Sodium Congener of the Classical Lithium Methylchromate Dimer: Synthetic, X-ray Crystallographic, and Magnetic Studies of Me8Cr2[Na(OEt2)]4
Ross Campbell; Luca M. Carrella; William Clegg; Robert E. Mulvey; Eva Rentschler; Stuart D. Robertson; Luca Russo; Inorganic Chemistry 50 (2011) 4656–4659; doi:10.1021/ic200471b

data_4325118
_publ_section_title
;
 Sodium Congener of the Classical Lithium Methylchromate Dimer: Synthetic,
 X-ray Crystallographic, and Magnetic Studies of Me8Cr2[Na(OEt2)]4
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              4656
_journal_page_last               4659
_journal_paper_doi               10.1021/ic200471b
_journal_volume                  50
_journal_year                    2011
_chemical_formula_moiety         'C24 H64 Cr2 Na4 O4'
_chemical_formula_sum            'C24 H64 Cr2 Na4 O4'
_chemical_formula_weight         612.71
_chemical_name_systematic
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 ?
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_space_group_IT_number           87
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  '-I 4'
_symmetry_space_group_name_H-M   'I 4/m'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   14.5304(7)
_cell_length_b                   14.5304(7)
_cell_length_c                   8.7463(14)
_cell_measurement_reflns_used    1110
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      29.58
_cell_measurement_theta_min      3.05
_cell_volume                     1846.6(3)
_computing_cell_refinement
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.66 (release 28-04-2010 CrysAlis171 .NET)
(compiled Apr 28 2010,14:27:37)
;
_computing_data_collection
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.66 (release 28-04-2010 CrysAlis171 .NET)
(compiled Apr 28 2010,14:27:37)
;
_computing_data_reduction
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.66 (release 28-04-2010 CrysAlis171 .NET)
(compiled Apr 28 2010,14:27:37)
;
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL and local programs'
_computing_structure_refinement  'Bruker SHELXTL'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      123(2)
_diffrn_detector_area_resol_mean 16.0727
_diffrn_measured_fraction_theta_full 0.977
_diffrn_measured_fraction_theta_max 0.977
_diffrn_measurement_device_type  'Oxford Diffraction Xcalibur diffractometer'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0279
_diffrn_reflns_av_sigmaI/netI    0.0413
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            2343
_diffrn_reflns_theta_full        25.02
_diffrn_reflns_theta_max         25.02
_diffrn_reflns_theta_min         3.91
_exptl_absorpt_coefficient_mu    0.657
_exptl_absorpt_correction_T_max  0.975
_exptl_absorpt_correction_T_min  0.880
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.66 (release 28-04-2010 CrysAlis171 .NET)
(compiled Apr 28 2010,14:27:37)
empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.102
_exptl_crystal_description       plate
_exptl_crystal_F_000             664
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.253
_refine_diff_density_min         -0.328
_refine_diff_density_rms         0.047
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.926
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     74
_refine_ls_number_reflns         859
_refine_ls_number_restraints     27
_refine_ls_restrained_S_all      0.946
_refine_ls_R_factor_all          0.0602
_refine_ls_R_factor_gt           0.0394
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0730P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1025
_refine_ls_wR_factor_ref         0.1091
_reflns_number_gt                629
_reflns_number_total             859
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ic200471b_si_002.cif
_cod_data_source_block           rem515mo
_cod_database_code               4325118
_computing_special_details
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TITL rem515mo in I4/m
CELL 0.71073  14.5304  14.5304   8.7463  90.000  90.000  90.000
ZERR    2.00   0.0007   0.0007   0.0014   0.000   0.000   0.000
LATT  2
SYMM -X, -Y, Z
SYMM -Y, X, Z
SYMM Y, -X, Z
SFAC C H O NA CR
UNIT 48 128 8 8 4

TEMP -150
SIZE 0.20 0.16 0.04

L.S. 8
ACTA
BOND $H
FMAP 2
PLAN 10

rem DELU 0.005 C4 C5A C5B
rem SIMU 0.005 C4 C5A C5B
rem SADI 0.005 C4 C5A C4 C5B C2 C3
rem SADI O C5A O C5B O C3
rem SADI O C2 O C4

