Carbon−Silicon Hyperconjugation and Strain-Enhanced Hyperconjugation: Structures ofN-Methyl 2- and 4-tert-Butyldimethylsilylmethyl Pyridinium Cations
Hassall, Kathryn; Lobachevsky, Sofia; Schiesser, Carl H.; White, Jonathan M.; Organometallics 26 (2007) 1361–; doi:10.1021/om060939e

data_4072675
_publ_section_title
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 Carbon&#x2212;Silicon Hyperconjugation and Strain-Enhanced
 Hyperconjugation:&#x00A0; Structures ofN-Methyl 2- and
 4-tert-Butyldimethylsilylmethyl Pyridinium Cations
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_journal_issue                   6
_journal_name_full               Organometallics
_journal_page_first              1361
_journal_paper_doi               10.1021/om060939e
_journal_volume                  26
_journal_year                    2007
_chemical_formula_sum            'C14 H24 F3 N O3 S Si'
_chemical_formula_weight         371.49
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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            8
_cell_length_a                   10.7340(5)
_cell_length_b                   11.2427(5)
_cell_length_c                   31.3159(15)
_cell_measurement_reflns_used    9279
_cell_measurement_temperature    130(2)
_cell_measurement_theta_max      27.40
_cell_measurement_theta_min      2.30
_cell_volume                     3779.2(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'WinGX ORTEP3'
_computing_publication_material  'WinGX SHELXTL'
_computing_structure_refinement  'WinGX SHELXTL'
_computing_structure_solution    'WinGX SHELXTL'
_diffrn_ambient_temperature      130(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         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0510
_diffrn_reflns_av_sigmaI/netI    0.0257
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       37
_diffrn_reflns_limit_l_min       -34
_diffrn_reflns_number            18612
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.30
_exptl_absorpt_coefficient_mu    0.273
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.306
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1568
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.349
_refine_diff_density_min         -0.234
_refine_diff_density_rms         0.056
_refine_ls_extinction_coef       0.0012(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.072
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     215
_refine_ls_number_reflns         3332
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.072
_refine_ls_R_factor_all          0.0435
_refine_ls_R_factor_gt           0.0396
_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^)+(0.0616P)^2^+1.1212P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1054
_refine_ls_wR_factor_ref         0.1078
_reflns_number_gt                2983
_reflns_number_total             3332
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om060939esi20061012_125055.cif
_cod_data_source_block           jmwkh37
_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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'Pbca '
_cod_database_code               4072675