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###                                                                        ###
###        Electronic paper (Acta Crystallographica Section E)             ###
###                                                                        ###
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#                                                                            #
# This CIF contains the data in a paper accepted for publication in Acta     #
# Crystallographica Section E. It conforms to the requirements of Notes      #
# for Authors for Section E, and has been peer reviewed under the auspices   #
# of the IUCr Commission on Journals.                                        #
#                                                                            #
# Full details of the Crystallographic Information File format               #
# are given in the paper "The Crystallographic Information File (CIF):       #
# a New Standard Archive File for Crystallography" by S. R. Hall, F. H.      #
# Allen and I. D. Brown [Acta Cryst. (1991), A47, 655-685].                  #
#                                                                            #
# The current version of the core CIF dictionary is obtainable from          #
# ftp://ftp.iucr.org/pub/cif_core.dic. The current version number is 2.1.    #
#                                                                            #
# Software is freely available for graphical display of the structure(s) in  #
# this CIF.  For information consult the CIF home page http://www.iucr.org/  #
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#                                                                            #
#            Copyright International Union of Crystallography                #
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##############################################################################
                                             
data_I
_audit_creation_method     SHELXL-97
_chemical_name_systematic
;
trans-2-(2-Naphthyl)-3-(phenylselenyl)tetrahydropyran
;
_chemical_name_common     ?
_chemical_formula_moiety     'C21 H20 O Se'
_chemical_formula_sum     'C21 H20 O Se'
_chemical_formula_iupac     'C21 H20 O Se'
_chemical_formula_weight     367.33
_symmetry_cell_setting     Orthorhombic
_symmetry_space_group_name_H-M     'P 21 21 21'
loop_
    _symmetry_equiv_pos_as_xyz
    'x, y, z'
    '-x+1/2, -y, z+1/2'
    '-x, y+1/2, -z+1/2'
    'x+1/2, -y+1/2, -z'
_cell_length_a     8.1766(2)
_cell_length_b     8.8854(2)
_cell_length_c     23.0888(3)
_cell_angle_alpha     90.00
_cell_angle_beta     90.00
_cell_angle_gamma     90.00
_cell_volume     1677.46(4)
_cell_formula_units_Z     4
_cell_measurement_reflns_used     8192
_cell_measurement_theta_min     2
_cell_measurement_theta_max     26
_cell_measurement_temperature     150(2)
_exptl_crystal_description     'Irregular fragment'
_exptl_crystal_colour     Colourless
_exptl_crystal_size_max     0.42
_exptl_crystal_size_mid     0.36
_exptl_crystal_size_min     0.18
_exptl_crystal_density_diffrn     1.455
_exptl_crystal_density_meas     ?
_exptl_crystal_density_method     'not measured'
_exptl_crystal_F_000     752
_exptl_absorpt_coefficient_mu     2.241
_exptl_absorpt_correction_type     'Multi-scan'
_exptl_absorpt_process_details     '(Blessing, 1995)'
_exptl_absorpt_correction_T_min     0.439
_exptl_absorpt_correction_T_max     0.667
_exptl_special_details
;
 ?
;
_diffrn_ambient_temperature     150(2)
_diffrn_radiation_type     MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_radiation_source     'fine-focus sealed tube'
_diffrn_radiation_monochromator     graphite
_diffrn_measurement_device_type     'Siemens SMART'
_diffrn_measurement_method     'Area-detector ω'
_diffrn_detector_area_resol_mean     ?
_diffrn_reflns_number     10162
_diffrn_reflns_av_R_equivalents     0.035
_diffrn_reflns_av_sigmaI/netI     0.041
_diffrn_reflns_theta_min     1.8
_diffrn_reflns_theta_max     26.4
_diffrn_reflns_theta_full     26.4
_diffrn_measured_fraction_theta_max     0.999
_diffrn_measured_fraction_theta_full     0.999
_diffrn_reflns_limit_h_min     -10
_diffrn_reflns_limit_h_max     10
_diffrn_reflns_limit_k_min     0
_diffrn_reflns_limit_k_max     11
_diffrn_reflns_limit_l_min     0
_diffrn_reflns_limit_l_max     28
_diffrn_standards_number     0
_diffrn_standards_interval_count     ?
_diffrn_standards_interval_time     ?
