Wall clock time and date at job start Tue Mar 31 2020 14:00:47 AMSOL-version 7.1 by G. D. Hawkins, D. J. Giesen, G. C. Lynch, C. C. Chambers, I. Rossi, J. W. Storer, J. Li, J. D. Thompson, P. Winget, B. J. Lynch, D. Rinaldi, D. A. Liotard, C. J. Cramer, and D. G. Truhlar Copyright 2004 by Regents of the University of Minnesota. All rights reserved. Notice: recipients of this code are asked to comply with the user agreement in Section 1 of the documentation file. ******************************************************************************* * 1SCF - SCF CALCULATION WITHOUT GEOMETRY OPTIMIZATION * - USE EF ROUTINE FOR MINIMUM SEARCH (DEFAULT) * GEO-OK - OVERRIDE INTERATOMIC DISTANCE CHECK * TLIMIT= - A TIME OF 15. SECONDS REQUESTED * CHARGE - CHARGE ON SYSTEM= -1 * AM1 - THE AM1 HAMILTONIAN TO BE USED * DEV - DEVELOPER OPTIONS ARE ALLOWED * SM5.42R - SM5.42R CALCULATIONS WILL BE PERFORMED * - CHARGE MODEL 2 WILL BE USED (CM2A) * - THE SOLVENT IS USER-SPECIFIED * DIELEC - THE SOLVENT DIELECTRIC CONSTANT IS 2.06 * IOFR - THE SOLVENT INDEX OF REFRACTION IS 1.4345 * ALPHA - THE SOLVENT ALPHA IS 0.00 * BETA - THE SOLVENT BETA IS 0.00 * GAMMA - THE SOLVENT MACROSCOPIC SURFACE TENSION IS * 38.93 CAL MOL^-1 ANGSTROM^-2 * FACARB - THE FRACTION OF AROMATIC CARBONS IS 0.00 * FEHALO - THE FRACTION OF ELECTRONEGATIVE HALOGENS IS 0.00 ******************************************************************************* Atom NO. Chemical Bond length Bond angle Dihedral angle number (k) symbol (angstroms) (degrees) (degrees) (I) NA:I NB:NA:I NC:NB:NA:I NA NB NC 1 1 C 2 2 N 1.46903 * 1 3 3 C 1.46903 * 110.99834 * 2 1 4 4 C 1.46894 * 111.00292 * 123.95147 * 2 1 3 5 5 C 1.53005 * 109.47169 * 66.04825 * 4 2 1 6 6 N 1.46494 * 109.47291 * 180.02562 * 5 4 2 7 7 C 1.46920 * 124.35291 * 94.89718 * 6 5 4 8 8 C 1.53837 * 105.34852 * 163.54826 * 7 6 5 9 9 C 1.53966 * 102.46081 * 24.71691 * 8 7 6 10 10 C 1.34494 * 124.35316 * 274.87272 * 6 5 4 11 11 O 1.21279 * 124.94581 * 0.43774 * 10 6 5 12 12 C 1.52238 * 110.58548 * 142.56500 * 8 7 6 13 13 C 1.53255 * 109.35955 * 66.37847 * 12 8 7 14 14 C 1.53124 * 109.05853 * 56.43642 * 13 12 8 15 15 C 1.53038 * 109.41300 * 301.75249 * 14 13 12 16 16 N 1.45968 * 110.75100 * 266.61447 * 8 7 6 17 17 C 1.46895 * 111.00679 * 60.37064 * 16 8 7 18 18 C 1.52997 * 109.47852 * 170.36479 * 17 16 8 19 19 C 1.50695 * 109.47367 * 185.34698 * 18 17 16 20 20 H 1.08001 * 119.99969 * 354.72587 * 19 18 17 21 21 C 1.37871 * 120.00003 * 175.00672 * 19 18 17 22 22 N 1.31515 * 120.00233 * 5.04711 * 21 19 18 23 23 Si 1.86807 * 119.99965 * 185.04762 * 21 19 18 24 24 H 1.48498 * 109.46986 * 59.99853 * 23 21 19 25 25 