data_1100068
loop_
_publ_author_name
_publ_author_address
'(The late) Marten G. Barker'
;
School of Chemistry
University of Nottingham
Nottingham
NG7 2RD
;
'Francesconi, M. Grazia '
;
School of Chemistry
University of Nottingham
Nottingham
NG7 2RD
;
' Shutt, Thomas H. '
;
School of Chemistry
University of Nottingham
Nottingham
NG7 2RD
;
'Claire Wilson'
;
School of Chemistry
University of Nottingham
Nottingham
NG7 2RD
;
_publ_contact_author_address
;
School of Chemistry
University of Nottingham
Nottingham
NG7 2RD
;
_publ_contact_author_email       claire.wilson@nott.ac.uk
_publ_contact_author_fax         +44-115-951-3563
_publ_contact_author_name        'Claire Wilson'
_publ_contact_author_phone       +44-115-951-3047
_publ_contact_letter
;
We would like this submission to be considered for publication in Acta
Crystallographic section E. We are submitting a second closely related
structure at the same time, that of Ba4OI6, and would be grateful if the
two could be handled together and if accepted published together. We also
ask that, if accepted, the two papers can be cross referenced as indicated
in the text.
;
_publ_requested_category         ei
_publ_requested_journal          'Acta Crystallographica Section E'
_publ_section_abstract
;
Strontium oxide iodide, Sr~4~OI~6~, has been prepared by a solid
 state reaction
and shown to be isotructural with A~4~OCl~6~ where A is Ba or Sr and with
Ba~4~OI~6~.
;
_publ_section_comment
;
Alkaline earth oxide chlorides and oxide bromides, of general formula
A~4~OX~6~ (A = alkaline earth; X=Cl^-^, Br^-^) are known for their
luminescence
properties, when the alkaline earth site is doped with small amounts of
Eu^2+^ or Pb^2+^ (Schipper et al, 1992). This family has now been extended to
the strontium oxide iodide compounds Sr~4~OI~6~. Sr~4~OI~6~ was prepared
by a solid state reaction and is isostructural with Sr~4~OCl~6~
(Hagemann et al, 1996)and Ba~4~OCl~6~ (von Bergenhoff & Goost, 1970)
 and Ba~4~OI~6~ (Barker et al, 2001). The oxygen is
four-coordinated by Sr cations, the iodine is four- and five-coordinated
by Sr cations and the Sr is eight-coordinated by one oxygen and seven
iodine anions at one site and seven coordinated by one oxygen and six
iodine anions at the other.
;
_publ_section_references
;
Altomare, A., Burla, M.C., Camalli, M., Cascarano, G, Giacovazzo, C.,
Guagliardi, A., Moliterni, A.G.G., Polidori, G. & Spagna, R. (1999).
SIR99,J. Appl. Cryst. 32, 115-119.

Barker, M. G. , Francesconi, M. G., & Wilson, C. (2001)
submitted to Acta Cryst. section E.

Bergenhoff, Von G. & Goost, L., (1970). Acta Cryst. B26, 19.

Bruker (1996). SADABS. Program for applying absorption correections
to area detector data. Bruker AXS, Inc., Madison, Wisconsin, USA.


Bruker (1998). SMART Area-Detector Software Package. Version 5.054.
Bruker AXS, Inc., Madison, Wisconsin, USA.

Bruker (1999). SAINT frame integration software. Version 6.01.
Bruker AXS, Inc., Madison, Wisconsin, USA.

Dowty, E. (1998). ATOMS. Version 4.1. Shape Software, 521 Hidden
Valley Road, Kingsport, TN 37663, USA.

Farrugia, L.J. (1999). J. Appl. Cryst. 32, 837-838.

Hagemann, H., Kubel, F. & Bill, H. (1996). Eur. J. Solid State Inorg.
Chem. 33, 1101-1109.

Schipper, W. J., Vroon Z. A. E. P., Blasse G. & Schleid, T. (1992). Chem.
Mater. 4, 688-692.

Sheldrick, G.M.(1997). SHELXL97, Univ. of G\"ottingen, Germany.

