Structural diversity in two-dimensional coordination polymers constructed from simple building-blocks; a rare example of coordination polymer polymorphs structurally characterised from multiple crystals.
Barnett, Sarah A.; Blake, Alexander J.; Champness, Neil R.; Wilson, Claire; Dalton transactions (Cambridge, England : 2003)  (2005) 3852–3861; doi:10.1039/b509294a

data_7008820
_publ_section_title
;
 Structural diversity in two-dimensional coordination polymers
 constructed from simple building-blocks; a rare example of
 coordination polymer polymorphs structurally characterised from
 multiple crystals.
;
_journal_issue                   24
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              3852
_journal_page_last               3861
_journal_paper_doi               10.1039/b509294a
_journal_year                    2005
_chemical_formula_moiety         '[Cd(NO3)2(N2C4H4)]'
_chemical_formula_sum            'C4 H4 Cd N4 O6'
_chemical_formula_weight         316.51
_chemical_name_common            'Cadmium (ii) bis-nitrate-bis-pyrazine'
_chemical_name_systematic
;
Cadmium (II) bis-nitrate-bis-pyrazine
;
_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                 118.209(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.1541(12)
_cell_length_b                   9.356(2)
_cell_length_c                   14.2864(18)
_cell_measurement_reflns_used    1773
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      28.2
_cell_measurement_theta_min      2.7
_cell_volume                     842.7(3)
_computing_cell_refinement       'Bruker SAINT version 6.02a (Bruker, 2000)'
_computing_data_collection       'Bruker SMART version 5.624 (Bruker, 2001)'
_computing_data_reduction
;
Bruker SAINT; Bruker SHELXTL (Bruker, 1997; GEMINI, autoindexing program for
twinned crystals, version 1.02)'
;
_computing_publication_material  'SHELXL-97; PLATON (Spek, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.900
_diffrn_measured_fraction_theta_max 0.900
_diffrn_measurement_device_type  'Bruker SMART1000 CCD area detector'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.035
_diffrn_reflns_av_sigmaI/netI    0.0371
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            4426
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.71
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    2.612
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.822
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS version 2.03 (Bruker, 2001)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    2.495
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             608
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.13
_exptl_crystal_size_min          0.04
_refine_diff_density_max         3.47
_refine_diff_density_min         -1.93
_refine_diff_density_rms         0.210
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.018
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     136
_refine_ls_number_reflns         1332
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.018
_refine_ls_R_factor_all          0.0535
_refine_ls_R_factor_gt           0.0439
_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^)+(0.0953P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1143
_refine_ls_wR_factor_ref         0.1233
_reflns_number_gt                1097
_reflns_number_total             1332
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            b509294a.txt
_cod_data_source_block           Compound_3a
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7008820