The interplay between hydrogen bonding and π-π stacking interactions in the crystal packing of N1-thyminyl derivatives, and implications for the photo-chemical [2π + 2π]-cycloaddition of thyminyl compounds.
Johnston, Priscilla; Izgorodina, Ekaterina I.; Saito, Kei; Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology 11 (2012) 1938–1951; doi:10.1039/c2pp25228g

data_1515316
_publ_section_title
;
 The interplay between hydrogen bonding and \p-\p stacking interactions in
 the crystal packing of N1-thyminyl derivatives, and implications for the
 photo-chemical [2\p + 2\p]-cycloaddition of thyminyl compounds.
;
_journal_issue                   12
_journal_name_full
'Photochemical &amp; photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology'
_journal_page_first              1938
_journal_page_last               1951
_journal_paper_doi               10.1039/c2pp25228g
_journal_volume                  11
_journal_year                    2012
_chemical_formula_moiety         'C8 H11 N3 O3'
_chemical_formula_sum            'C8 H11 N3 O3'
_chemical_formula_weight         197.20
_chemical_name_common            ThyPropAmide
_chemical_name_systematic
;
ThyPropAmide
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 90.18(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   7.3571(15)
_cell_length_b                   15.243(3)
_cell_length_c                   15.854(3)
_cell_measurement_reflns_used    12491
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.88
_cell_measurement_theta_min      0.41
_cell_volume                     1777.9(6)
_computing_cell_refinement       'DENZO-SMN (Otwinoski & Minor, 1997)'
_computing_data_collection       'Nonius Collect'
_computing_data_reduction        'DENZO-SMN (Otwinoski & Minor, 1997)'
_computing_molecular_graphics    X-Seed
_computing_publication_material  CIFTAB
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.941
_diffrn_measured_fraction_theta_max 0.941
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_diffrn_measurement_method       'phi and omega scans'
_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  0.0408
_diffrn_reflns_av_sigmaI/netI    0.0372
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            10151
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.85
_exptl_absorpt_coefficient_mu    0.115
_exptl_absorpt_correction_T_max  0.9886
_exptl_absorpt_correction_T_min  0.9819
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SORTAV (Blessing, 1997)'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.473
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Needle
_exptl_crystal_F_000             832
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.150
_refine_diff_density_min         -0.222
_refine_diff_density_rms         0.042
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.060
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     279
_refine_ls_number_reflns         2947
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.060
_refine_ls_R_factor_all          0.0539
_refine_ls_R_factor_gt           0.0370
_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^)+(0.0372P)^2^+0.5800P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0814
_refine_ls_wR_factor_ref         0.0891
_reflns_number_gt                2350
_reflns_number_total             2947
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2pp25228g.txt
_cod_data_source_block           ThyPropAmide_Cmpd7
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               1515316