#------------------------------------------------------------------------------ #$Date: 2011-09-10 06:16:28 +0300 (Sat, 10 Sep 2011) $ #$Revision: 25271 $ #$URL: file:///home/coder/svn-repositories/cod/cif/2/2008110.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_2008110 loop_ _publ_author_name 'Plenio, H.' 'Diodone, R.' _publ_section_title ; A cylindrical macrocycle with two diaza-18-crown-6 macrocycles encapsulating two silver cations ; _journal_issue 1 _journal_name_full 'Acta Crystallographica Section C' _journal_page_first IUC9800081 _journal_volume 55 _journal_year 1999 _chemical_formula_iupac '[Ag2 (C40 H62 Cl2 N4 O8)](C F3 S O3)2' _chemical_formula_sum 'C42 H62 Ag2 Cl2 F6 N4 O14 S2' _chemical_formula_weight 1311.72 _chemical_name_common '(ClN2O4)2 - 2AgCF3SO3' _chemical_name_systematic ; \m-[35,44-dichloro-6,9,23,26,38,41,47,50-octaoxa-3,12,20,29-tetraaza- pentacyclo[29.8^3,12^.8^20,29^.3^1,31^.1^1,31^.1^14,18^]dopentaconta -14,16,18(44),31,33,1(35)-hexene]disilver(I) bis(triflate) ; _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' _audit_creation_method SHELXL-97 _cell_angle_alpha 90.00 _cell_angle_beta 91.37(3) _cell_angle_gamma 90.00 _cell_formula_units_Z 2 _cell_length_a 11.150(2) _cell_length_b 9.028(2) _cell_length_c 25.637(5) _cell_measurement_reflns_used 25 _cell_measurement_temperature 293(2) _cell_measurement_theta_max 18.3 _cell_measurement_theta_min 2.3 _cell_volume 2579.9(9) _computing_cell_refinement 'Turbomole Enraf-Nonius' _computing_data_collection 'Turbomole Enraf-Nonius' _computing_data_reduction 'CADFOR and CADSEX (Keller, 1993)' _computing_publication_material 'CIFTAB (Sheldrick, 1997)' _computing_structure_refinement 'SHELX97 (Sheldrick, 1997)' _computing_structure_solution 'SHELX97 (Sheldrick, 1997)' _diffrn_ambient_temperature 293(2) _diffrn_measured_fraction_theta_full 0.933 _diffrn_measured_fraction_theta_max 0.933 _diffrn_measurement_device_type 'Enraf Nonius CAD-4' _diffrn_measurement_method \w-2\q _diffrn_radiation_monochromator graphite _diffrn_radiation_source 'fine-focus sealed tube' _diffrn_radiation_type 'Mo K\a' _diffrn_radiation_wavelength 0.71069 _diffrn_reflns_av_R_equivalents 0.010 _diffrn_reflns_av_sigmaI/netI 0.014 _diffrn_reflns_limit_h_max 13 _diffrn_reflns_limit_h_min -13 _diffrn_reflns_limit_k_max 0 _diffrn_reflns_limit_k_min -11 _diffrn_reflns_limit_l_max 31 _diffrn_reflns_limit_l_min 0 _diffrn_reflns_number 