H 1.48502 * 109.46843 * 179.97438 * 23 21 19 26 26 H 1.48494 * 109.47278 * 299.99716 * 23 21 19 27 27 H 1.09000 * 109.46854 * 296.04680 * 1 2 3 28 28 H 1.08999 * 109.47313 * 56.04664 * 1 2 3 29 29 H 1.09000 * 109.46931 * 176.04650 * 1 2 3 30 30 H 1.08998 * 109.47033 * 183.95287 * 3 2 1 31 31 H 1.08998 * 109.47012 * 303.95226 * 3 2 1 32 32 H 1.09002 * 109.47228 * 63.95461 * 3 2 1 33 33 H 1.09000 * 109.47537 * 306.04789 * 4 2 1 34 34 H 1.09002 * 109.47534 * 186.04341 * 4 2 1 35 35 H 1.09000 * 109.46920 * 59.99586 * 5 4 2 36 36 H 1.09002 * 109.46498 * 300.00151 * 5 4 2 37 37 H 1.09006 * 110.27023 * 44.58228 * 7 6 5 38 38 H 1.08999 * 110.34717 * 282.56277 * 7 6 5 39 39 H 1.08996 * 110.51069 * 94.51614 * 9 8 7 40 40 H 1.08998 * 110.50896 * 217.23073 * 9 8 7 41 41 H 1.09006 * 109.48649 * 306.41396 * 12 8 7 42 42 H 1.08998 * 109.51195 * 186.35849 * 12 8 7 43 43 H 1.09000 * 109.53699 * 296.56954 * 13 12 8 44 44 H 1.08992 * 109.61191 * 176.35900 * 13 12 8 45 45 H 1.09000 * 109.48212 * 181.76585 * 14 13 12 46 46 H 1.09007 * 109.48703 * 61.73959 * 14 13 12 47 47 H 1.09000 * 109.46833 * 299.76599 * 15 14 13 48 48 H 1.09000 * 109.47183 * 179.76009 * 15 14 13 49 49 H 1.09003 * 109.47014 * 50.35600 * 17 16 8 50 50 H 1.09008 * 109.46629 * 290.36545 * 17 16 8 51 51 H 1.08995 * 109.46927 * 65.33780 * 18 17 16 52 52 H 1.08999 * 109.46726 * 305.34628 * 18 17 16 53 53 H 0.97005 * 120.00324 * 180.02562 * 22 21 19 Note: An asterisk (*) indicates this parameter was or will be optimized. Cartesian coordinates (angstroms) NO. Atom X Y Z 1 6 0.0000 0.0000 0.0000 2 7 1.4690 0.0000 0.0000 3 6 1.9954 1.3715 0.0000 4 6 1.9955 -0.7659 1.1375 5 6 1.6316 -2.2426 0.9704 6 7 2.1561 -3.0063 2.1051 7 6 1.3824 -3.3395 3.3088 8 6 2.1692 -4.4666 3.9996 9 6 3.6015 -4.2363 3.4839 10 6 3.4077 -3.4931 2.1787 11 8 4.2577 -3.3563 1.3245 12 6 2.1139 -4.3085 5.5127 13 6 0.6745 -4.5220 5.9936 14 6 0.1903 -5.8977 5.5269 15 6 0.2801 -5.9779 4.0013 16 7 1.6739 -5.7745 3.5813 17 6 1.8178 -5.9526 2.1303 18 6 1.5174 -7.4070 1.7626 19 6 1.7917 -7.6215 0.2964 20 1 2.0627 -6.7847 -0.3303 21 6 1.6911 -8.8849 -0.2462 22 7 1.2601 -9.8849 0.4913 23 14 2.1669 -9.1765 -2.0289 24 1 3.5934 -8.8139 -2.2261 25 1 1.9697 -10.6092 -2.3659 26 1 1.3165 -8.3383 -2.9117 27 1 -0.3633 0.4513 0.9233 28 1 -0.3634 0.5740 -0.8524 29 1 -0.3633 -1.0252 -0.0709 30 1 3.0828 1.3433 -0.0708 31 1 1.5898 1.9163 -0.8524 32 1 1.7044 1.8724 0.9233 33 1 1.5612 -0.3872 2.0628 34 1 3.0798 -0.6611 1.1756 35 1 2.0659 -2.6213 0.0451 36 1 0.5473 -2.3474 0.9323 37 1 0.3869 -3.6877 3.0335 38 1 1.3103 -2.4721 3.9651 39 1 4.1681 -3.6283 4.1890 40 1 4.1026 -5.1886 3.3104 41 1 2.4436 -3.3060 5.7858 