXTL V5.1 (Sheldrick, 1998)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'NONIUS KappaCCD'
_diffrn_measurement_method       CCD
_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  0.0416
_diffrn_reflns_av_sigmaI/netI    0.0361
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            14856
_diffrn_reflns_theta_full        27.51
_diffrn_reflns_theta_max         27.51
_diffrn_reflns_theta_min         3.56
_diffrn_standards_decay_%        none
_exptl_absorpt_coefficient_mu    0.370
_exptl_absorpt_correction_T_max  0.978
_exptl_absorpt_correction_T_min  0.873
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
multi-scan from symmetry-related measurements 
 Sortav (Blessing 1995, 1997)
;
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.378
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'thin plate'
_exptl_crystal_F_000             388
_exptl_crystal_size_max          0.53
_exptl_crystal_size_mid          0.45
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.186
_refine_diff_density_min         -0.237
_refine_diff_density_rms         0.035
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.00
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.064
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     226
_refine_ls_number_reflns         4109
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.064
_refine_ls_R_factor_all          0.0504
_refine_ls_R_factor_gt           0.0350
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0521P)^2^+0.0088P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0865
_refine_ls_wR_factor_ref         0.0917
_reflns_number_gt                3237
_reflns_number_total             4109
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jp900514e_si_002.cif
_cod_data_source_block           07sep19c
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/automatic-downloads/retrospective/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 

The following automatic conversions were performed:

'_refine_ls_hydrogen_treatment' value 'constr.' was replaced with the
value 'constr' as specified in the replacement file
'src/cod-tools/trunk/data/replacement-values/replacement_values.lst'.

Automatic conversion script
Id: cif_fix_values 5376 2017-05-30 11:51:03Z andrius 
;
_cod_original_sg_symbol_H-M      'P 2(1)'
_cod_database_code               1516383