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_7205676
_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            'C30 H24 N4 O2'
_chemical_formula_weight         472.53
_chemical_name_common
1,3-bis(4-pyridyl)-2,4-bis(-3(4-pyridyl)propenoyl)cyclobutane
_chemical_name_systematic
;
1,3-bis(4-pyridyl)-2,4-bis(-3(4-pyridyl)propenoyl)cyclobutane
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 102.280(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.178(5)
_cell_length_b                   6.090(2)
_cell_length_c                   26.470(8)
_cell_measurement_reflns_used    3909
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      25.00
_cell_measurement_theta_min      1.43
_cell_volume                     2390.7(13)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.927
_diffrn_measured_fraction_theta_max 0.927
_diffrn_measurement_device_type  'Bruker-APEX-2 CCD area detector'
_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  0.1187
_diffrn_reflns_av_sigmaI/netI    0.0841
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       31
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            24331
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.43
_exptl_absorpt_coefficient_mu    0.084
_exptl_absorpt_correction_T_max  0.95
_exptl_absorpt_correction_T_min  0.93
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.313
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             992
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.220
_refine_diff_density_min         -0.200
_refine_diff_density_rms         0.050
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.966
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     325
_refine_ls_number_reflns         3909
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.966
_refine_ls_R_factor_all          0.1758
_refine_ls_R_factor_gt           0.0761
_refine_ls_shift/su_max          0.002
_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          0.1718
_refine_ls_wR_factor_ref         0.2028
_reflns_number_gt                1839
_reflns_number_total             3909
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c0ce00612b.txt
_cod_data_source_block           8
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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        2390.9(13)
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7205676