42 1 2.7666 -5.0459 5.9799 43 1 0.0316 -3.7479 5.5746 44 1 0.6414 -4.4737 7.0819 45 1 -0.8439 -6.0440 5.8384 46 1 0.8163 -6.6728 5.9692 47 1 -0.3490 -5.2053 3.5592 48 1 -0.0604 -6.9584 3.6683 49 1 2.8371 -5.7057 1.8333 50 1 1.1192 -5.2952 1.6125 51 1 0.4704 -7.6259 1.9722 52 1 2.1520 -8.0691 2.3516 53 1 1.1896 -10.7739 0.1097 RHF calculation, no. of doubly occupied orbitals= 63 REFERENCES FOR PARAMETERS IN GAS-PHASE HAMILTONIAN: H: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) C: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) N: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) O: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) Si: (AM1): M.J.S.DEWAR, C. JIE, ORGANOMETALLICS, 6, 1486-1490 (1987). REFERENCE FOR CHARGE MODEL 2: J. Li, J. Xing, C. J. Cramer, and D. G. Truhlar, J. Chem. Phys. 111 (1999) 885. REFERENCE FOR THE PARAMETERIZATION OF THE SM5.42R SOLVATION MODEL: J. Li, T. Zhu, G. D. Hawkins, P. Winget, D. A. Liotard, C. J. Cramer, and D. G. Truhlar, Theor. Chem. Acc. 103 (1999) 9-63 P. Winget, J. D. Thompson C. J. Cramer,and D. G. Truhlar, J. Phys. Chem. B. submitted. CHARGE=-1 AM1 1SCF TLIMIT=15 GEO-OK SM5.42R & SOLVNT=GENORG IOFR=1.4345 ALPHA=0.00 BETA=0.00 GAMMA=38.93 & DIELEC=2.06 FACARB=0.00 FEHALO=0.00 DEV ZINC001274039744.mol2 53 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Tue Mar 31 2020 14:00:47 Heat of formation + Delta-G solvation = -21.866796 kcal Electronic energy + Delta-G solvation = -29848.162537 eV Core-core repulsion = 26140.652917 eV Total energy + Delta-G solvation = -3707.509620 eV No. of doubly occupied orbitals = 63 Molecular weight (most abundant/longest-lived isotopes) = 323.231 amu Computer time = 0.79 seconds Orbital eigenvalues (eV) -41.29071 -38.46187 -37.63053 -35.43913 -34.30988 -32.96588 -32.40558 -29.64926 -29.15374 -27.97115 -27.82828 -26.28243 -24.86283 -24.02213 -23.30315 -21.61773 -21.27825 -20.20924 -19.61995 -18.27571 -16.96356 -16.69099 -16.05246 -15.73069 -15.33204 -15.18919 -14.92818 -14.83287 -14.54245 -14.40349 -14.14574 -13.95732 -13.56751 -13.24248 -13.01435 -12.89124 -12.67666 -12.58602 -12.44971 -12.14060 -11.99771 -11.96513 -11.80219 -11.75709 -11.57109 -11.23203 -11.17304 -10.95969 -10.90812 -10.64026 -10.59876 -10.43960 -10.26588 -9.76262 -9.45695 -9.36378 -9.10636 -8.74609 -8.53472 -8.28866 -7.78463 -5.97117 -3.98297 2.81778 2.98001 3.38010 3.41534 3.46351 3.88841 4.12282 4.41354 4.48980 4.57048 4.76706 4.80443 4.88720 4.92458 4.98853 5.03086 5.10948 5.21015 5.27316 5.30788 5.32981 5.36527 5.38955 5.39745 5.48534 5.59004 5.62477 5.67216 5.69565 5.74536 5.75462 5.91084 5.94233 5.97081 6.04919 6.08812 