Manipulating the proton transfer process in molecular complexes: synthesis and spectroscopic studies.
Panja, Sumit Kumar; Dwivedi, Nidhi; Saha, Satyen; Physical chemistry chemical physics : PCCP 18 (2016) 21600–21609; doi:10.1039/c6cp03797f

data_7226111
_publ_section_title
;
 Manipulating the proton transfer process in molecular complexes:
 synthesis and spectroscopic studies.
;
_journal_issue                   31
_journal_name_full               'Physical chemistry chemical physics : PCCP'
_journal_page_first              21600
_journal_page_last               21609
_journal_paper_doi               10.1039/c6cp03797f
_journal_volume                  18
_journal_year                    2016
_chemical_formula_moiety         'C17 H18 N2 O5'
_chemical_formula_sum            'C17 H18 N2 O5'
_chemical_formula_weight         330.33
_chemical_name_common            1H-Chromene
_chemical_name_systematic
;
  ethyl 2-amino-4-(1-cyano-2-ethoxy-2-oxoethyl)-4H-chromene-3-carboxylate
;
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   mixed
_audit_block_doi                 10.5517/cc10s1jc
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2015-07-16 deposited with the CCDC.
2016-07-18 downloaded from the CCDC.
;
_cell_angle_alpha                90.000(5)
_cell_angle_beta                 93.690(5)
_cell_angle_gamma                90.000(5)
_cell_formula_units_Z            4
_cell_length_a                   9.271(5)
_cell_length_b                   8.507(5)
_cell_length_c                   21.337(5)
_cell_measurement_reflns_used    2141
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      0.971
_cell_measurement_theta_min      0.966
_cell_volume                     1679.3(14)
_computing_cell_refinement
;
CrysAlisPro, Agilent Technologies,
Version 1.171.34.49 (release 20-01-2011 CrysAlis171 .NET)
(compiled Jan 20 2011,15:58:25)
;
_computing_data_collection
;
CrysAlisPro, Agilent Technologies,
Version 1.171.34.49 (release 20-01-2011 CrysAlis171 .NET)
(compiled Jan 20 2011,15:58:25)
;
_computing_data_reduction
;
CrysAlisPro, Agilent Technologies,
Version 1.171.34.49 (release 20-01-2011 CrysAlis171 .NET)
(compiled Jan 20 2011,15:58:25)
;
_computing_molecular_graphics    'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution
;
 Reflections were merged by SHELXL according to the crystal
 class for the calculation of statistics and refinement.
 _reflns_Friedel_fraction is defined as the number of unique
 Friedel pairs measured divided by the number that would be
 possible theoretically, ignoring centric projections and
 systematic absences.
;
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 16.0938
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.856
_diffrn_measurement_device_type  'Xcalibur, Eos'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0384
_diffrn_reflns_av_unetI/netI     0.0752
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.856
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            7434
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.856
_diffrn_reflns_theta_full        25.000
_diffrn_reflns_theta_max         29.022
_diffrn_reflns_theta_min         3.253
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.097
_exptl_absorpt_correction_T_max  0.971
_exptl_absorpt_correction_T_min  0.966
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Agilent Technologies,
Version 1.171.34.49 (release 20-01-2011 CrysAlis171 .NET)
(compiled Jan 20 2011,15:58:25)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            BROWN
_exptl_crystal_density_diffrn    1.307
_exptl_crystal_description       rectangular
_exptl_crystal_F_000             676
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.3
_refine_diff_density_max         0.444
_refine_diff_density_min         -0.421
_refine_diff_density_rms         0.067
_refine_ls_extinction_coef       0.001(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2014/7 (Sheldrick 2014'
_refine_ls_goodness_of_fit_ref   1.061
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     228
_refine_ls_number_reflns         3832
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.061
_refine_ls_R_factor_all          0.1460
_refine_ls_R_factor_gt           0.0876
_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^)+(0.1271P)^2^+0.7021P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2360
_refine_ls_wR_factor_ref         0.2815
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2141
_reflns_number_total             4477
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c6cp03797f2.cif
_cod_data_source_block           shelx
_cod_database_code               7226111
_shelx_shelxl_version_number     2014/7
_exptl_absorpt_special_details
;
 Refinement of F^2^ against ALL reflections.  The weighted R-factor wR and
 goodness of fit S are based on F^2^, conventional R-factors R are based
 on F, with F set to zero for negative F^2^. The threshold expression of
 F^2^ > 2sigma(F^2^) is used only for calculating R-factors(gt) etc. and is
 not relevant to the choice of reflections for refinement.  R-factors based
 on F^2^ are statistically about twice as large as those based on F, and R-
 factors based on ALL data will be even larger.
;
_shelx_res_checksum              86892