Solvatochromic fluorescent 2-substituted 3-ethynyl quinoxalines: four-component synthesis, photophysical properties, and electronic structure.
Gers, Charlotte F; Nordmann, Jan; Kumru, Ceyda; Frank, Walter; Müller, Thomas J J; The Journal of organic chemistry 79 (2014) 3296–3310; doi:10.1021/jo4025978

data_4029212
_publ_section_title
;
 Solvatochromic fluorescent 2-substituted 3-ethynyl quinoxalines:
 four-component synthesis, photophysical properties, and electronic
 structure.
;
_journal_issue                   8
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              3296
_journal_page_last               3310
_journal_paper_doi               10.1021/jo4025978
_journal_volume                  79
_journal_year                    2014
_chemical_formula_moiety         'C27 H16 N4'
_chemical_formula_sum            'C27 H16 N4'
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_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
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_atom_sites_solution_secondary   difmap
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_cell_angle_beta                 105.625(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.3440(6)
_cell_length_b                   9.3130(5)
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_cell_measurement_temperature    253(2)
_cell_measurement_theta_max      29.68
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_cell_volume                     2030.06(18)
_computing_cell_refinement
;
<i>CrysAlis PRO</i>, Ver.1.171.33.52 (Oxford Diffraction Ltd., 2009)
;
_computing_data_collection
;
<i>CrysAlis PRO</i>, Ver.1.171.33.52 (Oxford Diffraction Ltd., 2009)
;
_computing_data_reduction
;
<i>CrysAlis PRO</i>, Ver.1.171.33.52 (Oxford Diffraction Ltd., 2009)
;
_computing_molecular_graphics    'SHELXTL (Sheldrick, 1998)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      253(2)
_diffrn_detector_area_resol_mean 32.3
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_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Xcalibur, Eos'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
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_diffrn_reflns_av_R_equivalents  0.0498
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_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
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_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       21
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_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.31
_diffrn_standards_decay_%        0
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_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.297
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             824
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.33
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_refine_ls_extinction_method     none
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_refine_ls_number_reflns         3579
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.019
_refine_ls_R_factor_all          0.0449
_refine_ls_R_factor_gt           0.0399
_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^)+(0.0518P)^2^+0.5600P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1034
_refine_ls_wR_factor_ref         0.1071
_reflns_number_gt                3256
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_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo4025978_si_003.cif
_cod_data_source_block           no_125
_cod_depositor_comments
;Adding full bibliography for
 ./tmp-cod-update-bibliographies-12971/cifs/4029212.cif.
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4029212