Carboxylic acid functionalized ortho-linked oxacalix[2]benzene[2]pyrazine: synthesis, structure, hydrogen bond and metal directed self-assembly.
Kong, Ling-Wei; Ma, Ming-Liang; Wu, Liang-Chun; Zhao, Xiao-Li; Guo, Fang; Jiang, Biao; Wen, Ke; Dalton transactions (Cambridge, England : 2003) 41 (2012) 5625–5633; doi:10.1039/c2dt11283c

data_7018779
_publ_section_title
;
 Carboxylic acid functionalized ortho-linked
 oxacalix[2]benzene[2]pyrazine: synthesis, structure, hydrogen bond and
 metal directed self-assembly.
;
_journal_issue                   18
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              5625
_journal_page_last               5633
_journal_paper_doi               10.1039/c2dt11283c
_journal_volume                  41
_journal_year                    2012
_chemical_formula_sum            'C22 H12 N4 O8'
_chemical_formula_weight         460.35
_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
_cell_angle_alpha                98.8300(10)
_cell_angle_beta                 104.4450(10)
_cell_angle_gamma                92.6660(10)
_cell_formula_units_Z            4
_cell_length_a                   10.7260(2)
_cell_length_b                   11.7585(2)
_cell_length_c                   16.2804(2)
_cell_measurement_reflns_used    7925
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      28.47
_cell_measurement_theta_min      2.62
_cell_volume                     1957.10(6)
_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, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.966
_diffrn_measured_fraction_theta_max 0.966
_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  0.0200
_diffrn_reflns_av_sigmaI/netI    0.0225
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            18915
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.97
_exptl_absorpt_coefficient_mu    0.122
_exptl_absorpt_correction_T_max  0.9570
_exptl_absorpt_correction_T_min  0.9391
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Bruker SAINT (SADABS)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.562
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             944
_exptl_crystal_size_max          0.52
_exptl_crystal_size_mid          0.50
_exptl_crystal_size_min          0.36
_refine_diff_density_max         0.517
_refine_diff_density_min         -0.485
_refine_diff_density_rms         0.043
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.027
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     621
_refine_ls_number_reflns         6671
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.027
_refine_ls_R_factor_all          0.0474
_refine_ls_R_factor_gt           0.0364
_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^)+(0.0565P)^2^+0.7372P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0988
_refine_ls_wR_factor_ref         0.1079
_reflns_number_gt                5401
_reflns_number_total             6671
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2dt11283c.txt
_cod_data_source_block           z_1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        1957.10(5)
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7018779