_diffrn_standards_decay_%     <2
_refine_special_details
;
 ?
;
_reflns_number_total     3416
_reflns_number_gt     3227
_reflns_threshold_expression     I>2σ(I)
_refine_ls_structure_factor_coef     Fsqd
_refine_ls_matrix_type     full
_refine_ls_R_factor_all     0.029
_refine_ls_R_factor_gt     0.026
_refine_ls_wR_factor_gt     0.064
_refine_ls_wR_factor_ref     0.065
_refine_ls_goodness_of_fit_ref     1.00
_refine_ls_restrained_S_all     1.00
_refine_ls_number_reflns     3416
_refine_ls_number_parameters     212
_refine_ls_number_restraints     0
_refine_ls_hydrogen_treatment     constr
_refine_ls_weighting_scheme     calc
_refine_ls_weighting_details
             'calc w = 1/[σ²(Fo²)+(0.0366P)²] where P = (Fo²+2Fc²)/3'
_atom_sites_solution_hydrogens     difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary     difmap
_refine_ls_shift/su_max     0.009
_refine_ls_shift/su_mean     0.001
_refine_diff_density_max     0.48
_refine_diff_density_min     -0.48
_refine_ls_extinction_method     none
_refine_ls_extinction_coef     ?
_refine_ls_abs_structure_details     'Flack (1983), 0000 Friedel pairs'
_refine_ls_abs_structure_Flack     0.013(8)
loop_
    _atom_type_symbol
    _atom_type_description
    _atom_type_scat_dispersion_real
    _atom_type_scat_dispersion_imag
    _atom_type_scat_source
    'C' 'C' 0.0033 0.0016
                         'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
    'H' 'H' 0.0000 0.0000
                         'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
    'O' 'O' 0.0106 0.0060
                         'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
    'Se' 'Se' -0.0929 2.2259
                         'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
_computing_data_collection     'SMART (Siemens, 1995)'
_computing_cell_refinement     'SMART'
_computing_data_reduction     'SAINT  (Siemens, 1995)'
_computing_structure_solution     'SHELXS Sheldrick, (1990)'
_computing_structure_refinement     'SHELXL97 Sheldrick, (1997)'
_computing_molecular_graphics     'SHELXTL (Siemens, 1994)'
_computing_publication_material     'SHELXL97'
loop_
    _atom_site_label
    _atom_site_fract_x
    _atom_site_fract_y
    _atom_site_fract_z
    _atom_site_U_iso_or_equiv
    _atom_site_adp_type
    _atom_site_calc_flag
    _atom_site_refinement_flags
    _atom_site_occupancy
    _atom_site_disorder_assembly
    _atom_site_disorder_group
    _atom_site_type_symbol
    Se 0.53216(3) 0.45318(3) 0.991097(10) 0.02935(8) Uani d . 1 . . Se
    O1 0.0954(2) 0.5363(2) 1.08227(6) 0.0303(4) Uani d . 1 . . O
    C2 0.2269(3) 0.5608(3) 1.04185(9) 0.0249(5) Uani d . 1 . . C
    H2A 0.2931 0.6492 1.0548 0.030 Uiso calc R 1 . . H
    C3 0.3368(3) 0.4208(2) 1.04006(10) 0.0243(5) Uani d . 1 . . C
    H3A 0.2730 0.3331 1.0250 0.029 Uiso calc R 1 . . H
    C4 0.4022(3) 0.3847(3) 1.10083(10) 0.0287(5) Uani d . 1 . . C
