Synthesis, Photophysical Behavior, and Electronic Structure of Push-Pull Purines
Roslyn S. Butler; Pamela Cohn; Phillip Tenzel; Khalil A. Abboud; Ronald K. Castellano; Journal of the American Chemical Society 131 (2009) 623–633; doi:10.1021/ja806348z

data_4103751
_publ_section_title
;
 Synthesis, Photophysical Behavior, and Electronic Structure of Push-Pull
 Purines
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              623
_journal_page_last               633
_journal_paper_doi               10.1021/ja806348z
_journal_volume                  131
_journal_year                    2009
_chemical_formula_sum            'C16 H18 N6 O2'
_chemical_formula_weight         326.36
_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                84.052(4)
_cell_angle_beta                 84.765(3)
_cell_angle_gamma                88.383(4)
_cell_formula_units_Z            2
_cell_length_a                   6.4306(13)
_cell_length_b                   10.050(2)
_cell_length_c                   11.980(2)
_cell_measurement_reflns_used    50
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      28.0
_cell_measurement_theta_min      2.0
_cell_volume                     766.7(3)
_computing_cell_refinement
'Bruker SMART v5.624 & SAINT 6.36a (Bruker 1998)'
_computing_data_collection       'Bruker SMART v5.624 (Bruker 1998)'
_computing_data_reduction        'Bruker SHELXTL v6.14 (Bruker 2000)'
_computing_molecular_graphics    'Bruker SHELXTL v6.14'
_computing_publication_material  'Bruker SHELXTL v6.14'
_computing_structure_refinement  'Bruker SHELXTL v6.14'
_computing_structure_solution    'Bruker SHELXTL v6.14'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.977
_diffrn_measured_fraction_theta_max 0.977
_diffrn_measurement_device_type  'SMART CCD area detector'
_diffrn_measurement_method       '\w 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  0.0248
_diffrn_reflns_av_sigmaI/netI    0.0364
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            5277
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         1.72
_diffrn_standards_decay_%        1
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.099
_exptl_absorpt_correction_T_max  0.9931
_exptl_absorpt_correction_T_min  0.9873
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details
'based on measured indexed crystal faces, Bruker SHELXTL  v6.12 (Bruker 1998)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.414
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needles
_exptl_crystal_F_000             344
_exptl_crystal_size_max          0.13
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.200
_refine_diff_density_min         -0.228
_refine_diff_density_rms         0.044
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.029
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     227
_refine_ls_number_reflns         3445
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.029
_refine_ls_R_factor_all          0.0550
_refine_ls_R_factor_gt           0.0392
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0592P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0982
_refine_ls_wR_factor_ref         0.1046
_reflns_number_gt                2572
_reflns_number_total             3445
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ja806348z_si_002.cif
_cod_data_source_block           rlm4
_cod_database_code               4103751