Spek, A.L. (2001). PLATON, program for the automated analysis of
molecular geometry. Univ of Utrecht, The Netherlands.
;
_publ_section_title              ' Strontium Oxide Iodide'
_chemical_formula_moiety         '6(I), O, 4(Sr)'
_chemical_formula_sum            'I6 O Sr4'
_chemical_formula_weight         1127.88
_chemical_melting_point          ?
_chemical_name_common            'strontium oxide iodide'
_chemical_name_systematic
;
 ?
;
_symmetry_cell_setting           hexagonal
_symmetry_space_group_name_H-M   P63mc
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.000(0)
_cell_angle_beta                 90.000(0)
_cell_angle_gamma                120.000(0)
_cell_formula_units_Z            2
_cell_length_a                   10.747(1)
_cell_length_b                   10.747(1)
_cell_length_c                   7.8678(9)
_cell_measurement_reflns_used    841
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.58
_cell_measurement_theta_min      5.9
_cell_volume                     787.0(3)
_computing_cell_refinement       'Bruker SAINT version 6.02a (Bruker, 2000)'
_computing_data_collection       'Bruker SMART version 5.054 (Bruker, 1998)'
_computing_data_reduction        'Bruker SAINT; Bruker SHELXTL (Bruker, 1997)'
_computing_molecular_graphics    'ATOMS (Dowty, 1998)'
_computing_publication_material  'SHELXL-97; PLATON (Spek, 2000)'
_computing_structure_refinement
'SHELXL-97 (Sheldrick, 1997); WINGX (Farrugia, 1999)'
_computing_structure_solution    'SIR97, (Altomare et al, 1999)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean ?
_diffrn_measured_fraction_theta_full 0.944
_diffrn_measured_fraction_theta_max 0.944
_diffrn_measurement_device_type  'Bruker SMART1000 CCD area detector'
_diffrn_measurement_method       omega
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.054
_diffrn_reflns_av_sigmaI/netI    0.000
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       4
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            3527
_diffrn_reflns_theta_full        28.97
_diffrn_reflns_theta_max         27.58
_diffrn_reflns_theta_min         5.9
_diffrn_standards_decay_%        none
_diffrn_standards_interval_count ?
_diffrn_standards_interval_time  ?
_diffrn_standards_number         ?
_exptl_absorpt_coefficient_mu    25.213
_exptl_absorpt_correction_T_max  0.365
_exptl_absorpt_correction_T_min  0.272
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, Bruker (1999)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    4.760
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             956
_exptl_crystal_size_max          0.05
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.04
_exptl_crystal_thermal_history
'heated at 1000C for 24 hours; cooled to room temperature at 1C/hour'
_exptl_special_details
;