5152 _diffrn_reflns_theta_full 25.98 _diffrn_reflns_theta_max 25.98 _diffrn_reflns_theta_min 2.39 _diffrn_standards_decay_% 2.5 _diffrn_standards_interval_count 'every 100' _diffrn_standards_interval_time 60 _diffrn_standards_number 2 _exptl_absorpt_coefficient_mu 1.031 _exptl_absorpt_correction_T_max 0.734 _exptl_absorpt_correction_T_min 0.566 _exptl_absorpt_correction_type empirical _exptl_absorpt_process_details '(North et al., 1968)' _exptl_crystal_colour colorless _exptl_crystal_density_diffrn 1.689 _exptl_crystal_density_method 'not measured' _exptl_crystal_description disks _exptl_crystal_F_000 1336 _exptl_crystal_size_max 0.7 _exptl_crystal_size_mid 0.5 _exptl_crystal_size_min 0.3 _refine_diff_density_max 0.549 _refine_diff_density_min -0.848 _refine_ls_extinction_method none _refine_ls_goodness_of_fit_ref 1.042 _refine_ls_hydrogen_treatment mixed _refine_ls_matrix_type full _refine_ls_number_parameters 366 _refine_ls_number_reflns 5038 _refine_ls_number_restraints 0 _refine_ls_restrained_S_all 1.042 _refine_ls_R_factor_all 0.038 _refine_ls_R_factor_gt 0.028 _refine_ls_shift/su_max 0.022 _refine_ls_shift/su_mean 0.000 _refine_ls_structure_factor_coef Fsqd _refine_ls_weighting_scheme 'calc w=1/[\s^2^(Fo^2^)+(0.0311P)^2^+2.5365P] where P=(Fo^2^+2Fc^2^)/3' _refine_ls_wR_factor_ref 0.072 _reflns_number_gt 4329 _reflns_number_total 5038 _reflns_threshold_expression I>2sigma(I) _[local]_cod_data_source_file qa0077.cif _[local]_cod_data_source_block rd24 _[local]_cod_cif_authors_sg_H-M 'P 21/n' _cod_database_code 2008110 loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-x+1/2, y+1/2, -z+1/2' '-x, -y, -z' 'x-1/2, -y-1/2, z-1/2' 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 Ag1 0.098235(16) 0.14618(2) 0.134475(7) 0.03820(7) Uani d . 1 . . Ag Cl1 0.36885(6) -0.07611(11) -0.03834(3) 0.0636(2) Uani d . 1 . . Cl O1 0.02055(17) -0.0891(2) 0.18746(7) 0.0470(4) Uani d . 1 . . O O2 0.24884(18) 0.0215(2) 0.20522(7) 0.0506(5) Uani d . 1 . . O O3 0.18526(16) 0.3956(2) 0.09663(8) 0.0492(5) Uani d . 1 . . O O4 0.03445(17) 0.4085(2) 0.17914(8) 0.0487(4) Uani d . 1 . . O N1 -0.10912(18) 0.1635(2) 0.14453(7) 0.0353(4) Uani d . 1 . . N N2 0.28809(17) 0.1024(2) 0.09914(8) 0.0345(4) Uani d . 1 . . N C1 0.3043(2) -0.0485(3) 0.07795(10) 0.0396(6) Uani d . 1 . . C H1A 0.3064 -0.1180 0.1068 0.048 Uiso calc R 1 . . H H1B 0.3816 -0.0530 0.0614 0.048 Uiso calc R 1 . . H C2 0.2087(2) -0.0985(3) 0.03876(9) 0.0335(5) Uani d . 