6.14122 6.22640 6.36233 6.48891 6.51650 6.57942 6.75579 6.80428 6.96949 7.24829 7.42388 7.54392 7.78567 7.88156 8.08148 8.38255 8.46231 9.08114 9.65454 11.14161 Molecular weight = 323.23amu Principal moments of inertia in cm(-1) A = 0.008622 B = 0.004708 C = 0.003481 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 3246.542282 B = 5945.743463 C = 8042.764187 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.020 3.980 2 N -0.545 5.545 3 C 0.027 3.973 4 C 0.043 3.957 5 C 0.131 3.869 6 N -0.616 5.616 7 C 0.075 3.925 8 C 0.106 3.894 9 C -0.147 4.147 10 C 0.523 3.477 11 O -0.528 6.528 12 C -0.098 4.098 13 C -0.120 4.120 14 C -0.117 4.117 15 C 0.052 3.948 16 N -0.518 5.518 17 C 0.060 3.940 18 C 0.031 3.969 19 C -0.520 4.520 20 H 0.052 0.948 21 C 0.061 3.939 22 N -0.894 5.894 23 Si 0.889 3.111 24 H -0.276 1.276 25 H -0.287 1.287 26 H -0.277 1.277 27 H 0.024 0.976 28 H 0.069 0.931 29 H 0.072 0.928 30 H 0.069 0.931 31 H 0.069 0.931 32 H 0.023 0.977 33 H 0.033 0.967 34 H 0.079 0.921 35 H 0.090 0.910 36 H 0.076 0.924 37 H 0.079 0.921 38 H 0.067 0.933 39 H 0.103 0.897 40 H 0.116 0.884 41 H 0.066 0.934 42 H 0.079 0.921 43 H 0.056 0.944 44 H 0.063 0.937 45 H 0.062 0.938 46 H 0.072 0.928 47 H 0.028 0.972 48 H 0.090 0.910 49 H 0.064 0.936 50 H 0.021 0.979 51 H 0.012 0.988 52 H 0.027 0.973 53 H 0.260 0.740 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -3.117 19.136 10.572 22.084 Note: The Mulliken population analysis charges presented below were not used in the solvation calculation but are provided for completeness. The chosen solvation model uses CM2 partial charges for calculating solvation energies. Net atomic charges, atomic populations, and dipole contributions using Mulliken population analysis Atom NO. Type Charge No. of electrons 1 C -0.129 4.129 2 N -0.269 5.269 3 C -0.121 4.121 4 C -0.087 4.087 5 C 0.009 3.991 6 N -0.351 5.351 7 C -0.050 4.050 8 C 0.015 3.985 9 C -0.187 4.187 10 C 0.311 3.689 11 O -0.404 6.404 12 C -0.136 4.136 13 C -0.158 4.158 14 C -0.155 4.155 15 C -0.075 4.075 16 N -0.241 5.241 17 C -0.066 4.066 18 C -0.006 4.006 19 C -0.559 4.559 20 H 0.070 0.930 21 C -0.140 4.140 22 N -0.533 5.533 23 Si 0.717 3.283 24 H -0.201 1.201 25 H -0.213 1.213 26 H -0.203 1.203 27 H 0.043 0.957 28 H 0.088 0.912 29 H 0.091 0.909 30 H 0.088 0.912 31 H 0.088 0.912 32 H 0.042 0.958 33 H 0.052 0.948 34 H 0.097 0.903 35 H 0.109 0.891 36 H 0.094 0.906 37 H 0.097 0.903 38 H 0.085 0.915 39 H 0.121 0.879 40 H 0.134 0.866 41 H 0.084 0.916 42 H 0.097 0.903 43 H 0.075 0.925 44 H 0.081 0.919 45 H 0.081 0.919 46 H 0.091 0.909 47 H 0.046 0.954 48 H 0.108 0.892 49 H 0.082 0.918 50 H 0.040 0.960 51 H 