Unravelling the chemical basis of the bathochromic shift in the lobster carapace; new crystal structures of unbound astaxanthin, canthaxanthin and zeaxanthin
Bartalucci, Giuditta; Coppin, Jennifer; Fisher, Stuart; Hall, Gillian; Helliwell, John R.; Helliwell, Madeleine; Liaaen-Jensen, Synnøve; Acta Crystallographica Section B 63 (2007) 328–337; doi:10.1107/S0108768106052633

data_2102771
_publ_section_title
;
 Unravelling the chemical basis of the bathochromic shift in the
 lobster carapace; new crystal structures of unbound astaxanthin,
 canthaxanthin and zeaxanthin
;
_journal_coeditor_code           BM5041
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              328
_journal_page_last               337
_journal_paper_doi               10.1107/S0108768106052633
_journal_volume                  63
_journal_year                    2007
_chemical_formula_moiety         'C40 H52 O4, 2(C H Cl3)'
_chemical_formula_sum            'C42 H54 Cl6 O4'
_chemical_formula_weight         835.55
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                79.036(2)
_cell_angle_beta                 80.499(3)
_cell_angle_gamma                82.506(2)
_cell_formula_units_Z            1
_cell_length_a                   5.9588(8)
_cell_length_b                   11.8583(16)
_cell_length_c                   15.647(2)
_cell_measurement_reflns_used    1032
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      21.89
_cell_measurement_theta_min      2.39
_cell_volume                     1065.0(2)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.970
_diffrn_measured_fraction_theta_max 0.970
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0605
_diffrn_reflns_av_sigmaI/netI    0.1406
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            7182
_diffrn_reflns_theta_full        25.03
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         1.76
_exptl_absorpt_coefficient_mu    0.443
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.303
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             440
_exptl_crystal_size_max          0.65
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.540
_refine_diff_density_min         -0.570
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.799
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     259
_refine_ls_number_reflns         3634
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      0.801
_refine_ls_R_factor_all          0.1140
_refine_ls_R_factor_gt           0.0477
_refine_ls_shift/su_max          0.005
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0281P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0810
_refine_ls_wR_factor_ref         0.0932
_reflns_number_gt                1776
_reflns_number_total             3634
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            bm5041.cif
_cod_data_source_block           axt-CL
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
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 

The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        1065.0(3)
_cod_original_sg_symbol_Hall     -P1
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               2102771