    H4A 0.4621 0.2879 1.1000 0.034 Uiso calc R 1 . . H
    H4B 0.4795 0.4643 1.1131 0.034 Uiso calc R 1 . . H
    C5 0.2610(3) 0.3748(3) 1.14411(10) 0.0345(6) Uani d . 1 . . C
    H5A 0.1942 0.2844 1.1358 0.041 Uiso calc R 1 . . H
    H5B 0.3050 0.3652 1.1839 0.041 Uiso calc R 1 . . H
    C6 0.1561(3) 0.5133(3) 1.13998(10) 0.0345(6) Uani d . 1 . . C
    H6A 0.0626 0.5037 1.1670 0.041 Uiso calc R 1 . . H
    H6B 0.2210 0.6022 1.1519 0.041 Uiso calc R 1 . . H
    C1' 0.2158(3) 0.7046(3) 0.94898(10) 0.0244(5) Uani d . 1 . . C
    H1C 0.304(4) 0.764(3) 0.9606(11) 0.029 Uiso d . 1 . . H
    C2' 0.1496(3) 0.5961(2) 0.98376(10) 0.0224(5) Uani d . 1 . . C
    C3' 0.0142(3) 0.5117(2) 0.96380(10) 0.0272(5) Uani d . 1 . . C
    H3C -0.0332 0.4374 0.9882 0.033 Uiso calc R 1 . . H
    C4' -0.0494(3) 0.5360(3) 0.90961(10) 0.0307(5) Uani d . 1 . . C
    H4C -0.1412 0.4791 0.8971 0.037 Uiso calc R 1 . . H
    C4A' 0.0196(3) 0.6447(3) 0.87196(9) 0.0263(5) Uani d . 1 . . C
    C5' -0.0381(4) 0.6711(3) 0.81465(10) 0.0360(6) Uani d . 1 . . C
    H5C -0.1289 0.6151 0.8006 0.043 Uiso calc R 1 . . H
    C6' 0.0337(4) 0.7746(3) 0.77958(10) 0.0397(6) Uani d . 1 . . C
    H6C -0.0078 0.7912 0.7417 0.048 Uiso calc R 1 . . H
    C7' 0.1699(4) 0.8577(3) 0.79936(12) 0.0403(6) Uani d . 1 . . C
    H7C 0.2217 0.9277 0.7742 0.048 Uiso calc R 1 . . H
    C8' 0.2280(3) 0.8379(3) 0.85465(11) 0.0340(6) Uani d . 1 . . C
    H8C 0.3176 0.8966 0.8679 0.041 Uiso calc R 1 . . H
    C8A' 0.1553(3) 0.7309(3) 0.89209(10) 0.0245(5) Uani d . 1 . . C
    C1" 0.4527(3) 0.4219(2) 0.91339(9) 0.0260(5) Uani d . 1 . . C
    C2" 0.3573(3) 0.2987(3) 0.89836(11) 0.0306(5) Uani d . 1 . . C
    H2D 0.3239 0.2288 0.9272 0.037 Uiso calc R 1 . . H
    C3" 0.3111(3) 0.2780(3) 0.84111(11) 0.0353(6) Uani d . 1 . . C
    H3D 0.2435 0.1952 0.8309 0.042 Uiso calc R 1 . . H
    C4" 0.3631(4) 0.3777(4) 0.79867(12) 0.0401(6) Uani d . 1 . . C
    H4D 0.3333 0.3616 0.7594 0.048 Uiso calc R 1 . . H
    C5" 0.4573(4) 0.4996(3) 0.81336(11) 0.0393(6) Uani d . 1 . . C
    H5D 0.4923 0.5680 0.7843 0.047 Uiso calc R 1 . . H
    C6" 0.5020(3) 0.5233(3) 0.87088(11) 0.0328(6) Uani d . 1 . . C
    H6D 0.5660 0.6085 0.8811 0.039 Uiso calc R 1 . . H
_geom_special_details
;
 ?
;
loop_
    _geom_bond_atom_site_label_1
    _geom_bond_atom_site_label_2
    _geom_bond_site_symmetry_2
    _geom_bond_distance
    _geom_bond_publ_flag
    Se C1" . 1.928(2) y
    Se C3 . 1.978(2) y
    O1 C2 . 1.440(3) y
    O1 C6 . 1.436(3) y
    C2 C2' . 1.516(3) y
    C2 C3 . 1.535(3) y
    C2 H2A . 1.0000 ?
    C3 C4 . 1.535(3) y
    C3 H3A . 1.0000 ?
    C4 C5 . 1.529(4) y
    C4 H4A . 0.9900 ?
    C4 H4B . 0.9900 ?
    C5 C6 . 1.504(4) y
    C5 H5A . 0.9900 ?
    C5 H5B . 0.9900 ?
    C6 H6A . 0.9900 ?
    C6 H6B . 0.9900 ?
    C1' C2' . 1.366(3) ?
    C1' C8A' . 1.423(3) ?
    C1' H1C . 0.93(3) ?
