Towards a temperature-guided molecular switch: an unusual reversible low-temperature polymorphic phase transition in a conformationally locked environment.
Mehta, Goverdhan; Sen, Saikat; Chemical communications (Cambridge, England)  (2009) 5981–5983; doi:10.1039/b905651c

data_7104919
_publ_section_title
;
 Towards a temperature-guided molecular switch: an unusual reversible
 low-temperature polymorphic phase transition in a conformationally
 locked environment.
;
_journal_issue                   40
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              5981
_journal_page_last               5983
_journal_paper_doi               10.1039/b905651c
_journal_year                    2009
_chemical_compound_source        'see text'
_chemical_formula_iupac          'C18 H26 O10'
_chemical_formula_moiety         'C18 H26 O10'
_chemical_formula_structural     'C18 H26 O10'
_chemical_formula_sum            'C18 H26 O10'
_chemical_formula_weight         402.39
_chemical_name_systematic
;
(all trans)-3,6,7-tri(acetyloxy)-4a,8a-dihydroxyperhydro-2-naphthalenyl acetate
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      15
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             'Mar 02 19:52:37 2009'
_audit_creation_method           'PLATON <TABLE ACC> option'
_cell_angle_alpha                90
_cell_angle_beta                 105.664(5)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   21.433(7)
_cell_length_b                   5.7126(18)
_cell_length_c                   16.720(5)
_cell_measurement_reflns_used    698
_cell_measurement_temperature    291(2)
_cell_measurement_theta_max      23.43
_cell_measurement_theta_min      2.76
_cell_volume                     1971.1(11)
_computing_cell_refinement       'SMART (Bruker, 1998)'
_computing_data_collection       'SMART (Bruker, 1998)'
_computing_data_reduction        'SAINT (Bruker, 1998)'
_computing_molecular_graphics
'Ortep-3 for Windows (Farrugia, 1997) and CAMERON (Watkin et al., 1993)'
_computing_publication_material  'PLATON (Spek, 2003)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      291(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoKa
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0176
_diffrn_reflns_av_sigmaI/netI    0.0162
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            6929
_diffrn_reflns_reduction_process
;
;
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.35
_diffrn_reflns_theta_min         2.53
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.111
_exptl_absorpt_correction_T_max  0.9738
_exptl_absorpt_correction_T_min  0.9439
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 1997)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.356
_exptl_crystal_density_method    'Not Measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             856
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.24
_refine_diff_density_max         0.213
_refine_diff_density_min         -0.182
_refine_diff_density_rms         0.041
_refine_ls_extinction_method     none
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_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     139
_refine_ls_number_reflns         1800
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.052
_refine_ls_R_factor_all          0.0642
_refine_ls_R_factor_gt           0.0514
_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^)+(0.0753P)^2^+1.3499P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1402
_refine_ls_wR_factor_ref         0.1518
_reflns_number_gt                1419
_reflns_number_total             1800
_reflns_threshold_expression     I>2sigma(I)
_cod_data_source_file            b905651c.txt
_cod_data_source_block           tetraacetate_alpha_form_RT
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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      'C 2/c'
_cod_database_code               7104919