#------------------------------------------------------------------------------
#$Date: 2012-02-03 19:16:24 +0200 (Fri, 03 Feb 2012) $
#$Revision: 32112 $
#$URL: file:///home/coder/svn-repositories/cod/cif/2/00/36/2003634.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/. The original data for this entry
# were provided by IUCr Journals, http://journals.iucr.org/.
#
# The file may be used within the scientific community so long as
# proper attribution is given to the journal article from which the
# data were obtained.
#
data_2003634
loop_
_publ_author_name
'Brown, S. D.'
'Burgess, J.'
'Fawcett, J.'
'Parsons, S. A.'
'Russell, D. R.'
'Waltham, E.'
_publ_section_title
;
 Three Polymorphic Forms of 2-Ethyl-3-hydroxy-4-pyranone (Ethyl Maltol)
;
_journal_issue                   7
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              1335
_journal_page_last               1338
_journal_volume                  51
_journal_year                    1995
_chemical_compound_source        'see text'
_chemical_formula_sum            'C7 H8 O3'
_chemical_formula_weight         140.1
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_type_scat_source           IntTabC
_cell_angle_alpha                90
_cell_angle_beta                 95.23(1)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   4.867(2)
_cell_length_b                   6.895(2)
_cell_length_c                   20.200(6)
_cell_measurement_reflns_used    30
_cell_measurement_temperature    293
_cell_measurement_theta_max      12.5
_cell_measurement_theta_min      6.9
_cell_volume                     675.0(4)
_diffrn_measurement_device       'Siemens P4'
_diffrn_measurement_method       \w
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0389
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -1
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -1
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            1760
_diffrn_reflns_theta_max         25
_diffrn_standards_decay_%        1
_diffrn_standards_interval_count 100
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.108
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.379
_exptl_crystal_description       block
_exptl_crystal_size_max          0.78
_exptl_crystal_size_mid          0.34
_exptl_crystal_size_min          0.17
_refine_diff_density_max         0.30
_refine_diff_density_min         0.24
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_obs   1.83
_refine_ls_hydrogen_treatment    noref
_refine_ls_number_parameters     91
_refine_ls_number_reflns         715
_refine_ls_R_factor_obs          0.077
_refine_ls_shift/esd_max         0.005
_refine_ls_structure_factor_coef F
_refine_ls_weighting_scheme      1/[\s^2^(F)+0.0015F^2^]
_refine_ls_wR_factor_obs         0.104
_reflns_number_observed          715
_reflns_number_total             1100
_reflns_observed_criterion       F>4\s(F)
_[local]_cod_data_source_file    as1151.cif
_[local]_cod_data_source_block   as1151a
_[local]_cod_cif_authors_sg_H-M  'P 21/n'
_cod_database_code               2003634
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
1/2+x,1/2-y,1/2+z
-x,-y,-z
1/2-x,1/2+y,1/2-z
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
O(1) .0753(9) .1371(5) .3406(2) 0.063(1)
O(2) .1946(8) .4397(5) .2573(2) 0.062(1)
O(3) -.3677(8) .5139(5) .3918(2) 0.062(1)
C(1) -.1863(16) .2443(9) .5070(2) 0.079(2)
C(2) -.3150(14) .1974(8) .4379(2) 0.064(2)
C(3) -.2333(2) .3404(7) .3875(2) 0.052(2)
C(4) -.0470(12) .3134(7) .3428(2) 0.049(2)
C(5) .0206(11) .4667(7) .2986(2) 0.048(2)
C(6) -.1167(12) .6457(7) .3070(2) 0.053(2)
C(7) -.3051(14) .6586(8) .3510(2) 0.064(2)
H(1) .1681 .1198 .3018 0.080
H(1A) -.2434 .1481 .5372 0.080
H(1B) .0112 .2439 .5079 0.080
H(1C) -.2477 .3698 .5200 0.080
H(2A) -.5124 .1953 .4375 0.080
H(2B) -.2561 .0707 .4255 0.080
H(6A) -.0754 .7569 .2811 0.080
H(7B) -.4039 .7784 .3537 0.080
loop_
_geom_angle_atom_site_label_1
_geom_angle_atom_site_label_2
_geom_angle_atom_site_label_3
_geom_angle
C(3) O(3) C(7) 118.2(4)
C(1) C(2) C(3) 111.9(5)
O(3) C(3) C(2) 112.0(4)
O(3) C(3) C(4) 121.1(4)
C(2) C(3) C(4) 126.9(5)
O(1) C(4) C(3) 118.0(4)
O(1) C(4) C(5) 120.8(4)
C(3) C(4) C(5) 121.3(4)
O(2) C(5) C(4) 120.6(4)
O(2) C(5) C(6) 124.1(4)
C(4) C(5) C(6) 115.2(4)
C(5) C(6) C(7) 119.7(5)
O(3) C(7) C(6) 124.4(5)
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
O(1) C(4) . 1.356(6) yes
O(2) C(5) . 1.256(6) yes
O(3) C(3) . 1.370(6) yes
O(3) C(7) . 1.346(6) yes
C(1) C(2) . 1.512(7) yes
C(2) C(3) . 1.497(7) yes
C(3) C(4) . 1.349(7) yes
C(4) C(5) . 1.441(6) yes
C(5) C(6) . 1.421(7) yes
C(6) C(7) . 1.337(8) yes
O(1) O(2) 4_545 2.724(4) yes