    C2' C3' . 1.415(3) ?
    C3' C4' . 1.372(3) ?
    C3' H3C . 0.9500 ?
    C4' C4A' . 1.417(3) ?
    C4' H4C . 0.9500 ?
    C4A' C5' . 1.424(3) ?
    C4A' C8A' . 1.426(3) ?
    C5' C6' . 1.359(4) ?
    C5' H5C . 0.9500 ?
    C6' C7' . 1.412(5) ?
    C6' H6C . 0.9500 ?
    C7' C8' . 1.373(4) ?
    C7' H7C . 0.9500 ?
    C8' C8A' . 1.416(3) ?
    C8' H8C . 0.9500 ?
    C1" C2" . 1.388(3) ?
    C1" C6" . 1.391(3) ?
    C2" C3" . 1.387(4) ?
    C2" H2D . 0.9500 ?
    C3" C4" . 1.388(4) ?
    C3" H3D . 0.9500 ?
    C4" C5" . 1.372(4) ?
    C4" H4D . 0.9500 ?
    C5" C6" . 1.393(4) ?
    C5" H5D . 0.9500 ?
    C6" H6D . 0.9500 ?
loop_
    _geom_angle_atom_site_label_1
    _geom_angle_atom_site_label_2
    _geom_angle_atom_site_label_3
    _geom_angle_site_symmetry_1
    _geom_angle_site_symmetry_3
    _geom_angle
    _geom_angle_publ_flag
    C1" Se C3 . . 103.81(10) y
    C2 O1 C6 . . 111.39(18) y
    O1 C2 C2' . . 107.06(17) y
    O1 C2 C3 . . 109.40(18) y
    C2' C2 C3 . . 112.84(17) y
    O1 C2 H2A . . 109.2 ?
    C2' C2 H2A . . 109.2 ?
    C3 C2 H2A . . 109.2 ?
    C2 C3 C4 . . 110.40(19) y
    C2 C3 Se . . 111.73(14) y
    C4 C3 Se . . 105.73(16) y
    C2 C3 H3A . . 109.6 ?
    C4 C3 H3A . . 109.6 ?
    Se C3 H3A . . 109.6 ?
    C5 C4 C3 . . 110.2(2) y
    C5 C4 H4A . . 109.6 ?
    C3 C4 H4A . . 109.6 ?
    C5 C4 H4B . . 109.6 ?
    C3 C4 H4B . . 109.6 ?
    H4A C4 H4B . . 108.1 ?
    C6 C5 C4 . . 110.0(2) y
    C6 C5 H5A . . 109.7 ?
    C4 C5 H5A . . 109.7 ?
    C6 C5 H5B . . 109.7 ?
    C4 C5 H5B . . 109.7 ?
    H5A C5 H5B . . 108.2 ?
    O1 C6 C5 . . 111.9(2) y
    O1 C6 H6A . . 109.2 ?
    C5 C6 H6A . . 109.2 ?
    O1 C6 H6B . . 109.2 ?
    C5 C6 H6B . . 109.2 ?
    H6A C6 H6B . . 107.9 ?
    C2' C1' C8A' . . 121.3(2) ?
    C2' C1' H1C . . 122.5(16) ?
    C8A' C1' H1C . . 116.2(16) ?
    C1' C2' C3' . . 119.5(2) ?
    C1' C2' C2 . . 120.1(2) ?
    C3' C2' C2 . . 120.3(2) ?
    C4' C3' C2' . . 120.6(2) ?
    C4' C3' H3C . . 119.7 ?
    C2' C3' H3C . . 119.7 ?
    C3' C4' C4A' . . 121.1(2) ?
    C3' C4' H4C . . 119.5 ?
    C4A' C4' H4C . . 119.5 ?
    C4' C4A' C5' . . 123.4(2) ?
    C4' C4A' C8A' . . 118.4(2) ?
    C5' C4A' C8A' . . 118.2(2) ?
    C6' C5' C4A' . . 121.4(3) ?
    C6' C5' H5C . . 119.3 ?
    C4A' C5' H5C . . 119.3 ?
    C5' C6' C7' . . 120.1(2) ?
    C5' C6' H6C . . 119.9 ?
    C7' C6' H6C . . 119.9 ?