SrO and SrI2 powders were mixed in stoichiometric proportions and placed in a
nickel crucible. The mixture was then heated at 1000C for 24 hours in a
silica tube, under flowing nitrogen. The product was cooled to room
temperature at 1C/hour.
;
_geom_special_details
;
 All esds (except the esd in the dihedral angle between two l.s. planes)
 are estimated using the full covariance matrix.  The cell esds are taken
 into account individually in the estimation of esds in distances, angles
 and torsion angles; correlations between esds in cell parameters are only
 used when they are defined by crystal symmetry.  An approximate (isotropic)
 treatment of cell esds is used for estimating esds involving l.s. planes.
;
_refine_diff_density_max         1.271
_refine_diff_density_min         -0.986
_refine_diff_density_rms         0.210
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.064(18)
_refine_ls_extinction_coef       ?
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.937
_refine_ls_matrix_type           full
_refine_ls_number_parameters     25
_refine_ls_number_reflns         721
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.936
_refine_ls_R_factor_all          0.0429
_refine_ls_R_factor_gt           0.0297
_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^)+(0.0206P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0522
_refine_ls_wR_factor_ref         0.0548
_refine_special_details
;
 Refinement of F^2^ against ALL reflections.  The weighted R-factor wR and
 goodness of fit S are based on F^2^, conventional R-factors R are based
 on F, with F set to zero for negative F^2^. The threshold expression of
 F^2^ > 2sigma(F^2^) is used only for calculating R-factors(gt) etc. and is
 not relevant to the choice of reflections for refinement.  R-factors based
 on F^2^ are statistically about twice as large as those based on F, and R-
 factors based on ALL data will be even larger.
;
_reflns_number_gt                586
_reflns_number_total             776
_reflns_threshold_expression     >2sigma(I)
#BEGIN Tags that were not found in dictionaries:
_publ_figure_captions
;
[001] projection of the Sr~4~OI~6~ structure showing the I^-^ anions (blue)
and the O-Sr tetrahedra
;
#END Tags that were not found in dictionaries
loop_
_atom_type_symbol
_atom_type_description
_atom_type_scat_dispersion_real
_atom_type_scat_dispersion_imag
_atom_type_scat_source
O O 0.0106 0.0060 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
Sr Sr -1.5307 3.2498 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
I I -0.4742 1.8119 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
loop_
_symmetry_equiv_pos_as_xyz
'x, y, z'
'-x, -y, z+1/2'
'-y, x-y, z'
'-x+y, -x, z'
'x-y, x, z+1/2'
'y, -x+y, z+1/2'
'-x+y, y, z'
'x, x-y, z'
'-y, -x, z'
'y, x, z+1/2'
'-x, -x+y, z+1/2'