1 . . C C3 0.0967(2) -0.1358(3) 0.05700(10) 0.0393(5) Uani d . 1 . . C H3 0.0794 -0.1182 0.0918 0.047 Uiso calc R 1 . . H C4 0.0103(2) -0.1986(3) 0.02463(10) 0.0438(6) Uani d . 1 . . C H4 -0.0654 -0.2197 0.0372 0.053 Uiso calc R 1 . . H C5 0.0364(2) -0.2298(3) -0.02636(10) 0.0416(6) Uani d . 1 . . C H5 -0.0212 -0.2764 -0.0475 0.050 Uiso calc R 1 . . H C6 0.1462(2) -0.1935(3) -0.04715(9) 0.0354(5) Uani d . 1 . . C C7 -0.1728(2) 0.2449(3) 0.10179(10) 0.0424(6) Uani d . 1 . . C H7A -0.1522 0.3490 0.1046 0.051 Uiso calc R 1 . . H H7B -0.2584 0.2363 0.1069 0.051 Uiso calc R 1 . . H C8 0.2304(2) -0.1252(3) -0.01375(9) 0.0358(5) Uani d . 1 . . C C9 -0.1588(2) 0.0109(3) 0.14748(11) 0.0453(6) Uani d . 1 . . C H9A -0.1448 -0.0392 0.1147 0.054 Uiso calc R 1 . . H H9B -0.2449 0.0175 0.1515 0.054 Uiso calc R 1 . . H C10 -0.1067(3) -0.0819(3) 0.19139(11) 0.0524(7) Uani d . 1 . . C H10A -0.1273 -0.0388 0.2246 0.063 Uiso calc R 1 . . H H10B -0.1402 -0.1811 0.1896 0.063 Uiso calc R 1 . . H C11 0.0817(3) -0.1088(4) 0.23607(11) 0.0578(8) Uani d . 1 . . C H11A 0.0550 -0.1994 0.2525 0.069 Uiso calc R 1 . . H H11B 0.0646 -0.0266 0.2591 0.069 Uiso calc R 1 . . H C12 0.2120(3) -0.1166(3) 0.22677(12) 0.0586(8) Uani d . 1 . . C H12A 0.2556 -0.1353 0.2593 0.070 Uiso calc R 1 . . H H12B 0.2288 -0.1966 0.2028 0.070 Uiso calc R 1 . . H C13 0.3674(2) 0.0194(3) 0.18686(10) 0.0496(7) Uani d . 1 . . C H13A 0.3875 -0.0795 0.1752 0.060 Uiso calc R 1 . . H H13B 0.4232 0.0466 0.2149 0.060 Uiso calc R 1 . . H C14 0.3775(2) 0.1271(3) 0.14241(10) 0.0453(6) Uani d . 1 . . C H14A 0.3676 0.2268 0.1557 0.054 Uiso calc R 1 . . H H14B 0.4575 0.1201 0.1285 0.054 Uiso calc R 1 . . H C15 0.3069(2) 0.2113(3) 0.05691(10) 0.0422(6) Uani d . 1 . . C H15A 0.2480 0.1932 0.0292 0.051 Uiso calc R 1 . . H H15B 0.3856 0.1948 0.0427 0.051 Uiso calc R 1 . . H C16 0.2979(3) 0.3722(3) 0.07352(12) 0.0503(7) Uani d . 1 . . C H16A 0.3621 0.3956 0.0984 0.060 Uiso calc R 1 . . H H16B 0.3057 0.4363 0.0434 0.060 Uiso calc R 1 . . H C17 0.1809(3) 0.5239(3) 0.12837(13) 0.0557(7) Uani d . 1 . . C H17A 0.1991 0.6111 0.1079 0.067 Uiso calc R 1 . . H H17B 0.2398 0.5166 0.1567 0.067 Uiso calc R 1 . . H C18 0.0585(3) 0.5361(3) 0.14950(14) 0.0595(8) Uani d . 1 . . C H18A 0.0532 0.6236 0.1713 0.071 Uiso calc R 1 . . H H18B 0.0000 0.5452 0.1211 0.071 Uiso calc R 1 . . H C19 -0.0861(3) 0.4005(3) 0.19593(11) 0.0499(7) Uani d . 