    C8' C7' C6' . . 120.4(3) ?
    C8' C7' H7C . . 119.8 ?
    C6' C7' H7C . . 119.8 ?
    C7' C8' C8A' . . 120.5(3) ?
    C7' C8' H8C . . 119.7 ?
    C8A' C8' H8C . . 119.7 ?
    C8' C8A' C1' . . 121.8(2) ?
    C8' C8A' C4A' . . 119.2(2) ?
    C1' C8A' C4A' . . 118.9(2) ?
    C2" C1" C6" . . 119.8(2) ?
    C2" C1" Se . . 122.37(18) ?
    C6" C1" Se . . 117.73(18) ?
    C3" C2" C1" . . 119.7(2) ?
    C3" C2" H2D . . 120.1 ?
    C1" C2" H2D . . 120.1 ?
    C2" C3" C4" . . 120.3(3) ?
    C2" C3" H3D . . 119.8 ?
    C4" C3" H3D . . 119.8 ?
    C5" C4" C3" . . 120.1(3) ?
    C5" C4" H4D . . 120.0 ?
    C3" C4" H4D . . 120.0 ?
    C4" C5" C6" . . 120.2(2) ?
    C4" C5" H5D . . 119.9 ?
    C6" C5" H5D . . 119.9 ?
    C1" C6" C5" . . 119.9(2) ?
    C1" C6" H6D . . 120.0 ?
    C5" C6" H6D . . 120.0 ?
    C1" Se C3 . . 103.81(10) y
    C2 O1 C6 . . 111.39(18) y
    O1 C2 C2' . . 107.06(17) y
    O1 C2 C3 . . 109.40(18) y
    C2' C2 C3 . . 112.84(17) y
    C2 C3 C4 . . 110.40(19) y
    C2 C3 Se . . 111.73(14) y
    C4 C3 Se . . 105.73(16) y
    C5 C4 C3 . . 110.2(2) y
    C6 C5 C4 . . 110.0(2) y
    O1 C6 C5 . . 111.9(2) y
    C2' C1' C8A' . . 121.3(2) ?
    C1' C2' C3' . . 119.5(2) ?
    C1' C2' C2 . . 120.1(2) ?
    C3' C2' C2 . . 120.3(2) ?
    C4' C3' C2' . . 120.6(2) ?
    C3' C4' C4A' . . 121.1(2) ?
    C4' C4A' C5' . . 123.4(2) ?
    C4' C4A' C8A' . . 118.4(2) ?
    C5' C4A' C8A' . . 118.2(2) ?
    C6' C5' C4A' . . 121.4(3) ?
    C5' C6' C7' . . 120.1(2) ?
    C8' C7' C6' . . 120.4(3) ?
    C7' C8' C8A' . . 120.5(3) ?
    C8' C8A' C1' . . 121.8(2) ?
    C8' C8A' C4A' . . 119.2(2) ?
    C1' C8A' C4A' . . 118.9(2) ?
    C2" C1" C6" . . 119.8(2) ?
    C2" C1" Se . . 122.37(18) ?
    C6" C1" Se . . 117.73(18) ?
    C3" C2" C1" . . 119.7(2) ?
    C2" C3" C4" . . 120.3(3) ?
    C5" C4" C3" . . 120.1(3) ?
    C4" C5" C6" . . 120.2(2) ?
    C1" C6" C5" . . 119.9(2) ?
loop_
    _geom_torsion_atom_site_label_1
    _geom_torsion_atom_site_label_2
    _geom_torsion_atom_site_label_3
    _geom_torsion_atom_site_label_4
    _geom_torsion_site_symmetry_1
    _geom_torsion_site_symmetry_2
    _geom_torsion_site_symmetry_3
    _geom_torsion_site_symmetry_4
    _geom_torsion
    _geom_torsion_publ_flag
    C6 O1 C2 C2' . . . . -175.51(19) ?
    C6 O1 C2 C3 . . . . 61.9(2) ?
    O1 C2 C3 C4 . . . . -57.2(2) ?
    C2' C2 C3 C4 . . . . -176.2(2) ?
    O1 C2 C3 Se . . . . -174.55(14) ?
    C2' C2 C3 Se . . . . 66.4(2) ?
    C1" Se C3 C2 . . . . -80.82(16) ?
