Helical folding in heterogeneous foldamers without inter-residual backbone hydrogen-bonding
Gowri Priya; Amol Kotmale; Rupesh Gawade; Deepti Mishra; Sourav Pal; Vedavati Puranik; Pattuparambil Rajamohanan; Gangadhar J.Sanjayan; Chem.Commun. 48 (2012) 8922–; doi:10.1039/c2cc33235c

data_7108235
_publ_section_title
;
 Helical folding in heterogeneous foldamers without inter-residual
 backbone hydrogen-bonding
;
_journal_name_full               Chem.Commun.
_journal_page_first              8922
_journal_paper_doi               10.1039/c2cc33235c
_journal_volume                  48
_journal_year                    2012
_chemical_formula_moiety         'C27 H34 N4 O7 S2'
_chemical_formula_sum            'C27 H34 N4 O7 S2'
_chemical_formula_weight         590.70
_chemical_melting_point          361(2)
_chemical_name_common            foldamers
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.077(1)
_cell_length_b                   16.020(2)
_cell_length_c                   17.325(2)
_cell_measurement_reflns_used    4416
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      25.911
_cell_measurement_theta_min      2.235
_cell_volume                     3074.4(6)
_computing_cell_refinement       'BRUKER SAINT'
_computing_data_collection       'BRUKER SMART'
_computing_data_reduction        'BRUKER SAINT'
_computing_molecular_graphics    'SHELXTL, PyMOL and PLATON'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device       'Bruker Smart APEX'
_diffrn_measurement_device_type  'CCD Area Detector'
_diffrn_measurement_method       'Omega Scan'
_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  0.0282
_diffrn_reflns_av_sigmaI/netI    0.0326
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            15654
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.18
_exptl_absorpt_coefficient_mu    0.221
_exptl_absorpt_correction_T_max  0.9921
_exptl_absorpt_correction_T_min  0.9705
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Bruker SADABS'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.276
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             1248
_exptl_crystal_size_max          0.14
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.345
_refine_diff_density_min         -0.273
_refine_diff_density_rms         0.069
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.03(11)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.053
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     365
_refine_ls_number_reflns         5415
_refine_ls_number_restraints     24
_refine_ls_restrained_S_all      1.100
_refine_ls_R_factor_all          0.0715
_refine_ls_R_factor_gt           0.0586
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0833P)^2^+0.7642P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1467
_refine_ls_wR_factor_ref         0.1546
_reflns_number_gt                4451
_reflns_number_total             5415
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2cc33235c.txt
_cod_data_source_block           C27H34N4O7S2Compound3a
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value '86-90 degree centigrade' was changed
to '361(2)' - it was converted from degrees Celsius(C) to Kelvins(K),
the average value was taken and precision was estimated.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P212121
_cod_database_code               7108235