Exploring the synthesis of infinite helical chains with 2-carboxycinnamic acid
Li, F.; Ma, Z.; Wang, Y.-L.; Cao, R.; Bi, W.-H.; Li, X.; CrystEngComm 7 (2005) 569–; doi:10.1039/b505920h

data_7216074
_publ_section_title
;
 Exploring the synthesis of infinite helical chains with 2-carboxycinnamic
 acid
;
_journal_issue                   92
_journal_name_full               CrystEngComm
_journal_page_first              569
_journal_paper_doi               10.1039/b505920h
_journal_volume                  7
_journal_year                    2005
_chemical_formula_sum            'C20 H18 Cd N2 O6'
_chemical_formula_weight         494.76
_chemical_name_systematic
;
?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_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                 95.179(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.973(2)
_cell_length_b                   13.598(3)
_cell_length_c                   15.883(4)
_cell_measurement_reflns_used    4781
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.4835
_cell_measurement_theta_min      3.1005
_cell_volume                     1930.1(8)
_computing_cell_refinement       'CrystalClear (Rigaku Corp., 2000)'
_computing_data_collection       'CrystalClear (Rigaku Corp., 2000)'
_computing_data_reduction        'CrystalClear (Rigaku Corp., 2000)'
_computing_molecular_graphics    'SHELXL-97 (Sheldrick, 1997)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.827
_diffrn_measured_fraction_theta_max 0.827
_diffrn_measurement_device_type
;
Mercury70 (2x2 bin mode)
;
_diffrn_measurement_method       dtprofit.ref
_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  0.0250
_diffrn_reflns_av_sigmaI/netI    0.0299
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -4
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            6957
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         3.10
_diffrn_standards_decay_%        none
_diffrn_standards_interval_count none
_diffrn_standards_interval_time  none
_diffrn_standards_number         none
_exptl_absorpt_coefficient_mu    1.172
_exptl_absorpt_correction_T_max  0.0000
_exptl_absorpt_correction_T_min  0.0000
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
empirical from equivalent reflections (XEMP in
SHELXTL; Siemens,1994)
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.703
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             992
_exptl_crystal_size_max          0.2000
_exptl_crystal_size_mid          0.2000
_exptl_crystal_size_min          0.1500
_refine_diff_density_max         1.233
_refine_diff_density_min         -0.462
_refine_diff_density_rms         0.086
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.008
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     278
_refine_ls_number_reflns         3667
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.008
_refine_ls_R_factor_all          0.0380
_refine_ls_R_factor_gt           0.0321
_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^)+(0.0380P)^2^+3.9546P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0747
_refine_ls_wR_factor_ref         0.0799
_reflns_number_gt                3295
_reflns_number_total             3667
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b505920h.txt
_cod_data_source_block           a
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_absorpt_correction_type' value 'Multi-scan' changed to
'multi-scan' according to
/usr/data/users/saulius/automatic-downloads/retrospective/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 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_cell_volume        1930.0(8)
_cod_original_sg_symbol_H-M      p2(1)/c
_cod_database_code               7216074