'x-y, -y, z+1/2'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
_atom_site_adp_type
_atom_site_occupancy
_atom_site_symmetry_multiplicity
_atom_site_calc_flag
_atom_site_refinement_flags
_atom_site_disorder_assembly
_atom_site_disorder_group
I1 I 0.25533(9) 0.12766(5) 0.36865(10) 0.0175(2) Uani 1 2 d S . .
I2 I 0.46542(5) 0.53458(5) 0.17690(10) 0.0174(2) Uani 1 2 d S . .
Sr1 Sr 0.21157(7) 0.42313(14) 0.48599(16) 0.0172(3) Uani 1 2 d S . .
Sr2 Sr 0.3333 0.6667 0.8847(3) 0.0290(6) Uani 1 6 d S . .
O1 O 0.3333 0.6667 0.584(3) 0.031(5) Uani 1 6 d S . .
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_23
_atom_site_aniso_U_13
_atom_site_aniso_U_12
I1 0.0195(5) 0.0166(3) 0.0174(5) 0.0004(2) 0.0008(5) 0.0098(2)
I2 0.0187(3) 0.0187(3) 0.0129(4) -0.0015(2) 0.0015(2) 0.0078(4)
Sr1 0.0181(5) 0.0200(7) 0.0142(7) -0.0008(6) -0.0004(3) 0.0100(4)
Sr2 0.0391(10) 0.0391(10) 0.0088(12) 0.000 0.000 0.0196(5)
O1 0.027(7) 0.027(7) 0.038(12) 0.000 0.000 0.014(4)
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_distance
_geom_bond_site_symmetry_2
_geom_bond_publ_flag
I1 Sr1 3.392(2) 6_554 ?
I1 Sr1 3.5567(19) . ?
I1 Sr1 3.5567(19) 4 ?
I1 Sr2 3.830(2) 2_664 ?
I2 Sr2 3.366(2) 1_554 ?
I2 Sr1 3.3947(18) 3_665 ?
I2 Sr1 3.3947(18) . ?
I2 Sr1 3.5967(17) 6_554 ?
I2 Sr1 3.5967(17) 2_664 ?
Sr1 O1 2.393(6) . ?
Sr1 I1 3.392(2) 5 ?
Sr1 I2 3.3947(18) 4_565 ?
Sr1 I1 3.5567(19) 3 ?
Sr1 I2 3.5967(17) 2_665 ?
Sr1 I2 3.5967(17) 5 ?
Sr1 Sr2 3.870(3) . ?
Sr1 Sr1 3.926(3) 3_665 ?
Sr1 Sr1 3.926(3) 4_565 ?
Sr2 O1 2.37(2) . ?
Sr2 I2 3.366(2) 3_666 ?
Sr2 I2 3.366(2) 4_566 ?
Sr2 I2 3.366(2) 1_556 ?
Sr2 I1 3.830(2) 6_565 ?
Sr2 I1 3.830(2) 5 ?
Sr2 I1 3.830(2) 2_665 ?
Sr2 Sr1 3.870(3) 4_565 ?
Sr2 Sr1 3.870(3) 3_665 ?
O1 Sr1 2.393(6) 4_565 ?
O1 Sr1 2.393(6) 3_665 ?
loop_
_geom_angle_atom_site_label_1
_geom_angle_atom_site_label_2
_geom_angle_atom_site_label_3
_geom_angle
_geom_angle_site_symmetry_1
_geom_angle_site_symmetry_3
_geom_angle_publ_flag
Sr1 I1 Sr1 106.45(2) 6_554 . ?
Sr1 I1 Sr1 106.45(2) 6_554 4 ?
Sr1 I1 Sr1 147.04(5) . 4 ?
Sr1 I1 Sr2 64.47(5) 6_554 2_664 ?
Sr1 I1 Sr2 96.08(2) . 2_664 ?
Sr1 I1 Sr2 96.08(2) 4 2_664 ?
Sr2 I2 Sr1 101.78(5) 1_554 3_665 ?
Sr2 I2 Sr1 101.78(5) 1_554 . ?
Sr1 I2 Sr1 70.65(6) 3_665 . ?
Sr2 I2 Sr1 104.20(5) 1_554 6_554 ?
Sr1 I2 Sr1 153.95(4) 3_665 6_554 ?
Sr1 I2 Sr1 105.50(4) . 6_554 ?
Sr2 I2 Sr1 104.20(5) 1_554 2_664 ?
Sr1 I2 Sr1 105.50(4) 3_665 2_664 ?
Sr1 I2 Sr1 153.95(4) . 2_664 ?
Sr1 I2 Sr1 66.15(4) 6_554 2_664 ?
O1 Sr1 I1 98.7(5) . 5 ?
O1 Sr1 I2 86.6(4) . 4_565 ?
I1 Sr1 I2 140.95(3) 5 4_565 ?
O1 Sr1 I2 86.6(4) . . ?
I1 Sr1 I2 140.95(3) 5 . ?
I2 Sr1 I2 77.69(5) 4_565 . ?
O1 Sr1 I1 144.645(17) . 3 ?
I1 Sr1 I1 82.78(4) 5 3 ?
I2 Sr1 I1 71.78(3) 4_565 3 ?
I2 Sr1 I1 114.41(5) . 3 ?
O1 Sr1 I1 144.645(18) . . ?
I1 Sr1 I1 82.78(4) 5 . ?
I2 Sr1 I1 114.41(5) 4_565 . ?
I2 Sr1 I1 71.78(3) . . ?
