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_7106216
_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         'C27 H21 N7'
_chemical_formula_sum            'C27 H21 N7'
_chemical_formula_weight         443.50
_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   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 92.218(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   23.1039(7)
_cell_length_b                   6.0491(2)
_cell_length_c                   15.7821(5)
_cell_measurement_reflns_used    2609
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      50.10
_cell_measurement_theta_min      3.83
_cell_volume                     2204.02(12)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_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           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0364
_diffrn_reflns_av_sigmaI/netI    0.0338
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -3
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            8349
_diffrn_reflns_theta_full        50.31
_diffrn_reflns_theta_max         50.31
_diffrn_reflns_theta_min         1.91
_exptl_absorpt_coefficient_mu    0.663
_exptl_absorpt_correction_T_max  0.9960
_exptl_absorpt_correction_T_min  0.9247
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            red-brown
_exptl_crystal_density_diffrn    1.337
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             928
_exptl_crystal_size_max          0.12
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.177
_refine_diff_density_min         -0.169
_refine_diff_density_rms         0.034
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.854
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     391
_refine_ls_number_reflns         2263
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.854
_refine_ls_R_factor_all          0.0444
_refine_ls_R_factor_gt           0.0335
_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          0.0956
_refine_ls_wR_factor_ref         0.1064
_reflns_number_gt                1873
_reflns_number_total             2263
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1cc10247h.txt
_cod_data_source_block           4
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               7106216