    C1" Se C3 C4 . . . . 159.04(15) ?
    C2 C3 C4 C5 . . . . 52.7(3) ?
    Se C3 C4 C5 . . . . 173.71(17) ?
    C3 C4 C5 C6 . . . . -51.7(3) ?
    C2 O1 C6 C5 . . . . -62.6(3) ?
    C4 C5 C6 O1 . . . . 56.5(3) ?
    C8A' C1' C2' C3' . . . . -2.4(3) ?
    C8A' C1' C2' C2 . . . . 174.2(2) ?
    O1 C2 C2' C1' . . . . 140.2(2) ?
    C3 C2 C2' C1' . . . . -99.4(2) ?
    O1 C2 C2' C3' . . . . -43.2(3) ?
    C3 C2 C2' C3' . . . . 77.2(2) ?
    C1' C2' C3' C4' . . . . 1.1(3) ?
    C2 C2' C3' C4' . . . . -175.5(2) ?
    C2' C3' C4' C4A' . . . . 0.8(3) ?
    C3' C4' C4A' C5' . . . . 177.9(2) ?
    C3' C4' C4A' C8A' . . . . -1.2(3) ?
    C4' C4A' C5' C6' . . . . -178.7(2) ?
    C8A' C4A' C5' C6' . . . . 0.4(3) ?
    C4A' C5' C6' C7' . . . . 0.8(4) ?
    C5' C6' C7' C8' . . . . -1.9(4) ?
    C6' C7' C8' C8A' . . . . 1.9(4) ?
    C7' C8' C8A' C1' . . . . 178.0(2) ?
    C7' C8' C8A' C4A' . . . . -0.7(4) ?
    C2' C1' C8A' C8' . . . . -176.9(2) ?
    C2' C1' C8A' C4A' . . . . 1.9(3) ?
    C4' C4A' C8A' C8' . . . . 178.7(2) ?
    C5' C4A' C8A' C8' . . . . -0.5(3) ?
    C4' C4A' C8A' C1' . . . . 0.0(3) ?
    C5' C4A' C8A' C1' . . . . -179.2(2) ?
    C3 Se C1" C2" . . . . -47.6(2) ?
    C3 Se C1" C6" . . . . 136.17(18) ?
    C6" C1" C2" C3" . . . . -0.4(4) ?
    Se C1" C2" C3" . . . . -176.6(2) ?
    C1" C2" C3" C4" . . . . 1.6(4) ?
    C2" C3" C4" C5" . . . . -1.6(4) ?
    C3" C4" C5" C6" . . . . 0.3(4) ?
    C2" C1" C6" C5" . . . . -0.8(4) ?
    Se C1" C6" C5" . . . . 175.5(2) ?
    C4" C5" C6" C1" . . . . 0.9(4) ?
data_global
_journal_date_recd_electronic     2002-07-11
_journal_date_accepted     2002-07-23
_journal_name_full     'Acta Crystallographica, Section E'
_journal_year     2002
_journal_volume     58
_journal_issue      8
_journal_page_first     o931
_journal_page_last     o932
_journal_paper_category     EO
_publ_contact_author_name     'Dr C. E. F. Rickard'
_publ_contact_author_address
;
Department of Chemistry
University of Auckland
Private Bag 92019
Auckland
New Zealand
;
_publ_contact_author_email     c.rickard@auckland.ac.nz
_publ_contact_author_fax     '64 9 373 7422'
_publ_contact_author_phone     '64 9 373 7999'
_publ_section_title
;
trans-2-(2-Naphthyl)-3-(phenylselenyl)tetrahydropyran
;
loop_
    _publ_author_name
    _publ_author_address
    'Rickard, Clifton E. F.'
;    Department of Chemistry
     University of Auckland
     Private Bag 92019
     Auckland
     New Zealand
;
    'Brimble, Margaret A.'
;    Department of Chemistry
     University of Auckland
     Private Bag 92019
     Auckland
     New Zealand
;
    'Pavia, Gabrielle'
;    Department of Chemistry
     University of Auckland
     Private Bag 92019
     Auckland
     New Zealand
;
    'Stevenson, Ralph J.'
;    Department of Chemistry
     University of Auckland
     Private Bag 92019
     Auckland
     New Zealand
;