I1 Sr1 I1 70.71(3) 3 . ?
O1 Sr1 I2 76.25(17) . 2_665 ?
I1 Sr1 I2 71.32(3) 5 2_665 ?
I2 Sr1 I2 146.26(4) 4_565 2_665 ?
I2 Sr1 I2 72.54(4) . 2_665 ?
I1 Sr1 I2 135.64(4) 3 2_665 ?
I1 Sr1 I2 70.80(3) . 2_665 ?
O1 Sr1 I2 76.25(17) . 5 ?
I1 Sr1 I2 71.32(3) 5 5 ?
I2 Sr1 I2 72.54(4) 4_565 5 ?
I2 Sr1 I2 146.26(4) . 5 ?
I1 Sr1 I2 70.80(3) 3 5 ?
I1 Sr1 I2 135.64(4) . 5 ?
I2 Sr1 I2 128.84(6) 2_665 5 ?
O1 Sr1 Sr2 35.4(5) . . ?
I1 Sr1 Sr2 63.27(5) 5 . ?
I2 Sr1 Sr2 113.68(5) 4_565 . ?
I2 Sr1 Sr2 113.68(5) . . ?
I1 Sr1 Sr2 131.55(3) 3 . ?
I1 Sr1 Sr2 131.55(3) . . ?
I2 Sr1 Sr2 66.26(3) 2_665 . ?
I2 Sr1 Sr2 66.26(3) 5 . ?
O1 Sr1 Sr1 34.9(2) . 3_665 ?
I1 Sr1 Sr1 113.50(3) 5 3_665 ?
I2 Sr1 Sr1 92.81(2) 4_565 3_665 ?
I2 Sr1 Sr1 54.67(3) . 3_665 ?
I1 Sr1 Sr1 163.52(2) 3 3_665 ?
I1 Sr1 Sr1 112.351(18) . 3_665 ?
I2 Sr1 Sr1 56.92(2) 2_665 3_665 ?
I2 Sr1 Sr1 110.87(2) 5 3_665 ?
Sr2 Sr1 Sr1 59.52(3) . 3_665 ?
O1 Sr1 Sr1 34.9(2) . 4_565 ?
I1 Sr1 Sr1 113.50(3) 5 4_565 ?
I2 Sr1 Sr1 54.67(3) 4_565 4_565 ?
I2 Sr1 Sr1 92.81(2) . 4_565 ?
I1 Sr1 Sr1 112.351(18) 3 4_565 ?
I1 Sr1 Sr1 163.52(2) . 4_565 ?
I2 Sr1 Sr1 110.87(2) 2_665 4_565 ?
I2 Sr1 Sr1 56.92(2) 5 4_565 ?
Sr2 Sr1 Sr1 59.52(3) . 4_565 ?
Sr1 Sr1 Sr1 60.0 3_665 4_565 ?
O1 Sr2 I2 133.08(4) . 3_666 ?
O1 Sr2 I2 133.08(4) . 4_566 ?
I2 Sr2 I2 78.48(6) 3_666 4_566 ?
O1 Sr2 I2 133.08(4) . 1_556 ?
I2 Sr2 I2 78.48(6) 3_666 1_556 ?
I2 Sr2 I2 78.48(6) 4_566 1_556 ?
O1 Sr2 I1 88.11(4) . 6_565 ?
I2 Sr2 I1 69.97(2) 3_666 6_565 ?
I2 Sr2 I1 69.97(2) 4_566 6_565 ?
I2 Sr2 I1 138.80(8) 1_556 6_565 ?
O1 Sr2 I1 88.11(4) . 5 ?
I2 Sr2 I1 138.80(8) 3_666 5 ?
I2 Sr2 I1 69.97(2) 4_566 5 ?
I2 Sr2 I1 69.97(2) 1_556 5 ?
I1 Sr2 I1 119.893(5) 6_565 5 ?
O1 Sr2 I1 88.11(4) . 2_665 ?
I2 Sr2 I1 69.97(2) 3_666 2_665 ?
I2 Sr2 I1 138.80(8) 4_566 2_665 ?
I2 Sr2 I1 69.97(2) 1_556 2_665 ?
I1 Sr2 I1 119.893(5) 6_565 2_665 ?
I1 Sr2 I1 119.893(5) 5 2_665 ?
O1 Sr2 Sr1 35.85(4) . 4_565 ?
I2 Sr2 Sr1 109.86(4) 3_666 4_565 ?
I2 Sr2 Sr1 109.86(4) 4_566 4_565 ?
I2 Sr2 Sr1 168.93(6) 1_556 4_565 ?
I1 Sr2 Sr1 52.26(3) 6_565 4_565 ?
I1 Sr2 Sr1 105.43(5) 5 4_565 ?
I1 Sr2 Sr1 105.43(5) 2_665 4_565 ?
O1 Sr2 Sr1 35.85(4) . . ?
I2 Sr2 Sr1 168.93(6) 3_666 . ?
I2 Sr2 Sr1 109.86(4) 4_566 . ?
I2 Sr2 Sr1 109.86(4) 1_556 . ?
I1 Sr2 Sr1 105.43(5) 6_565 . ?
I1 Sr2 Sr1 52.26(3) 5 . ?
I1 Sr2 Sr1 105.43(5) 2_665 . ?
Sr1 Sr2 Sr1 60.96(6) 4_565 . ?
O1 Sr2 Sr1 35.85(4) . 3_665 ?
I2 Sr2 Sr1 109.86(4) 3_666 3_665 ?
I2 Sr2 Sr1 168.93(6) 4_566 3_665 ?
I2 Sr2 Sr1 109.86(4) 1_556 3_665 ?
I1 Sr2 Sr1 105.43(5) 6_565 3_665 ?
I1 Sr2 Sr1 105.43(5) 5 3_665 ?
I1 Sr2 Sr1 52.26(3) 2_665 3_665 ?
Sr1 Sr2 Sr1 60.96(6) 4_565 3_665 ?
Sr1 Sr2 Sr1 60.96(6) . 3_665 ?
Sr2 O1 Sr1 108.7(5) . 4_565 ?
Sr2 O1 Sr1 108.7(5) . . ?
Sr1 O1 Sr1 110.2(4) 4_565 . ?
Sr2 O1 Sr1 108.7(5) . 3_665 ?
Sr1 O1 Sr1 110.2(4) 4_565 3_665 ?
Sr1 O1 Sr1 110.2(4) . 3_665 ?
