Wall clock time and date at job start Sat Apr 11 2020 06:10:04 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 C 1.53001 * 1 3 3 C 1.52997 * 109.47294 * 2 1 4 4 C 1.52999 * 109.47085 * 179.97438 * 3 2 1 5 5 C 1.53004 * 109.46906 * 180.02562 * 4 3 2 6 6 C 1.53003 * 109.46807 * 180.02562 * 5 4 3 7 7 C 1.53004 * 109.46807 * 179.97438 * 6 5 4 8 8 H 1.08995 * 109.47216 * 304.99653 * 7 6 5 9 9 C 1.52999 * 109.47083 * 184.99648 * 7 6 5 10 10 N 1.46498 * 109.47065 * 64.99542 * 7 6 5 11 11 C 1.34777 * 119.99828 * 204.72115 * 10 7 6 12 12 O 1.21353 * 120.00267 * 0.28147 * 11 10 7 13 13 C 1.49445 * 120.00114 * 180.27895 * 11 10 7 14 14 O 1.21353 * 120.00086 * 359.97438 * 13 11 10 15 15 N 1.34777 * 120.00110 * 180.02562 * 13 11 10 16 16 C 1.47021 * 125.64884 * 359.68530 * 15 13 11 17 17 C 1.54340 * 107.26446 * 178.85296 * 16 15 13 18 18 C 1.55157 * 103.02172 * 338.14333 * 17 16 15 19 19 O 1.42904 * 111.00388 * 277.23346 * 18 17 16 20 20 C 1.50693 * 111.03524 * 153.39532 * 18 17 16 21 21 H 1.07998 * 120.00104 * 6.33652 * 20 18 17 22 22 C 1.37879 * 119.99829 * 186.32634 * 20 18 17 23 23 N 1.31515 * 119.99943 * 0.02562 * 22 20 18 24 24 Si 1.86803 * 120.00058 * 179.97438 * 22 20 18 25 25 H 1.48505 * 109.47027 * 90.00379 * 24 22 20 26 26 H 1.48499 * 109.47371 * 210.00181 * 24 22 20 27 27 H 1.48504 * 109.47050 * 330.00584 * 24 22 20 28 28 C 1.47432 * 125.64690 * 180.02562 * 15 13 11 29 29 H 1.09002 * 109.46946 * 299.99943 * 1 2 3 30 30 H 1.08998 * 109.46884 * 60.00032 * 1 2 3 31 31 H 1.08996 * 109.47271 * 179.97438 * 1 2 3 32 32 H 1.09002 * 109.46946 * 240.00057 * 2 1 3 33 33 H 1.08998 * 109.46884 * 119.99968 * 2 1 3 34 34 H 1.09002 * 109.47078 * 60.00137 * 3 2 1 35 35 H 1.08998 * 109.47128 * 299.99818 * 3 2 1 36 36 H 1.09002 * 109.46788 * 60.00282 * 4 3 2 37 37 H 1.08998 * 109.47252 * 300.00064 * 4 3 2 38 38 H 1.08988 * 109.47519 * 60.00257 * 5 4 3 39 39 H 1.08998 * 109.47048 * 299.99982 * 5 4 3 40 40 H 1.08993 * 109.47316 * 60.00091 * 6 5 4 41 41 H 1.08998 * 109.46869 * 299.99561 * 6 5 4 42 42 H 1.08995 * 109.47098 * 300.00077 * 9 7 6 43 43 H 1.09003 * 109.47054 * 59.99725 * 9 7 6 44 44 H 1.08996 * 109.47245 * 179.97438 * 9 7 6 45 45 H 0.97001 * 120.00384 * 25.00562 * 10 7 6 46 46 H 1.08999 * 109.88384 * 298.39724 * 16 15 13 47 47 H 1.09004 * 109.88137 * 59.56907 * 16 15 13 48 48 H 1.09003 * 110.84913 * 219.67299 * 17 16 15 49 49 H 1.08998 * 110.66650 * 96.52719 * 17 16 15 50 50 H 0.96695 * 114.00220 * 173.65427 * 19 18 