A fluorine scan of the phenylamidinium needle of tricyclic thrombin inhibitors: effects of fluorine substitution on pKa and binding affinity and evidence for intermolecular C-F...CN interactions.
Olsen, Jacob; Seiler, Paul; Wagner, Björn; Fischer, Holger; Tschopp, Thomas; Obst-Sander, Ulrike; Banner, David W.; Kansy, Manfred; Müller, Klaus; Diederich, François; Organic & biomolecular chemistry 2 (2004) 1339–1352; doi:10.1039/b402515f

data_7151616
_publ_section_title
;
 A fluorine scan of the phenylamidinium needle of tricyclic thrombin
 inhibitors: effects of fluorine substitution on pKa and binding
 affinity and evidence for intermolecular C-F...CN interactions.
;
_journal_issue                   9
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              1339
_journal_page_last               1352
_journal_paper_doi               10.1039/b402515f
_journal_volume                  2
_journal_year                    2004
_chemical_formula_moiety         'C8 H3 F2 N O'
_chemical_formula_sum            'C8 H3 F2 N O'
_chemical_formula_weight         167.11
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   3.7369(2)
_cell_length_b                   6.2036(3)
_cell_length_c                   28.8526(18)
_cell_measurement_reflns_used    801
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.45
_cell_measurement_theta_min      3.36
_cell_volume                     668.87(6)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Kappa CCD'
_computing_data_reduction        'Denzo + Scalepak (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'ORTEP (Johnson,1976)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR92 (Altomare et Al., 1994)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.951
_diffrn_measured_fraction_theta_max 0.951
_diffrn_measurement_device_type  'Kappa CCD'
_diffrn_measurement_method       CCD
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71070
_diffrn_reflns_av_R_equivalents  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0469
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       37
_diffrn_reflns_limit_l_min       -36
_diffrn_reflns_number            1401
_diffrn_reflns_theta_full        27.45
_diffrn_reflns_theta_max         27.45
_diffrn_reflns_theta_min         3.36
_exptl_absorpt_coefficient_mu    0.149
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.660
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'Cut fragment'
_exptl_crystal_F_000             336
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.194
_refine_diff_density_min         -0.197
_refine_diff_density_rms         0.042
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.4(9)
_refine_ls_extinction_coef       0.027(5)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL97
_refine_ls_goodness_of_fit_ref   1.052
_refine_ls_hydrogen_treatment    'H-atoms riding'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     113
_refine_ls_number_reflns         1401
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.052
_refine_ls_R_factor_all          0.0405
_refine_ls_R_factor_gt           0.0327
_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^)+(0.0000P)^2^+0.2701P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0677
_refine_ls_wR_factor_ref         0.0722
_reflns_number_gt                1267
_reflns_number_total             1401
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b402515f.txt
_cod_data_source_block           olsen17
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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 1527 2010-12-29 10:47:43Z saulius 
;
_cod_database_code               7151616