IR spectroscopy as a probe for C–H⋯X hydrogen bonded supramolecular synthons
Saha, Subhankar; Rajput, Lalit; Joseph, Sumy; Mishra, Manish Kumar; Ganguly, Somnath; Desiraju, Gautam R.; CrystEngComm 17 (2015) 1273–; doi:10.1039/C4CE02034K

data_7218967
_publ_section_title
;
 IR spectroscopy as a probe for C--H&#x22EF;X hydrogen bonded
 supramolecular synthons
;
_journal_issue                   6
_journal_name_full               CrystEngComm
_journal_page_first              1273
_journal_paper_doi               10.1039/C4CE02034K
_journal_volume                  17
_journal_year                    2015
_chemical_formula_sum            'C8 H7 N O4'
_chemical_formula_weight         181.15
_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
;
2014-09-12 deposited with the CCDC.
2014-11-26 downloaded from the CCDC.
;
_cell_angle_alpha                94.52
_cell_angle_beta                 97.04
_cell_angle_gamma                117.68
_cell_formula_units_Z            4
_cell_length_a                   7.463
_cell_length_b                   7.747
_cell_length_c                   15.435
_cell_measurement_reflns_used    1926
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      33.8
_cell_measurement_theta_min      2.7
_cell_volume                     774.890
_computing_cell_refinement
;
CrystalClear-SM Expert 2.0 rc14 (Rigaku, 2009)
;
_computing_data_collection
;
CrystalClear-SM Expert 2.0 rc14 (Rigaku, 2009)
;
_computing_data_reduction
;
CrystalClear-SM Expert 2.0 rc14 (Rigaku, 2009)
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXL-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 13.6612
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device
;
XtaLABmini: Fixed Chi 2 circle
;
_diffrn_measurement_device_type
;
Rigaku Mercury375R (2x2 bin mode)
;
_diffrn_measurement_method       'profile data from \w-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  0.0597
_diffrn_reflns_av_sigmaI/netI    0.0576
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            6992
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         1.35
_exptl_absorpt_coefficient_mu    0.124
_exptl_absorpt_correction_T_max  0.9756
_exptl_absorpt_correction_T_min  0.9744
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Jacobson, R. (1998) Private communication'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.553
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             330
_exptl_crystal_size_max          0.21
_exptl_crystal_size_mid          0.21
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.552
_refine_diff_density_min         -0.404
_refine_diff_density_rms         0.103
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.974
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     237
_refine_ls_number_reflns         3029
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.974
_refine_ls_R_factor_all          0.0997
_refine_ls_R_factor_gt           0.0755
_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^)+(0.1997P)^2^+0.2384P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2310
_refine_ls_wR_factor_ref         0.2758
_reflns_number_gt                2216
_reflns_number_total             3029
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            c4ce02034k2.cif
_cod_data_source_block           added_by_encifer
_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 2935 2014-11-11 08:27:57Z andrius 

 Adding full bibliography for 7218966--7218974.cif.
;
_cod_original_cell_volume        774.8
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7218967