Synthesis, characterization and phase transitions of the inorganic‒organic layered perovskite-type hybrids [(CnH2n+1NH3)2PbI4] (n = 12, 14, 16 and 18)
Billing, David G.; Lemmerer, Andreas; New Journal of Chemistry 32 (2008) 1736–; doi:10.1039/b805417g

data_7051996
_publ_section_title
;
 Synthesis, characterization and phase transitions of the
 inorganic--organic layered perovskite-type hybrids [(CnH2n+1NH3)2PbI4]
 (n = 12, 14, 16 and 18)
;
_journal_issue                   10
_journal_name_full               'New Journal of Chemistry'
_journal_page_first              1736
_journal_paper_doi               10.1039/b805417g
_journal_volume                  32
_journal_year                    2008
_chemical_formula_moiety         '2(C18 H40 N), I4 Pb'
_chemical_formula_sum            'C36 H80 I4 N2 Pb'
_chemical_formula_weight         1255.81
_chemical_name_systematic
;
bis(octadecylammonium)tetraiodoplumbate(II)
;
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.3
_audit_creation_date             2007-08-31T14:43:58-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.78250(10)
_cell_length_b                   8.54010(10)
_cell_length_c                   64.4472(11)
_cell_measurement_reflns_used    5836
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      25.04
_cell_measurement_theta_min      3
_cell_volume                     4833.76(11)
_computing_cell_refinement       'SAINT-Plus (Bruker, 2004)'
_computing_data_collection       'APEX2 (Bruker, 2005)'
_computing_data_reduction        'SAINT-Plus and XPREP (Bruker 2004)'
_computing_molecular_graphics
;
Ortep-3 for Windows (Farrugia, 1997) and DIAMOND (Brandenburg, 1999)
;
_computing_publication_material
;
WinGX publication routines (Farrugia, 1999) and PLATON (Spek, 2002)
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997a)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker APEX II CCD area detector'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0754
_diffrn_reflns_av_unetI/netI     0.0485
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       78
_diffrn_reflns_limit_l_min       -56
_diffrn_reflns_number            21829
_diffrn_reflns_theta_full        25.5
_diffrn_reflns_theta_max         25.5
_diffrn_reflns_theta_min         1.9
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    6.068
_exptl_absorpt_correction_T_max  0.938
_exptl_absorpt_correction_T_min  0.1906
_exptl_absorpt_correction_type   integration
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.726
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             2416
_exptl_crystal_size_max          0.48
_exptl_crystal_size_mid          0.27
_exptl_crystal_size_min          0.01
_refine_diff_density_max         1.318
_refine_diff_density_min         -1.991
_refine_diff_density_rms         0.157
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.141
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     196
_refine_ls_number_reflns         4500
_refine_ls_number_restraints     175
_refine_ls_restrained_S_all      1.208
_refine_ls_R_factor_all          0.0737
_refine_ls_R_factor_gt           0.0556
_refine_ls_shift/su_max          0.035
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0404P)^2^+37.0220P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1281
_refine_ls_wR_factor_ref         0.1346
_reflns_number_gt                3430
_reflns_number_total             4500
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b805417g.txt
_cod_data_source_block           4a
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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      Pbca
_cod_database_code               7051996