3,6-Di(pyridin-2-yl)-1,2,4,5-tetrazine (pytz) mediated metal-free mild oxidation of thiols to disulfides in aqueous medium
Samanta, Suvendu; Ray, Shounak; Ghosh, Abhisek Brata; Biswas, Papu; RSC Adv.  (2016) –; doi:10.1039/C6RA01509C

data_7224941
_publ_section_title
;
 3,6-Di(pyridin-2-yl)-1,2,4,5-tetrazine (pytz) mediated metal-free mild
 oxidation of thiols to disulfides in aqueous medium
;
_journal_name_full               'RSC Adv.'
_journal_paper_doi               10.1039/C6RA01509C
_journal_year                    2016
_chemical_formula_sum            'C12 H10 N6'
_chemical_formula_weight         238.26
_chemical_name_systematic
'3,6-di(pyridin-2-yl)-1,4-dihydro-1,2,4,5-tetrazine'
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2015-11-19 deposited with the CCDC.
2016-04-13 downloaded from the CCDC.
;
_cell_angle_alpha                102.040(2)
_cell_angle_beta                 111.9550(10)
_cell_angle_gamma                90.162(2)
_cell_formula_units_Z            2
_cell_length_a                   8.1982(6)
_cell_length_b                   8.2816(6)
_cell_length_c                   8.8622(6)
_cell_measurement_reflns_used    5487
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      27.44
_cell_measurement_theta_min      2.52
_cell_volume                     543.61(7)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      120(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0199
_diffrn_reflns_av_sigmaI/netI    0.0202
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            6902
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         2.52
_diffrn_standards_decay_%        <1
_exptl_absorpt_coefficient_mu    0.096
_exptl_absorpt_correction_T_max  0.9791
_exptl_absorpt_correction_T_min  0.9607
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1997)'
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.456
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rectangular
_exptl_crystal_F_000             248
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: DCM-Toluene'
_exptl_crystal_size_max          0.42
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.22
_refine_diff_density_max         0.243
_refine_diff_density_min         -0.181
_refine_diff_density_rms         0.042
_refine_ls_extinction_coef       0.108(8)
_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   1.030
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     180
_refine_ls_number_reflns         2116
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.030
_refine_ls_R_factor_all          0.0342
_refine_ls_R_factor_gt           0.0327
_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^)+(0.0493P)^2^+0.2021P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0931
_refine_ls_wR_factor_ref         0.0945
_reflns_number_gt                1990
_reflns_number_total             2116
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c6ra01509c2.cif
_cod_data_source_block           H2pytz
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to
/usr/data/users/saulius/crontab/automatic-downloads/rss-feeds/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 4268 2015-11-12 08:31:59Z antanas 
;
_cod_original_sg_symbol_H-M      'P-1   '
_cod_database_code               7224941