0.031 0.969 52 H 0.046 0.954 53 H 0.070 0.930 Dipole moment (debyes) X Y Z Total from point charges -2.288 18.460 9.837 21.042 hybrid contribution -0.702 0.843 -0.723 1.314 sum -2.990 19.303 9.114 21.555 Atomic orbital electron populations 1.22480 0.87291 1.02671 1.00414 1.61859 1.08049 1.13911 1.43073 1.22368 1.00982 0.88469 1.00315 1.22507 1.00942 0.94116 0.91087 1.21266 0.99087 0.89454 0.89322 1.48211 1.13367 1.54570 1.18912 1.22858 0.96896 0.98660 0.86560 1.21351 0.93410 0.88460 0.95329 1.22472 0.97803 1.02976 0.95480 1.20916 0.81533 0.78036 0.88403 1.90724 1.45813 1.59758 1.44111 1.21433 0.97786 1.01744 0.92604 1.21613 0.96068 0.97746 1.00335 1.21608 1.00879 0.97217 0.95822 1.22174 0.88556 1.02110 0.94653 1.61976 1.20141 1.25045 1.16938 1.22460 1.00026 1.01005 0.83131 1.19069 0.96797 0.88833 0.95898 1.21115 1.46928 0.93576 0.94303 0.92976 1.24943 0.95121 0.96206 0.97733 1.69963 1.46228 1.00634 1.36436 0.86698 0.79353 0.76960 0.85281 1.20113 1.21284 1.20310 0.95704 0.91241 0.90905 0.91238 0.91232 0.95815 0.94840 0.90298 0.89126 0.90550 0.90328 0.91454 0.87879 0.86588 0.91581 0.90251 0.92479 0.91863 0.91885 0.90906 0.95374 0.89180 0.91780 0.96044 0.96931 0.95433 0.92992 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 13. Note: The number of geometries may not correspond to the number of cycles due to rejected geometry changes. In the following table subtotal= G_P + SS G_CDS. Atom Chem. CM2 G_P Area Sigma k SS G_CDS Subtotal M number symbol chg. (kcal) (Ang**2) cal/(Ang**2) (kcal) (kcal) value 1 C 0.02 0.18 9.32 60.07 0.56 0.74 16 2 N -0.54 -6.05 5.02 -251.26 -1.26 -7.31 16 3 C 0.03 0.24 9.57 60.07 0.57 0.82 16 4 C 0.04 0.50 5.28 -3.82 -0.02 0.48 16 5 C 0.13 1.78 5.82 -4.04 -0.02 1.76 16 6 N -0.62 -8.89 2.23 -172.60 -0.39 -9.28 16 7 C 0.08 0.92 4.78 -3.38 -0.02 0.91 16 8 C 0.11 1.39 0.71 -131.56 -0.09 1.30 16 9 C -0.15 -2.08 5.44 -27.02 -0.15 -2.23 16 10 C 0.52 8.85 6.10 -10.75 -0.07 8.78 16 11 O -0.53 -10.99 17.67 5.56 0.10 -10.89 16 12 C -0.10 -0.99 4.66 -26.99 -0.13 -1.11 16 13 C -0.12 -1.13 5.82 -26.54 -0.15 -1.29 16 14 C -0.12 -1.36 6.07 -26.65 -0.16 -1.52 16 15 C 0.05 0.79 5.05 -3.76 -0.02 0.77 16 16 N -0.52 -8.55 4.47 -218.92 -0.98 -9.53 16 17 C 0.06 1.25 3.50 -3.83 -0.01 1.24 16 18 C 0.03 0.81 4.75 -27.89 -0.13 0.68 16 19 C -0.52 -15.03 9.10 -34.44 -0.31 -15.34 16 20 H 0.05 1.51 7.75 -52.49 -0.41 1.10 16 21 C 0.06 1.79 5.45 -17.82 -0.10 1.69 16 22 N -0.89 -26.98 13.29 55.43 0.74 -26.25 16 23 Si 0.89 22.31 29.54 -169.99 -5.02 17.28 16 24 H -0.28 -6.89 7.11 56.52 0.40 -6.49 16 25 H -0.29 -7.06 7.11 56.52 0.40 -6.66 16 26 H -0.28 -6.84 7.11 56.52 0.40 -6.44 16 27 H 0.02 0.21 8.14 -51.93 -0.42 -0.21 16 28 H 0.07 0.56 8.12 -51.93 -0.42 0.14 16 29 H 0.07 0.69 6.47 -51.93 -0.34 0.35 16 30 H 0.07 0.63 8.12 -51.93 -0.42 0.21 16 31 H 0.07 0.54 8.12 -51.93 -0.42 0.12 16 32 H 0.02 0.19 8.14 -51.93 -0.42 -0.23 16 33 H 0.03 0.36 8.12 -51.93 -0.42 -0.06 16 34 H 0.08 1.05 8.06 -51.93 -0.42 0.63 16 35 H 0.09 1.47 8.04 -51.93 -0.42 1.05 16 36 H 0.08 0.93 6.54 -51.93 -0.34 0.59 16 37 H 0.08 1.01 5.74 -51.93 -0.30 0.71 16 38 H 0.07 0.68 7.78 -51.93 -0.40 0.27 16 39 H 0.10 1.16 7.86 -51.93 -0.41 0.75 16 40 H 0.12 1.86 7.38 -51.93 -0.38 1.48 16 41 H 0.07 0.54 8.05 -51.93 -0.42 0.13 16 42 H 0.08 0.83 8.14 -51.93 -0.42 0.41 16 43 H 0.06 0.51 7.58 -51.93 -0.39 0.12 16 44 H 0.06 0.51 8.14 -51.93 -0.42 0.09 16 45 H 0.06 0.65 8.14 -51.93 -0.42 0.22 16 46 H 0.07 0.90 8.14 -51.93 -0.42 0.48 16 47 H 0.03 0.40 6.19 -51.93 -0.32 0.08 16 48 H 0.09 1.59 6.36 -51.93 -0.33 1.25 16 49 H 0.06 1.44 5.20 -51.93 -0.27 1.17 16 50 H 0.02 0.45 7.01 -51.92 -0.36 0.09 16 51 H 0.01 0.34 6.70 -51.93 -0.35 -0.01 16 52 H 0.03 0.77 8.14 -51.93 -0.42 0.35 16 53 H 0.26 7.46 8.31 -40.82 -0.34 7.12 16 LS Contribution 395.49 15.07 5.96 5.96 Total: -1.00 -32.80 395.49 -10.74 -43.54 By element: Atomic # 1 Polarization: 8.45 SS G_CDS: -9.64 Total: -1.19 kcal Atomic # 6 Polarization: -2.08 SS G_CDS: -0.25 Total: -2.33 kcal Atomic # 7 Polarization: -50.48 SS G_CDS: -1.89 Total: -52.37 kcal Atomic # 8 Polarization: -10.99 SS G_CDS: 0.10 Total: -10.89 kcal Atomic # 14 Polarization: 22.31 SS G_CDS: -5.02 Total: 17.28 kcal Total LS contribution 5.96 Total: 5.96 kcal Total: -32.80 -10.74 -43.54 kcal The number of atoms in the molecule is 53 The average number of expansion shells was 16.00 The maximum number of expansion shells was 16 The minimum number of expansion shells was 16 **** NOTA BENE **** This is the net solvation energy for this exact molecular structure (nuclear and electronic)! The standard-state solvation energy should be obtained as the difference between the heat of formation plus delta-G solvation for the relaxed solvated system and that for the relaxed gas-phase system. ZINC001274039744.mol2 53 1SCF run This is a breakdown of the solvation energy calculated without geometric relaxation in solution: (1) E-EN(sol) electronic-nuclear energy of solute 21.675 kcal (2) G-P(sol) polarization free energy of solvation -32.804 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -11.129 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.738 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -43.542 kcal (6) G-S(sol) free energy of system = (1) + (5) -21.867 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.79 seconds