1 . . C H19A -0.1375 0.4597 0.1731 0.060 Uiso calc R 1 . . H H19B -0.0911 0.4397 0.2310 0.060 Uiso calc R 1 . . H C20 -0.1276(2) 0.2413(3) 0.19493(10) 0.0481(7) Uani d . 1 . . C H20A -0.0850 0.1876 0.2224 0.058 Uiso calc R 1 . . H H20B -0.2123 0.2387 0.2026 0.058 Uiso calc R 1 . . H S1 0.57769(7) 0.64520(14) 0.15117(3) 0.0761(3) Uani d . 1 . . S C100 0.6141(4) 0.6207(5) 0.08422(15) 0.0706(10) Uani d . 1 . . C O10 0.4548(2) 0.6317(3) 0.15387(12) 0.0718(10) Uani d P 0.864(5) A 1 O O11 0.6143(7) 0.7967(11) 0.1627(3) 0.206(4) Uani d P 0.864(5) A 1 O O12 0.6509(6) 0.5536(10) 0.17922(19) 0.178(4) Uani d P 0.864(5) A 1 O O13 0.5724(13) 0.4381(16) 0.1494(6) 0.048(4) Uiso d P 0.136(5) A 2 O O14 0.5867(16) 0.8184(19) 0.1477(7) 0.035(4) Uiso d P 0.136(5) A 2 O O15 0.6779(19) 0.629(2) 0.1754(8) 0.049(5) Uiso d P 0.136(5) A 2 O F1 0.5982(7) 0.4780(5) 0.0722(3) 0.110(2) Uani d P 0.736(18) B 1 F F2 0.5391(8) 0.6890(12) 0.05245(18) 0.114(3) Uani d P 0.736(18) B 1 F F3 0.7239(8) 0.6473(15) 0.0725(4) 0.125(4) Uani d P 0.736(18) B 1 F F4 0.614(3) 0.763(3) 0.0684(12) 0.165(12) Uani d P 0.264(18) B 2 F F5 0.726(3) 0.600(5) 0.0786(13) 0.176(16) Uani d P 0.264(18) B 2 F F6 0.555(2) 0.554(7) 0.0515(9) 0.21(2) Uani d P 0.264(18) B 2 F loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 Ag1 0.03316(11) 0.03884(11) 0.04266(11) 0.00192(8) 0.00251(7) 0.00033(8) Cl1 0.0358(3) 0.1038(7) 0.0515(4) -0.0152(4) 0.0081(3) -0.0222(4) O1 0.0561(11) 0.0512(11) 0.0337(9) 0.0018(9) -0.0003(8) 0.0032(8) O2 0.0589(12) 0.0483(11) 0.0447(10) 0.0088(9) -0.0013(9) 0.0000(9) O3 0.0424(10) 0.0401(10) 0.0651(12) -0.0064(8) 0.0015(9) -0.0106(9) O4 0.0456(10) 0.0448(10) 0.0555(11) 0.0014(8) -0.0035(8) -0.0058(9) N1 0.0367(10) 0.0407(11) 0.0283(10) -0.0002(9) -0.0014(8) -0.0060(8) N2 0.0335(10) 0.0380(11) 0.0317(10) -0.0005(8) -0.0038(8) -0.0064(8) C1 0.0392(13) 0.0423(14) 0.0368(13) 0.0071(11) -0.0093(10) -0.0092(11) C2 0.0363(12) 0.0317(11) 0.0323(12) 0.0042(9) -0.0045(9) -0.0040(10) C3 0.0453(14) 0.0420(14) 0.0306(12) 0.0001(11) 0.0002(10) -0.0022(10) C4 0.0395(13) 0.0506(15) 0.0413(14) -0.0085(12) 0.0017(11) 0.0023(12) C5 0.0377(13) 0.0455(14) 0.0411(14) -0.0056(11) -0.0092(10) -0.0006(12) C6 0.0359(12) 0.0378(12) 0.0322(12) 0.0042(10) -0.0058(9) -0.0042(10) C7 0.0390(13) 0.0494(15) 0.0386(13) 0.0077(11) -0.0060(10) -0.0102(12) C8 0.0289(11) 0.0421(13) 0.0362(12) 0.0034(10) -0.0018(9) -0.0031(10) C9 0.0413(14) 