Isomorphic supramolecular structures via one-dimensional hydrogen bonding motifs in crystals of chiral difluorolactates, trichlorolactates and trifluorolactates
Takahashi, Satoshi; Jukurogi, Tatsuya; Katagiri, Toshimasa; Uneyama, Kenji; CrystEngComm 8 (2006) 320–; doi:10.1039/b600325g

data_7203263
_publ_section_title
;
 Isomorphic supramolecular structures via one-dimensional hydrogen
 bonding motifs in crystals of chiral difluorolactates,
 trichlorolactates and trifluorolactates
;
_journal_issue                   4
_journal_name_full               CrystEngComm
_journal_page_first              320
_journal_paper_doi               10.1039/b600325g
_journal_volume                  8
_journal_year                    2006
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C12 H18 F4 O6'
_chemical_formula_sum            'C12 H18 F4 O6'
_chemical_formula_weight         334.26
_chemical_melting_point          356
_chemical_name_common            Hexamethylene-(R,R)-bis(3,3-difluorolactate)
_chemical_optical_rotation       '[\a]^25^~D~= -5.72 (c= 0.81, acetone)'
_space_group_IT_number           18
_symmetry_cell_setting           orthorhombic
_symmetry_Int_Tables_number      18
_symmetry_space_group_name_Hall  'P 2 2ab'
_symmetry_space_group_name_H-M   'P 21 21 2'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2005-12-8 CheckCIF
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   18.8223(6)
_cell_length_b                   5.14670(10)
_cell_length_c                   7.7739(3)
_cell_measurement_reflns_used    7965
_cell_measurement_temperature    120(1)
_cell_measurement_theta_max      54.9
_cell_measurement_theta_min      2.2
_cell_volume                     753.08(4)
_computing_cell_refinement       'PAPID-AUTO (Rigaku)'
_computing_data_collection       'RAPID-AUTO (Rigaku)'
_computing_data_reduction        'teXsan Ver. 1.11 (MSC)'
_computing_molecular_graphics    'Mercury Ver. 1.4 (Bruno et al., 2002)'
_computing_publication_material  'WinGX Ver. 1.7 (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR97 (Altomare et al., 1999)'
_diffrn_ambient_temperature      120(1)
_diffrn_detector_area_resol_mean 10
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Rigaku R-AXIS IV imaging plate'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Rigaku rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.055
_diffrn_reflns_av_sigmaI/netI    0.0842
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            5840
_diffrn_reflns_theta_full        27.47
_diffrn_reflns_theta_max         27.47
_diffrn_reflns_theta_min         3.40
_exptl_absorpt_coefficient_mu    0.146
_exptl_absorpt_correction_T_max  0.992
_exptl_absorpt_correction_T_min  0.694
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; '(HIGASHI, T. (1995). Abscor - Empirical Absorption Correction
based on Fourier Series Approximation. Rigaku Corporation, Tokyo, Japan.)'
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.474
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             348
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.07
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.264
_refine_diff_density_min         -0.204
_refine_diff_density_rms         0.060
_refine_ls_abs_structure_details
; The absolute configuration was assigned to agree with
that of its precursor (R)-difluorolactic acid at the chiral centre C2.
This compound has no atom heavier than Si and analyzed by
Mo radiation so that Flack parameter is not listed.
Freidel pairs were merged before refinement.
;
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.216
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     103
_refine_ls_number_reflns         1043
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.216
_refine_ls_R_factor_all          0.0554
_refine_ls_R_factor_gt           0.0473
_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^)+(0.0417P)^2^+0.0446P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0969
_refine_ls_wR_factor_ref         0.0994
_reflns_number_gt                945
_reflns_number_total             1043
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b600325g.txt
_cod_data_source_block           (R,R)-5a
_cod_database_code               7203263