Phase transition sequences in tetramethylammonium tetrachlorometallates by X-ray diffraction and spectroscopic measurements.
Binns, Jack; McIntyre, Garry J.; Barreda-Argüeso, José A; González, Jesús; Aguado, Fernando; Rodríguez, Fernando; Valiente, Rafael; Parsons, Simon; Acta crystallographica Section B, Structural science, crystal engineering and materials 73 (2017) 844–855; doi:10.1107/S2052520617006412

data_2311727
_publ_section_title
;
 Phase transition sequences in tetramethylammonium tetrachlorometallates
 by X-ray diffraction and spectroscopic measurements.
;
_journal_issue                   'Pt 5'
_journal_name_full
'Acta crystallographica Section B, Structural science, crystal engineering and materials'
_journal_page_first              844
_journal_page_last               855
_journal_paper_doi               10.1107/S2052520617006412
_journal_volume                  73
_journal_year                    2017
_chemical_formula_moiety         'C4 H12 N1, Cl4 Ga1 '
_chemical_formula_sum            'C4 H12 Cl4 Ga N'
_chemical_formula_weight         285.68
_chemical_name_systematic        'tetramethylammonium tetrachlorogallate'
_space_group_IT_number           57
_space_group_name_Hall           '-P 2a 2ab'
_space_group_name_H-M_alt        'P b m a'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2a 2ab'
_symmetry_space_group_name_H-M   'P b m a'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_audit_creation_date             15-10-06
_audit_creation_method           CRYSTALS_ver_14.40
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   12.8736(3)
_cell_length_b                   14.1743(3)
_cell_length_c                   6.4043(2)
_cell_measurement_reflns_used    3059
_cell_measurement_temperature    249
_cell_measurement_theta_max      29
_cell_measurement_theta_min      3
_cell_volume                     1168.62(5)
_computing_cell_refinement       'CrysAlis, (Oxford Diffraction, 2002)'
_computing_data_collection       'SuperNova, (Oxford Diffraction, 2010)'
_computing_data_reduction        'CrysAlis, (Oxford Diffraction, 2002)'
_computing_molecular_graphics    'CAMERON (Watkin et al., 1996)'
_computing_publication_material  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_refinement  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      249
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device       Area
_diffrn_measurement_device_type  'Oxford Diffraction SuperNova'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.045
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -7
_diffrn_reflns_number            15621
_diffrn_reflns_theta_full        25.344
_diffrn_reflns_theta_max         25.344
_diffrn_reflns_theta_min         3.181
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    3.212
_exptl_absorpt_correction_T_max  0.73
_exptl_absorpt_correction_T_min  0.48
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrysAlis, (Oxford Diffraction, 2002)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.624
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             568
_exptl_crystal_size_max          0.150
_exptl_crystal_size_mid          0.120
_exptl_crystal_size_min          0.100
_refine_diff_density_max         1.18
_refine_diff_density_min         -0.62
_refine_ls_extinction_method     None
_refine_ls_goodness_of_fit_ref   1.0000
_refine_ls_hydrogen_treatment    noref
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1
_refine_ls_number_reflns         1108
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0543
_refine_ls_R_factor_gt           0.0510
_refine_ls_shift/su_max          0.0000327
_refine_ls_shift/su_mean         0.0000327
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
 Method, part 1, Chebychev polynomial, (Watkin, 1994, Prince, 1982) 
 [weight] = 1.0/[A~0~*T~0~(x)+A~1~*T~1~(x) ... +A~n-1~]*T~n-1~(x)] 
 where A~i~ are the Chebychev coefficients listed below and x= Fcalc/Fmax 
 Method = Robust Weighting (Prince, 1982) 
 W = [weight] * [1-(deltaF/6*sigmaF)^2^]^2^ 
 A~i~ are: 
 8.42 13.0 7.19 2.51 0.458 
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1055
_refine_ls_wR_factor_gt          0.1052
_refine_ls_wR_factor_ref         0.1055
_reflns_limit_h_max              15
_reflns_limit_h_min              0
_reflns_limit_k_max              16
_reflns_limit_k_min              0
_reflns_limit_l_max              7
_reflns_limit_l_min              0
_reflns_number_gt                1046
_reflns_number_total             1112
_reflns_threshold_expression     I>2.0\s(I)
_oxford_diffrn_Wilson_B_factor   0.00
_oxford_diffrn_Wilson_scale      0.00
_oxford_refine_ls_r_factor_ref   0.0543
_oxford_refine_ls_scale          0.15440(8)
_oxford_reflns_number_all        1108
_oxford_reflns_threshold_expression_ref I>0.0\s(I)
_oxford_structure_analysis_title 'SP3084_248_Pbma in Pbma'
_cod_data_source_file            fx5008sup1.cif
_cod_data_source_block           tcg_248
_cod_original_sg_symbol_H-M      'P b m a '
_cod_original_formula_sum        'C4 H12 Cl4 Ga1 N1'
_cod_database_code               2311727
_iucr_refine_instructions_details_constraints
;
FULL 
END                                                                             
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_iucr_refine_instructions_details_restraints
;
NO 
REM   HREST   START (DO NOT REMOVE THIS LINE) 
REM   HREST   END (DO NOT REMOVE THIS LINE) 
REM   DELU   START (DO NOT REMOVE THIS LINE) 
VIBR .0, 0.00200 = N(1) TO C(1,4) 
VIBR .0, 0.00200 = N(1) TO C(2,4) 
VIBR .0, 0.00200 = N(1) TO C(1) 
VIBR .0, 0.00200 = N(1) TO C(2) 
VIBR .0, 0.00500 = C(2,4) TO C(1,4) 
VIBR .0, 0.00500 = C(1) TO C(1,4) 
VIBR .0, 0.00500 = C(1) TO C(2,4) 
VIBR .0, 0.00500 = C(2) TO C(1,4) 
VIBR .0, 0.00500 = C(2) TO C(2,4) 
VIBR .0, 0.00500 = C(2) TO C(1) 
REM   DELU   END (DO NOT REMOVE THIS LINE) 
REM   THERMSIM   START (DO NOT REMOVE THIS LINE) 
U(IJ) .0, 0.04000 = N(1) TO C(1) 
U(IJ) .0, 0.04000 = N(1) TO C(2) 
REM   THERMSIM   END (DO NOT REMOVE THIS LINE) 
REM   SHIFTLIMIT   START (DO NOT REMOVE THIS LINE) 
REM   SHIFTLIMIT   END (DO NOT REMOVE THIS LINE) 
END                                                                             
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