0.0505(16) 0.0441(14) -0.0083(12) 0.0032(11) -0.0034(12) C10 0.0593(17) 0.0512(16) 0.0473(16) -0.0111(14) 0.0109(13) 0.0039(13) C11 0.080(2) 0.0592(18) 0.0340(14) -0.0014(16) -0.0053(14) 0.0102(13) C12 0.079(2) 0.0491(17) 0.0465(16) 0.0058(15) -0.0154(15) 0.0093(13) C13 0.0492(15) 0.0591(17) 0.0399(14) 0.0094(13) -0.0153(11) -0.0118(13) C14 0.0369(13) 0.0554(16) 0.0431(14) -0.0021(12) -0.0086(11) -0.0161(12) C15 0.0375(13) 0.0494(15) 0.0400(13) -0.0033(11) 0.0056(10) -0.0009(12) C16 0.0467(15) 0.0446(15) 0.0599(17) -0.0107(12) 0.0059(13) 0.0035(13) C17 0.0575(17) 0.0323(14) 0.077(2) -0.0063(12) -0.0005(15) -0.0087(14) C18 0.0598(18) 0.0346(14) 0.084(2) 0.0033(13) 0.0006(16) -0.0099(15) C19 0.0498(15) 0.0574(17) 0.0424(15) 0.0057(13) -0.0040(12) -0.0220(13) C20 0.0455(14) 0.0656(18) 0.0333(13) -0.0003(13) 0.0036(11) -0.0125(13) S1 0.0433(4) 0.1376(10) 0.0475(4) -0.0071(5) 0.0041(3) 0.0072(5) C100 0.072(2) 0.083(3) 0.057(2) 0.011(2) 0.0104(18) 0.0136(19) O10 0.0465(14) 0.090(2) 0.080(2) -0.0072(13) 0.0172(13) -0.0078(16) O11 0.159(6) 0.256(8) 0.205(8) -0.133(6) 0.059(5) -0.126(6) O12 0.143(5) 0.313(10) 0.080(3) 0.127(6) 0.034(3) 0.086(5) F1 0.126(5) 0.087(3) 0.117(4) 0.024(3) -0.002(3) -0.038(3) F2 0.143(6) 0.146(6) 0.052(3) 0.052(5) -0.008(3) 0.022(3) F3 0.084(5) 0.201(9) 0.093(4) -0.033(6) 0.048(3) 0.009(5) F4 0.23(3) 0.125(14) 0.148(18) 0.043(16) 0.059(19) 0.104(14) F5 0.120(17) 0.28(3) 0.134(15) 0.10(2) 0.094(12) 0.112(18) F6 0.097(15) 0.46(6) 0.084(14) -0.08(2) 0.019(11) -0.11(3) 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' N N 0.0061 0.0033 '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' F F 0.0171 0.0103 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' S S 0.1246 0.1234 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' Cl Cl 0.1484 0.1585 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' Ag Ag -0.8971 1.1015 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' loop_ _geom_angle_atom_site_label_1 _geom_angle_atom_site_label_2 _geom_angle_atom_site_label_3 _geom_angle_site_symmetry_3 _geom_angle N1 Ag1 N2 . 162.52(7) C11 O1 C10 . 113.7(2) C13 O2 C12 . 113.4(2) C16 O3 C17 . 113.8(2) C18 O4 C19 . 113.5(2) C7 N1 C9 . 108.87(19) C7 N1 C20 . 109.5(2) C9 N1 C20 . 109.5(2) C7 N1 Ag1 . 114.10(15) C9 N1 Ag1 . 108.32(15) C20 N1 Ag1 . 106.54(15) C15 N2 C1 . 108.80(19) C15 N2 C14 . 109.9(2) C1 N2 C14 . 108.98(19) C15 N2 Ag1 . 108.31(15) C1 N2 Ag1 . 