CH~3~CN: X-ray structural investigation of a unique single crystal. β → α phase transition and crystal structure
Enjalbert, Renée; Galy, Jean; Acta Crystallographica Section B 58 (2002) 1005–1010; doi:10.1107/S0108768102017603

data_2103498
_publ_section_title
;
 CH~3~CN: X-ray structural investigation of a unique single crystal. \b
 \\rightarrow \a phase transition and crystal structure
;
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              1005
_journal_page_last               1010
_journal_paper_doi               10.1107/S0108768102017603
_journal_volume                  58
_journal_year                    2002
_chemical_formula_moiety         'C2 H3 N'
_chemical_formula_structural     'C H3 C N'
_chemical_formula_sum            'C2 H3 N'
_chemical_formula_weight         41.05
_chemical_name_systematic        acetonitrile
_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   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 100.10(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   4.102(3)
_cell_length_b                   8.244(7)
_cell_length_c                   7.970(7)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    201(2)
_cell_measurement_theta_max      21.48
_cell_measurement_theta_min      5.20
_cell_volume                     265.3(4)
_computing_cell_refinement       'CAD4-EXPRESS (Enraf-Nonius, 1993)'
_computing_data_collection       'CAD4-EXPRESS (Enraf-Nonius, 1993)'
_computing_data_reduction        'CADAK (Savariault,1991)'
_computing_molecular_graphics    'ORTEP III (Burnett & Johnson, 1996)'
_computing_publication_material  'SHELXL-96 (Sheldrick, 1996)'
_computing_structure_refinement  'SHELXL-96 (Sheldrick, 1996)'
_computing_structure_solution    'SHELXS-96 (Sheldrick, 1990)'
_diffrn_ambient_temperature      201(2)
_diffrn_measured_fraction_theta_full 0.99
_diffrn_measured_fraction_theta_max 0.99
_diffrn_measurement_device       'Nonius CAD4 diffractometer'
_diffrn_measurement_method       \w--2\q
_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  0.0571
_diffrn_reflns_av_sigmaI/netI    0.0591
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            376
_diffrn_reflns_theta_full        21.89
_diffrn_reflns_theta_max         21.89
_diffrn_reflns_theta_min         3.58
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.067
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.028
_exptl_crystal_description       cylinder
_exptl_crystal_F_000             88
_exptl_crystal_size_max          1.2
_exptl_crystal_size_mid          0.5
_exptl_crystal_size_min          0.3
_exptl_crystal_size_rad          0.15
_refine_diff_density_max         0.169
_refine_diff_density_min         -0.168
_refine_ls_extinction_coef       0.07(4)
_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_all   1.137
_refine_ls_goodness_of_fit_ref   1.107
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     41
_refine_ls_number_reflns         324
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.137
_refine_ls_restrained_S_obs      1.107
_refine_ls_R_factor_all          0.1051
_refine_ls_R_factor_gt           0.0472
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0360P)^2^+0.1879P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1504
_refine_ls_wR_factor_ref         0.1106
_reflns_number_gt                202
_reflns_number_total             324
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            os0098.cif
_cod_data_source_block           II
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2103498