Interpretation of substituent effects on (13)C and (15)N NMR chemical shifts in 6-substituted purines.
Standara, Stanislav; Bouzková, Kateřina; Straka, Michal; Zacharová, Zuzana; Hocek, Michal; Marek, Jaromír; Marek, Radek; Physical chemistry chemical physics : PCCP 13 (2011) 15854–15864; doi:10.1039/c1cp20680j

data_7206436
_publ_section_title
;
 Interpretation of substituent effects on (13)C and (15)N NMR chemical
 shifts in 6-substituted purines.
;
_journal_issue                   35
_journal_name_full               'Physical chemistry chemical physics : PCCP'
_journal_page_first              15854
_journal_page_last               15864
_journal_paper_doi               10.1039/c1cp20680j
_journal_volume                  13
_journal_year                    2011
_chemical_formula_sum            'C13 H13 N5'
_chemical_formula_weight         239.28
_chemical_name_common            9-benzyl-N-methyl-9H-purin-6-amine
_chemical_name_systematic
;
9-benzyl-N-methyl-9H-purin-6-amine
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 96.616(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   21.133(2)
_cell_length_b                   8.8277(12)
_cell_length_c                   13.0345(16)
_cell_measurement_reflns_used    2069
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      21.9335
_cell_measurement_theta_min      1.962
_cell_volume                     2415.5(5)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 8.3611
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'KUMA KM4 + CCD'
_diffrn_measurement_method       'rotation method, \w--scan'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Enhance (Mo) X-ray Source'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0425
_diffrn_reflns_av_sigmaI/netI    0.0412
_diffrn_reflns_limit_h_max       26
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            11355
_diffrn_reflns_theta_full        26.80
_diffrn_reflns_theta_max         26.80
_diffrn_reflns_theta_min         2.90
_exptl_absorpt_coefficient_mu    0.085
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.316
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             1008
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.40
_refine_diff_density_max         0.202
_refine_diff_density_min         -0.190
_refine_diff_density_rms         0.040
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.953
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     255
_refine_ls_number_reflns         2561
_refine_ls_number_restraints     6
_refine_ls_restrained_S_all      0.952
_refine_ls_R_factor_all          0.0709
_refine_ls_R_factor_gt           0.0412
_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^)+(0.0640P)^2^+0.0500P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1000
_refine_ls_wR_factor_ref         0.1143
_reflns_number_gt                1603
_reflns_number_total             2561
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1cp20680j.txt
_cod_data_source_block           rm-2b
_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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        2415.4(5)
_cod_original_sg_symbol_H-M      ' C 2/c '
_cod_database_code               7206436