114.50(15) C14 N2 Ag1 . 106.25(14) N2 C1 C2 . 115.28(19) C3 C2 C8 . 117.5(2) C3 C2 C1 . 118.3(2) C8 C2 C1 . 123.8(2) C4 C3 C2 . 121.3(2) C3 C4 C5 . 119.7(2) C4 C5 C6 . 121.7(2) C5 C6 C8 . 117.1(2) C5 C6 C7 3 118.6(2) C8 C6 C7 3 124.0(2) N1 C7 C6 3 115.5(2) C2 C8 C6 . 122.5(2) C2 C8 Cl1 . 118.80(18) C6 C8 Cl1 . 118.63(19) N1 C9 C10 . 114.5(2) O1 C10 C9 . 109.8(2) O1 C11 C12 . 108.5(2) O2 C12 C11 . 108.3(2) O2 C13 C14 . 109.3(2) N2 C14 C13 . 114.0(2) N2 C15 C16 . 114.8(2) O3 C16 C15 . 109.0(2) O3 C17 C18 . 108.3(2) O4 C18 C17 . 109.0(2) O4 C19 C20 . 109.5(2) N1 C20 C19 . 114.5(2) O15 S1 O12 . 32.9(8) O15 S1 O10 . 145.7(9) O12 S1 O10 . 120.4(4) O15 S1 O11 . 76.8(9) O12 S1 O11 . 107.6(5) O10 S1 O11 . 110.3(4) O15 S1 O14 . 95.0(10) O12 S1 O14 . 126.8(7) O10 S1 O14 . 99.0(7) O11 S1 O14 . 19.5(7) O15 S1 C100 . 103.7(10) O12 S1 C100 . 106.6(3) O10 S1 C100 . 106.63(19) O11 S1 C100 . 104.0(4) O14 S1 C100 . 93.0(7) O15 S1 O13 . 85.5(9) O12 S1 O13 . 54.7(6) O10 S1 O13 . 83.2(5) O11 S1 O13 . 162.2(6) O14 S1 O13 . 174.9(8) C100 S1 O13 . 82.0(5) F6 C100 F5 . 111(2) F6 C100 F3 . 115.6(10) F5 C100 F3 . 21(2) F6 C100 F2 . 58(3) F5 C100 F2 . 127.8(15) F3 C100 F2 . 111.3(6) F6 C100 F1 . 45(3) F5 C100 F1 . 87(2) F3 C100 F1 . 104.4(7) F2 C100 F1 . 103.4(5) F6 C100 F4 . 105(2) F5 C100 F4 . 95.9(18) F3 C100 F4 . 75.4(13) F2 C100 F4 . 50.7(16) F1 C100 F4 . 148.4(17) F6 C100 S1 . 126.5(10) F5 C100 S1 . 111.9(16) F3 C100 S1 . 116.0(5) F2 C100 S1 . 112.5(4) F1 C100 S1 . 108.0(4) F4 C100 S1 . 99.9(12) loop_ _geom_bond_atom_site_label_1 _geom_bond_atom_site_label_2 _geom_bond_site_symmetry_2 _geom_bond_distance Ag1 N1 . 2.338(2) Ag1 N2 . 2.356(2) Cl1 C8 . 1.739(2) O1 C11 . 1.417(3) O1 C10 . 1.426(3) O2 C13 . 1.414(3) O2 C12 . 1.427(4) O3 C16 . 1.418(3) O3 C17 . 1.418(3) O4 C18 . 1.409(4) O4 C19 . 1.423(3) N1 C7 . 1.486(3) N1 C9 . 1.487(3) N1 C20 . 1.489(3) N2 C15 . 1.481(3) N2 C1 . 1.480(3) N2 C14 . 1.491(3) C1 C2 . 1.516(3) C2 C3 . 1.386(3) C2 C8 . 1.394(3) C3 C4 . 1.378(4) C4 C5 . 1.375(4) C5 C6 . 1.386(4) C6 C8 . 1.399(3) C6 C7 3 1.512(3) C7 C6 3 1.512(3) C9 C10 . 1.509(4) C11 C12 . 1.480(5) C13 C14 . 1.504(4) C15 C16 . 1.517(4) C17 C18 . 1.485(4) C19 C20 . 1.510(4) S1 O15 . 1.27(2) S1 O12 . 1.356(5) S1 O10 . 1.379(3) S1 O11 . 1.455(8) S1 O14 . 1.570(18) S1 C100 . 1.787(4) S1 O13 . 1.871(15) C100 F6 . 1.213(18) C100 F5 . 1.27(3) C100 F3 . 1.289(9) C100 F2 . 1.308(6) C100 F1 . 1.335(7) C100 F4 . 1.346(17)