DELU C4 C5A C5B
SIMU C4 C5A C5B
SADI C4 C5A C4 C5B C2 C3
SADI O C5A O C5B O C3
SADI O C2 O C4

rem EXTI    0.000800
WGHT    0.073000
FVAR       0.54838   0.53345
CR    5    0.000000    0.000000    0.186555    10.25000    0.02882    0.02882 =
         0.06104    0.00000    0.00000    0.00000
NA    4   -0.134028    0.109392    0.000000    10.50000    0.03267    0.03234 =
         0.07503    0.00000    0.00000    0.00450
C1    1   -0.012244    0.148496    0.227996    11.00000    0.04367    0.03759 =
         0.07048   -0.00882    0.00011    0.00062
H1A   2    0.031539    0.187225    0.222599    11.00000    0.06152
H1B   2   -0.017305    0.138008    0.340105    11.00000    0.05589
H1C   2   -0.061461    0.183624    0.206719    11.00000    0.06221
O     3   -0.272148    0.194576    0.000000    10.50000    0.03073    0.06896 =
         0.08503    0.00000    0.00000    0.00274
C2    1   -0.272202    0.290691    0.000000    10.50000    0.07831    0.06467 =
         0.12707    0.00000    0.00000    0.04793
AFIX  23
H2A   2   -0.306607    0.311837   -0.091164    10.50000   -1.20000
H2B   2   -0.306607    0.311837    0.091164    10.50000   -1.20000
AFIX   0
C3    1   -0.187804    0.333354    0.000000    10.50000    0.07893    0.04497 =
         0.15473    0.00000    0.00000    0.01512
AFIX  33
H3A   2   -0.196427    0.400245    0.000000    10.50000   -1.50000
H3B   2   -0.153397    0.315121   -0.091486    10.50000   -1.50000
H3C   2   -0.153397    0.315121    0.091486    10.50000   -1.50000
AFIX   0
C4    1   -0.359512    0.155949    0.000000    10.50000    0.05687    0.12424 =
         0.18418    0.00000    0.00000   -0.01720
PART -1
AFIX  23
H4A   2   -0.403106    0.208231    0.004753    20.50000   -1.20000
H4B   2   -0.367529    0.127768   -0.102191    20.50000   -1.20000
AFIX  23
PART -2
H4C   2   -0.396212    0.189142    0.077806   -20.50000   -1.20000
H4D   2   -0.387628    0.169727   -0.100531   -20.50000   -1.20000
AFIX   0
PART -1
C5A   1   -0.389311    0.096162    0.096791    20.50000    0.08209    0.04761 =
         0.17468    0.01102   -0.05914   -0.04117
AFIX  33
H5A1  2   -0.453357    0.080701    0.072834    20.50000   -1.50000
H5A2  2   -0.385850    0.121802    0.200266    20.50000   -1.50000
H5A3  2   -0.351402    0.040492    0.090919    20.50000   -1.50000
AFIX   0
PART -2
C5B   1   -0.370493    0.068394    0.024849   -20.50000    0.05023    0.07529 =
         0.04785   -0.03023   -0.01220    0.01186
AFIX  33
H5B1  2   -0.436241    0.053423    0.022544   -20.50000   -1.50000
H5B2  2   -0.345100    0.052554    0.125260   -20.50000   -1.50000
H5B3  2   -0.338415    0.033227   -0.054531   -20.50000   -1.50000

HKLF 4

REM  rem515mo in I4/m
REM R1 =  0.0394 for    629 Fo > 4sig(Fo)  and  0.0602 for all    859 data
REM     74 parameters refined using     27 restraints

END

WGHT      0.0611      0.0000
REM Highest difference peak  0.253,  deepest hole -0.328,  1-sigma level  0.047
Q1    1  -0.3099  0.3249  0.0000  10.50000  0.05    0.25
Q2    1  -0.1186  0.3143  0.0000  10.50000  0.05    0.24
Q3    1  -0.2803  0.1414  0.0000  10.50000  0.05    0.22
Q4    1  -0.4123  0.1202  0.1139  11.00000  0.05    0.21
Q5    1  -0.3191  0.0354  0.0000  10.50000  0.05    0.18
Q6    1   0.0780  0.1853  0.2217  11.00000  0.05    0.17
Q7    1  -0.0173  0.0103  0.0000  10.50000  0.05    0.17
Q8    1  -0.2946  0.2429  0.0621  11.00000  0.05    0.16
Q9    1  -0.2416  0.2028  0.0505  11.00000  0.05    0.16
Q10   1  -0.0206  0.0993  0.1467  11.00000  0.05    0.15
;