17 51 51 H 0.97000 * 119.99899 * 179.97438 * 23 22 20 52 52 H 1.09000 * 110.36801 * 322.92508 * 28 15 13 53 53 H 1.08993 * 110.36620 * 85.14001 * 28 15 13 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 6 1.5300 0.0000 0.0000 3 6 2.0400 1.4425 0.0000 4 6 3.5700 1.4424 0.0006 5 6 4.0800 2.8849 0.0013 6 6 5.6101 2.8849 0.0013 7 6 6.1201 4.3274 0.0013 8 1 5.6855 4.8664 -0.8405 9 6 7.6449 4.3292 -0.1243 10 7 5.7324 4.9824 1.2530 11 6 5.6111 6.3238 1.3022 12 8 5.8179 6.9886 0.3083 13 6 5.2217 6.9925 2.5807 14 8 5.0143 6.3277 3.5745 15 7 5.0998 8.3338 2.6297 16 6 5.3258 9.2563 1.5075 17 6 5.0414 10.6831 2.0229 18 6 4.1315 10.4348 3.2549 19 8 2.7704 10.2545 2.8585 20 6 4.2561 11.5560 4.2541 21 1 4.8373 12.4333 4.0115 22 6 3.6280 11.4617 5.4778 23 7 2.9205 10.3932 5.7733 24 14 3.7830 12.8512 6.7167 25 1 2.6834 13.8269 6.5064 26 1 3.6984 12.2993 8.0928 27 1 5.0903 13.5321 6.5359 28 6 4.7247 9.1196 3.8195 29 1 -0.3633 0.5138 0.8900 30 1 -0.3633 0.5138 -0.8900 31 1 -0.3633 -1.0276 -0.0005 32 1 1.8933 -0.5138 -0.8900 33 1 1.8933 -0.5138 0.8900 34 1 1.6767 1.9563 0.8900 35 1 1.6768 1.9563 -0.8900 36 1 3.9337 0.9284 -0.8892 37 1 3.9330 0.9287 0.8908 38 1 3.7164 3.3985 0.8912 39 1 3.7171 3.3990 -0.8887 40 1 5.9734 2.3715 -0.8889 41 1 5.9733 2.3707 0.8911 42 1 8.0795 3.7902 0.7175 43 1 7.9333 3.8418 -1.0557 44 1 8.0082 5.3568 -0.1248 45 1 5.5671 4.4510 2.0476 46 1 6.3590 9.1817 1.1684 47 1 4.6466 9.0177 0.6890 48 1 4.5177 11.2708 1.2689 49 1 5.9668 11.1763 2.3201 50 1 2.1805 10.0008 3.5814 51 1 2.4789 10.3267 6.6344 52 1 3.9760 8.5866 4.4055 53 1 5.6040 9.3287 4.4286 RHF calculation, no. of doubly occupied orbitals= 66 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 ZINC001349171329.mol2 53 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Sat Apr 11 2020 06:10:04 Heat of formation + Delta-G solvation = -153.777898 kcal Electronic energy + Delta-G solvation = -30390.009477 eV Core-core repulsion = 26260.378909 eV Total energy + Delta-G solvation = -4129.630569 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 0.68 seconds Orbital eigenvalues (eV) -40.40239 -38.72229 -37.28166 -37.11514 -35.85923 -34.27129 -33.04031 -32.25215 -31.04706 -30.20796 -28.46194 -27.89572 -25.95528 -24.82428 -23.88145 -22.26047 -21.48444 -21.24723 -20.68288 -19.81117 -19.44006 -17.31475 -17.11405 -16.77410 -16.12497 -15.81794 -15.47268 -15.14863 -14.66794 -14.55564 -14.47967 -14.38441 -14.03128 -13.77225 -13.63652 -13.07110 -13.04745 -12.91515 -12.86350 -12.69028 -12.42525 -12.25899 -11.99229 -11.79963 -11.69136 -11.64011 -11.49705 -11.24345 -11.14750 -11.07046 -11.04661 -10.92415 -10.78988 -10.71934 -10.58018 -10.53624 -10.47453 -10.21244 -9.37887 -9.19714 -9.09303 -8.70452 -8.40390 -7.89394 -6.30013 -4.39477 1.83624 2.69262 3.20237 3.27775 3.30272 3.63696 3.92699 4.24838 4.26356 4.60400 4.64052 4.72857 4.76618 4.83249 4.88458 4.97775 5.06263 5.19594 5.24601 5.27071 5.45920 5.47270 5.50043 5.51046 5.52278 5.61691 5.71139 5.72684 5.78888 5.79973 5.83946 5.85646 5.89262 6.01277 6.05208 6.06937 6.10095 6.16603 6.28014 6.41834 6.52273 6.73617 6.81026 6.85350 7.17616 7.27928 7.33882 7.71950 7.91392 8.01125 8.08542 8.47507 8.64781 9.27906 9.36422 10.77186 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.012617 B = 0.002360 C = 0.002111 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2218.727564 B =11862.786670 C =13263.334839 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.154 4.154 2 C -0.125 4.125 3 C -0.123 4.123 4 C -0.118 4.118 5 C -0.124 4.124 6 C -0.126 4.126 7 C 0.140 3.860 8 H 0.091 0.909 9 C -0.164 4.164 10 N -0.702 5.702 11 C 0.511 3.489 12 O -0.518 6.518 13 C 0.506 3.494 14 O -0.539 6.539 15 N -0.575 5.575 16 C 0.112 3.888 17 C -0.122 4.122 18 C 0.248 3.752 19 O -0.581 6.581 20 C -0.536 4.536 21 H 0.068 0.932 22 C 0.070 3.930 23 N -0.894 5.894 24 Si 0.905 3.095 25 H -0.278 1.278 26 H -0.285 1.285 27 H -0.272 1.272 28 C 0.092 3.908 29 H 0.055 0.945 30 H 0.053 0.947 31 H 0.052 0.948 32 H 0.059 0.941 33 H 0.060 0.940 34 H 0.063 0.937 35 H 0.061 0.939 36 H 0.060 0.940 37 H 0.061 0.939 38 H 0.067 0.933 39 H 0.063 0.937 40 H 0.079 0.921 41 H 0.070 0.930 42 H 0.058 0.942 43 H 0.066 0.934 44 H 0.062 0.938 45 H 0.410 0.590 46 H 0.064 0.936 47 H 0.070 0.930 48 H 0.076 0.924 49 H 0.078 0.922 50 H 0.381 0.619 51 H 0.270 0.730 52 H 0.090 0.910 53 H 0.067 0.933 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 3.332 -17.848 -11.590 21.540 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 -0.212 4.212 2 C -0.162 4.162 3 C -0.161 4.161 4 C -0.156 4.156 5 C -0.162 4.162 6 C -0.164 4.164 7 C 0.036 3.964 8 H 0.109 0.891 9 C -0.223 4.223 10 N -0.356 5.356 11 C 0.292 3.708 12 O -0.393 6.393 13 C 0.288 3.712 14 O -0.418 6.418 15 N -0.307 5.307 16 C -0.010 4.010 17 C -0.160 4.160 18 C 0.208 3.792 19 O -0.389 6.389 20 C -0.574 4.574 21 H 0.086 0.914 22 C -0.133 4.133 23 N -0.532 5.532 24 Si 0.732 3.268 25 H -0.204 1.204 26 H -0.210 