Alkynyl and Phosphonyl Substituted Nucleobases: A Case of Thermally Induced Conformational Polymorphism
Kumara Swamy, K. C.; Allu, Srinivasarao; Srinivas, Venu; Balaraman, E.; Kumar, K. V. P. Pavan; Crystal Growth & Design 11 (2011) 2302–; doi:10.1021/cg101737x

data_4500588
_publ_section_title
;
 Alkynyl and Phosphonyl Substituted Nucleobases: A Case of Thermally
 Induced Conformational Polymorphism
;
_journal_issue                   6
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              2302
_journal_paper_doi               10.1021/cg101737x
_journal_volume                  11
_journal_year                    2011
_chemical_formula_sum            'C21 H37 N5'
_chemical_formula_weight         359.56
_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                 94.290(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   22.836(3)
_cell_length_b                   8.177(1)
_cell_length_c                   11.577(1)
_cell_measurement_temperature    298(2)
_cell_volume                     2155.7(4)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'ORTEP-III (Burnett & Johnson, 1996)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'CCD area detector'
_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  0.0564
_diffrn_reflns_av_sigmaI/netI    0.0412
_diffrn_reflns_limit_h_max       27
_diffrn_reflns_limit_h_min       -27
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            19965
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.79
_diffrn_standards_decay_%        none
_diffrn_standards_interval_count 'not applicable'
_diffrn_standards_interval_time  'not applicable'
_diffrn_standards_number         'not applicable'
_exptl_absorpt_coefficient_mu    0.067
_exptl_absorpt_correction_T_max  0.9906
_exptl_absorpt_correction_T_min  0.9854
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS, Sheldrick (1996)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.108
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       blocks
_exptl_crystal_F_000             792
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.223
_refine_diff_density_min         -0.135
_refine_diff_density_rms         0.034
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.998
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     236
_refine_ls_number_reflns         3792
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.998
_refine_ls_R_factor_all          0.1173
_refine_ls_R_factor_gt           0.0590
_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^)+(0.0855P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1427
_refine_ls_wR_factor_ref         0.1673
_reflns_number_gt                2158
_reflns_number_total             3792
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg101737x_si_002.cif
_cod_data_source_block           compd9
_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        2156.0(4)
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               4500588