Expanding the chemical space for push-pull chromophores by non-concerted [2+2] and [4+2] cycloadditions: access to a highly functionalized 6,6-dicyanofulvene with an intense, low-energy charge-transfer band;
Govindasamy Jayamurugan; Jean-Paul Gisselbrecht; Corinne Boudon; Franziska Schoenebeck; W. Bernd Schweizer; Bruno Bernet; Francois Diederich; Chem.Commun. 47 (2011) 4520–; doi:10.1039/c1cc10247h

data_7106217
_publ_section_title
;
 Expanding the chemical space for push-pull chromophores by non-concerted
 [2+2] and [4+2] cycloadditions: access to a highly functionalized
 6,6-dicyanofulvene with an intense, low-energy charge-transfer band;
;
_journal_name_full               Chem.Commun.
_journal_page_first              4520
_journal_paper_doi               10.1039/c1cc10247h
_journal_volume                  47
_journal_year                    2011
_chemical_formula_moiety         'C17 H10 N6'
_chemical_formula_sum            'C17 H10 N6'
_chemical_formula_weight         298.30
_space_group_IT_number           78
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P 4cw'
_symmetry_space_group_name_H-M   'P 43'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00(0)
_cell_angle_beta                 90.0(0)
_cell_angle_gamma                90.00(0)
_cell_formula_units_Z            4
_cell_length_a                   11.5737(3)
_cell_length_b                   11.5737(3)
_cell_length_c                   11.5001(5)
_cell_measurement_reflns_used    4479
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      26.40
_cell_measurement_theta_min      2.49
_cell_volume                     1540.44(9)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    Platon
_computing_publication_material  OLEX2
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w 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  0.0153
_diffrn_reflns_av_sigmaI/netI    0.0383
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            10808
_diffrn_reflns_theta_full        26.44
_diffrn_reflns_theta_max         26.46
_diffrn_reflns_theta_min         1.76
_exptl_absorpt_coefficient_mu    0.084
_exptl_absorpt_correction_T_max  0.9875
_exptl_absorpt_correction_T_min  0.9867
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    1.310
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       cube
_exptl_crystal_F_000             638
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.216
_refine_diff_density_min         -0.241
_refine_diff_density_rms         0.045
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.228
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     241
_refine_ls_number_reflns         3106
_refine_ls_number_restraints     9
_refine_ls_restrained_S_all      1.227
_refine_ls_R_factor_all          0.0566
_refine_ls_R_factor_gt           0.0509
_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^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1492
_refine_ls_wR_factor_ref         0.1535
_reflns_number_gt                7672
_reflns_number_total             8470
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1cc10247h.txt
_cod_data_source_block           1
_cod_original_cell_volume        1540.43(10)
_cod_original_sg_symbol_H-M      P4(3)
_cod_database_code               7106217