1.210 27 H -0.197 1.197 28 C -0.029 4.029 29 H 0.074 0.926 30 H 0.072 0.928 31 H 0.071 0.929 32 H 0.077 0.923 33 H 0.079 0.921 34 H 0.082 0.918 35 H 0.080 0.920 36 H 0.078 0.922 37 H 0.080 0.920 38 H 0.085 0.915 39 H 0.082 0.918 40 H 0.097 0.903 41 H 0.088 0.912 42 H 0.077 0.923 43 H 0.085 0.915 44 H 0.081 0.919 45 H 0.246 0.754 46 H 0.082 0.918 47 H 0.088 0.912 48 H 0.095 0.905 49 H 0.096 0.904 50 H 0.230 0.770 51 H 0.080 0.920 52 H 0.109 0.891 53 H 0.085 0.915 Dipole moment (debyes) X Y Z Total from point charges 3.515 -17.700 -12.241 21.805 hybrid contribution -0.209 0.248 1.687 1.718 sum 3.306 -17.452 -10.554 20.661 Atomic orbital electron populations 1.21788 0.95966 1.01455 1.01965 1.21534 0.95854 0.97044 1.01781 1.21645 0.95450 0.96631 1.02344 1.21594 0.95436 0.96661 1.01869 1.21646 0.94743 0.96921 1.02860 1.21911 0.96221 0.95068 1.03159 1.21071 0.95077 0.93141 0.87158 0.89143 1.22188 0.95180 1.02880 1.02014 1.45860 1.69175 1.06380 1.14209 1.20404 0.77957 0.83075 0.89325 1.90718 1.48392 1.63928 1.36244 1.19623 0.80686 0.82457 0.88392 1.90721 1.51427 1.63380 1.36296 1.48671 1.62880 1.04206 1.14901 1.22134 1.00567 0.89557 0.88785 1.22713 1.00005 0.94180 0.99079 1.19642 0.79997 0.89999 0.89584 1.86132 1.20138 1.92251 1.40419 1.21460 1.32744 1.03850 0.99387 0.91387 1.25093 0.94047 0.95998 0.98153 1.69711 1.32302 1.27408 1.23792 0.86388 0.78737 0.81716 0.79978 1.20372 1.21024 1.19681 1.23481 1.00258 0.93353 0.85769 0.92629 0.92782 0.92931 0.92253 0.92131 0.91810 0.92030 0.92154 0.92016 0.91464 0.91792 0.90269 0.91179 0.92331 0.91542 0.91872 0.75377 0.91789 0.91193 0.90548 0.90389 0.76966 0.91976 0.89124 0.91478 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 -0.15 -1.07 9.91 37.16 0.37 -0.70 16 2 C -0.12 -0.88 5.93 -26.73 -0.16 -1.03 16 3 C -0.12 -0.96 5.21 -26.73 -0.14 -1.10 16 4 C -0.12 -0.86 5.21 -26.73 -0.14 -1.00 16 5 C -0.12 -1.05 5.10 -26.73 -0.14 -1.18 16 6 C -0.13 -0.95 4.75 -26.73 -0.13 -1.08 16 7 C 0.14 1.42 2.57 -67.93 -0.17 1.24 16 8 H 0.09 1.04 7.58 -51.93 -0.39 0.64 16 9 C -0.16 -1.53 9.48 37.16 0.35 -1.18 16 10 N -0.70 -9.02 4.52 -54.24 -0.25 -9.27 16 11 C 0.51 8.60 7.82 -11.59 -0.09 8.51 16 12 O -0.52 -9.35 13.79 5.49 0.08 -9.27 16 13 C 0.51 10.21 7.91 -11.59 -0.09 10.12 16 14 O -0.54 -11.81 16.73 5.49 0.09 -11.72 16 15 N -0.57 -12.25 3.33 -171.00 -0.57 -12.82 16 16 C 0.11 2.19 5.49 -3.06 -0.02 2.17 16 17 C -0.12 -2.50 6.13 -24.89 -0.15 -2.65 16 18 C 0.25 6.01 0.87 -89.61 -0.08 5.94 16 19 