A Systematic Study of Thermochromic Aromatic Donor-Acceptor Materials
Paul M. Alvey; Joseph J. Reczek; Vincent Lynch; Brent L. Iverson; Journal of Organic Chemistry 75 (2010) 7682–7690; doi:10.1021/jo101498b

data_4025813
_publ_section_title
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 A Systematic Study of Thermochromic Aromatic Donor-Acceptor Materials
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              7682
_journal_page_last               7690
_journal_paper_doi               10.1021/jo101498b
_journal_volume                  75
_journal_year                    2010
_chemical_formula_sum            'C28 H34 N2 O4'
_chemical_formula_weight         462.57
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           5
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C 2y'
_symmetry_space_group_name_H-M   'C 1 2 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                 90.833(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   41.893(2)
_cell_length_b                   6.8695(3)
_cell_length_c                   8.4203(3)
_cell_measurement_temperature    153(2)
_cell_volume                     2422.97(18)
_computing_cell_refinement       'Collect software, Nonius B.V. 1998'
_computing_data_collection       'Collect software, Nonius B.V. 1998'
_computing_data_reduction
;
DENZO and Scalepack (Otwinoski and Minor, 1997)
;
_computing_molecular_graphics    'XP SHELXTL/PC, Siemens Analytical'
_computing_structure_refinement  'XL SHELXTL/PC, Siemens Analytical'
_computing_structure_solution
;

SIR97 - Altomare A., Burla M.C., Camalli M., Cascarano G.L., Giacovazzo C., 
Guagliardi A., Moliterni A.G.G., Polidori G.,Spagna R.
;
_diffrn_ambient_temperature      153(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_diffrn_measurement_method       \w-scan
_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  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0763
_diffrn_reflns_limit_h_max       53
_diffrn_reflns_limit_h_min       -54
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            5177
_diffrn_reflns_theta_full        27.52
_diffrn_reflns_theta_max         27.52
_diffrn_reflns_theta_min         2.92
_exptl_absorpt_coefficient_mu    0.085
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    1.268
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'thin plates'
_exptl_crystal_F_000             992
_exptl_crystal_size_max          0.46
_exptl_crystal_size_mid          0.33
_exptl_crystal_size_min          0.11
_refine_diff_density_max         0.249
_refine_diff_density_min         -0.231
_refine_diff_density_rms         0.046
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.4(18)
_refine_ls_extinction_coef       0.0042(6)
_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   1.053
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     308
_refine_ls_number_reflns         5177
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.1232
_refine_ls_R_factor_gt           0.0752
_refine_ls_shift/su_max          0.038
_refine_ls_shift/su_mean         0.007
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0292P)^2^+3.8538P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1224
_refine_ls_wR_factor_ref         0.1414
_reflns_number_gt                3490
_reflns_number_total             5177
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo101498b_si_010.cif
_cod_data_source_block           n4
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to the built-in table from CIF Core dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 
;
_cod_database_code               4025813