Synthesis and X-ray Characterization of Alkali Metal 2-Acyl-1,1,3,3-tetracyanopropenides.
Karpov, Sergey V.; Grigor'ev, Arthur A.; Kayukov, Yakov S.; Karpova, Irina V.; Nasakin, Oleg E.; Tafeenko, Victor A.; The Journal of organic chemistry 81 (2016) 6402–6408; doi:10.1021/acs.joc.6b01040

data_4036939
_publ_section_title
;
 Synthesis and X-ray Characterization of Alkali Metal
 2-Acyl-1,1,3,3-tetracyanopropenides.
;
_journal_issue                   15
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              6402
_journal_page_last               6408
_journal_paper_doi               10.1021/acs.joc.6b01040
_journal_volume                  81
_journal_year                    2016
_chemical_formula_moiety         'C14 H5 N4 O Rb'
_chemical_formula_sum            'C14 H5 N4 O Rb'
_chemical_formula_weight         330.69
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_cell_setting           monoclinic
_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                 107.183(12)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.3706(12)
_cell_length_b                   17.767(5)
_cell_length_c                   8.5579(11)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      18
_cell_measurement_theta_min      14
_cell_volume                     1361.2(5)
_computing_cell_refinement       'CAD-4 Software'
_computing_data_collection       'CAD-4 Software (Enraf-Nonius, 1989)'
_computing_data_reduction        'XCAD-4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    'DIAMOND (Brandenburg, 2000)'
_computing_publication_material  'WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 0.981
_diffrn_measured_fraction_theta_max 0.981
_diffrn_measurement_device_type  'Enraf-Nonius CAD-4 diffractometr'
_diffrn_measurement_method       'non-profiled omega scan'
_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  0.054
_diffrn_reflns_av_sigmaI/netI    0.0745
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            2904
_diffrn_reflns_theta_full        26.97
_diffrn_reflns_theta_max         26.97
_diffrn_reflns_theta_min         2.27
_diffrn_standards_decay_%        none
_exptl_absorpt_coefficient_mu    3.637
_exptl_absorpt_correction_T_max  0.6464
_exptl_absorpt_correction_T_min  0.3561
_exptl_absorpt_correction_type   refdelf
_exptl_absorpt_process_details
;
(See: Walker, N. & Stuart, D. (1983) Acta Cryst. A39, 158-166)
;
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.614
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             648
_exptl_crystal_size_max          .25
_exptl_crystal_size_mid          .2
_exptl_crystal_size_min          .2
_refine_diff_density_max         0.299
_refine_diff_density_min         -0.384
_refine_diff_density_rms         0.069
_refine_ls_extinction_coef       0.0026(7)
_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   0.974
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     182
_refine_ls_number_reflns         2904
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.974
_refine_ls_R_factor_all          0.0985
_refine_ls_R_factor_gt           0.0449
_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^)+(0.0305P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0696
_refine_ls_wR_factor_ref         0.0802
_reflns_number_gt                1713
_reflns_number_total             2904
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo6b01040_si_004.cif
_cod_data_source_block           rb
_cod_original_cell_volume        1361.2(4)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4036939