O -0.58 -14.81 13.16 -35.23 -0.46 -15.27 16 20 C -0.54 -13.83 8.27 -34.44 -0.28 -14.11 16 21 H 0.07 1.72 7.79 -52.49 -0.41 1.31 16 22 C 0.07 1.81 5.29 -17.82 -0.09 1.72 16 23 N -0.89 -23.51 10.69 55.43 0.59 -22.92 16 24 Si 0.90 20.18 29.54 -169.99 -5.02 15.15 16 25 H -0.28 -6.21 7.11 56.52 0.40 -5.80 16 26 H -0.28 -6.35 7.11 56.52 0.40 -5.94 16 27 H -0.27 -6.00 7.11 56.52 0.40 -5.60 16 28 C 0.09 2.20 5.38 -2.51 -0.01 2.18 16 29 H 0.05 0.40 8.14 -51.93 -0.42 -0.02 16 30 H 0.05 0.37 8.14 -51.93 -0.42 -0.06 16 31 H 0.05 0.32 8.14 -51.93 -0.42 -0.10 16 32 H 0.06 0.39 8.14 -51.93 -0.42 -0.04 16 33 H 0.06 0.42 8.14 -51.93 -0.42 0.00 16 34 H 0.06 0.55 8.14 -51.93 -0.42 0.13 16 35 H 0.06 0.49 8.14 -51.93 -0.42 0.07 16 36 H 0.06 0.40 8.14 -51.93 -0.42 -0.02 16 37 H 0.06 0.44 8.14 -51.93 -0.42 0.02 16 38 H 0.07 0.68 7.75 -51.94 -0.40 0.27 16 39 H 0.06 0.57 8.14 -51.93 -0.42 0.15 16 40 H 0.08 0.49 8.14 -51.93 -0.42 0.07 16 41 H 0.07 0.49 8.14 -51.93 -0.42 0.07 16 42 H 0.06 0.51 8.14 -51.93 -0.42 0.08 16 43 H 0.07 0.49 8.14 -51.93 -0.42 0.07 16 44 H 0.06 0.72 8.14 -51.93 -0.42 0.30 16 45 H 0.41 4.96 8.07 -40.82 -0.33 4.63 16 46 H 0.06 1.15 7.71 -51.93 -0.40 0.75 16 47 H 0.07 1.38 7.57 -51.93 -0.39 0.98 16 48 H 0.08 1.50 8.14 -51.93 -0.42 1.08 16 49 H 0.08 1.49 8.03 -51.93 -0.42 1.08 16 50 H 0.38 9.87 7.56 45.56 0.34 10.21 16 51 H 0.27 6.83 8.31 -40.82 -0.34 6.49 16 52 H 0.09 2.39 7.33 -51.93 -0.38 2.01 16 53 H 0.07 1.63 8.03 -51.93 -0.42 1.22 16 LS Contribution 424.44 15.07 6.40 6.40 Total: -1.00 -28.62 424.44 -9.22 -37.83 By element: Atomic # 1 Polarization: 23.14 SS G_CDS: -9.10 Total: 14.04 kcal Atomic # 6 Polarization: 8.82 SS G_CDS: -0.98 Total: 7.85 kcal Atomic # 7 Polarization: -44.79 SS G_CDS: -0.22 Total: -45.01 kcal Atomic # 8 Polarization: -35.96 SS G_CDS: -0.30 Total: -36.26 kcal Atomic # 14 Polarization: 20.18 SS G_CDS: -5.02 Total: 15.15 kcal Total LS contribution 6.40 Total: 6.40 kcal Total: -28.62 -9.22 -37.83 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. ZINC001349171329.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 -115.945 kcal (2) G-P(sol) polarization free energy of solvation -28.616 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -144.561 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.217 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -37.833 kcal (6) G-S(sol) free energy of system = (1) + (5) -153.778 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.69 seconds