Solid state double [2 + 2] photochemical reactions in the co-crystal forms of 1,5-bis(4-pyridyl)-1,4-pentadiene-3-one: establishing mechanism using single crystal X-ray, UV and 1H NMR
Santra, Ramkinkar; Biradha, Kumar; CrystEngComm 13 (2011) 3246–; doi:10.1039/c0ce00612b

data_7205674
_publ_section_title
;
 Solid state double [2 + 2] photochemical reactions in the co-crystal
 forms of 1,5-bis(4-pyridyl)-1,4-pentadiene-3-one: establishing
 mechanism using single crystal X-ray, UV and 1H NMR
;
_journal_issue                   9
_journal_name_full               CrystEngComm
_journal_page_first              3246
_journal_paper_doi               10.1039/c0ce00612b
_journal_volume                  13
_journal_year                    2011
_chemical_formula_sum            'C21 H18 N2 O4'
_chemical_formula_weight         362.37
_chemical_name_common
(1,5-bis(4-pyridyl)-1,4-pentadiene-3-one).(phloroglucinol)
_chemical_name_systematic
;
(1,5-bis(4-pyridyl)-1,4-pentadiene-3-one).(phloroglucinol)
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                76.149(3)
_cell_angle_beta                 88.030(3)
_cell_angle_gamma                67.701(3)
_cell_formula_units_Z            2
_cell_length_a                   8.6268(9)
_cell_length_b                   9.6019(10)
_cell_length_c                   12.1252(13)
_cell_measurement_reflns_used    3341
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      25.49
_cell_measurement_theta_min      1.73
_cell_volume                     900.46(17)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Bruker CCD APEX-2'
_diffrn_measurement_method       hemisphere
_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  0.0254
_diffrn_reflns_av_sigmaI/netI    0.0252
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            11171
_diffrn_reflns_theta_full        25.49
_diffrn_reflns_theta_max         25.49
_diffrn_reflns_theta_min         1.73
_exptl_absorpt_coefficient_mu    0.094
_exptl_absorpt_correction_T_max  0.987
_exptl_absorpt_correction_T_min  0.981
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.337
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plates
_exptl_crystal_F_000             380
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.156
_refine_diff_density_min         -0.172
_refine_diff_density_rms         0.030
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.978
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     298
_refine_ls_number_reflns         3341
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.978
_refine_ls_R_factor_all          0.0617
_refine_ls_R_factor_gt           0.0408
_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^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1282
_refine_ls_wR_factor_ref         0.1416
_reflns_number_gt                2424
_reflns_number_total             3341
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c0ce00612b.txt
_cod_data_source_block           6
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1555 2011-01-17 13:19:09Z saulius 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_cell_volume        900.46(16)
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7205674