Molecularly Tailored Nickel Precursor and Support Yield a Stable Methane Dry Reforming Catalyst with Superior Metal Utilization.
Margossian, Tigran; Larmier, Kim; Kim, Sung Min; Krumeich, Frank; Fedorov, Alexey; Chen, Peter; Müller, Christoph R; Copéret, Christophe; Journal of the American Chemical Society  (2017) –; doi:10.1021/jacs.7b01625

data_4126025
_publ_section_title
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 Molecularly Tailored Nickel Precursor and Support Yield a Stable Methane
 Dry Reforming Catalyst with Superior Metal Utilization.
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_paper_doi               10.1021/jacs.7b01625
_journal_year                    2017
_chemical_formula_moiety         'C16 H38 N4 Ni2 O9, H2 O'
_chemical_formula_sum            'C16 H40 N4 Ni2 O10'
_chemical_formula_weight         565.94
_chemical_name_systematic        1
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     dual
_audit_creation_date             2016-12-13
_audit_creation_method
;
Olex2 1.2
(compiled 2016.11.07 svn.r3352 for OlexSys, GUI svn.r5261)
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.5693(10)
_cell_length_b                   11.1146(11)
_cell_length_c                   21.504(2)
_cell_measurement_reflns_used    9925
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.30
_cell_measurement_theta_min      2.64
_cell_volume                     2526.2(4)
_computing_cell_refinement       'SAINT v8.34A (Bruker, 2013)'
_computing_data_reduction        'SAINT v8.34A (Bruker, 2013)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector                 'Bruker APEX2 area detector'
_diffrn_detector_area_resol_mean 7.9
_diffrn_detector_type            'CCD area detector'
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device       'three-circle diffractometer'
_diffrn_measurement_device_type  'Bruker SMART APEX2 area detector'
_diffrn_measurement_method       '\w and \f scans'
_diffrn_radiation_monochromator  'mirror optics'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0644
_diffrn_reflns_av_unetI/netI     0.0359
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            54357
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        26.000
_diffrn_reflns_theta_max         28.336
_diffrn_reflns_theta_min         2.636
_diffrn_source                   'microfocus sealed X-ray tube'
_diffrn_source_type              'Incoatec I\ms'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    1.544
_exptl_absorpt_correction_T_max  0.7457
_exptl_absorpt_correction_T_min  0.6556
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2012/1 (Bruker,2012) was used for absorption correction.
wR2(int) was 0.0692 before and 0.0646 after correction.
The Ratio of minimum to maximum transmission is 0.8792.
The \l/2 correction factor is 0.0015.
;
_exptl_crystal_colour            'clear light blue'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   light
_exptl_crystal_colour_primary    blue
_exptl_crystal_density_diffrn    1.488
_exptl_crystal_description       cube
_exptl_crystal_F_000             1200
_exptl_crystal_preparation       'reaction of Ni formiates with tmeda in water'
_exptl_crystal_recrystallization_method
'crystallized from a saturated solution in toluene at -40 degrees Celsius'
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.280
_refine_diff_density_min         -0.414
_refine_diff_density_rms         0.066
_refine_ls_abs_structure_details
;
 Refined as an inversion twin.
;
_refine_ls_abs_structure_Flack   0.379(12)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.060
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     304
_refine_ls_number_reflns         6274
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.060
_refine_ls_R_factor_all          0.0380
_refine_ls_R_factor_gt           0.0286
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0217P)^2^+0.7434P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0528
_refine_ls_wR_factor_ref         0.0553
_reflns_Friedel_coverage         0.778
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.997
_reflns_number_gt                5629
_reflns_number_total             6274
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja7b01625_si_002.cif
_cod_data_source_block           1
_cod_database_code               4126025
_olex2_refinement_description
;
1. Twinned data refinement
 Scales: 0.621(12) 0.379(12)
2. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups, All O(H,H) groups
3.a Free rotating group:
 O4(H4A,H4B), O10(H10D,H10E)
3.b Secondary CH2 refined with riding coordinates:
 C8(H8A,H8B), C7(H7A,H7B), C13(H13A,H13B), C14(H14A,H14B)
3.c Aromatic/amide H refined with riding coordinates:
 C2(H2), C4(H4), C1(H1), C3(H3)
3.d Idealised Me refined as rotating group:
 C12(H12A,H12B,H12C), C9(H9A,H9B,H9C), C10(H10A,H10B,H10C), C5(H5A,H5B,H5C),
 C6(H6A,H6B,H6C), C15(H15A,H15B,H15C), C11(H11A,H11B,H11C), C16(H16A,H16B,H16C)
;
_shelx_shelxl_version_number     2014/7
_olex2_exptl_crystal_mounting_method 'mounted in paratone oil'
_olex2_submission_special_instructions 'No special instructions were received'