Wall clock time and date at job start Wed Apr 1 2020 03:51:21 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 1.50697 * 1 3 3 N 1.30842 * 125.89337 * 2 1 4 4 N 1.40085 * 108.19873 * 180.02562 * 3 2 1 5 5 H 0.97007 * 126.03265 * 179.97438 * 4 3 2 6 6 C 1.34947 * 107.92953 * 359.76168 * 4 3 2 7 7 C 1.50694 * 126.12948 * 180.23878 * 6 4 3 8 8 C 1.35320 * 107.74272 * 0.38540 * 6 4 3 9 9 C 1.50697 * 126.03596 * 179.87444 * 8 6 4 10 10 C 1.50699 * 109.47268 * 269.71582 * 9 8 6 11 11 O 1.21283 * 119.99932 * 0.02562 * 10 9 8 12 12 N 1.34780 * 119.99787 * 180.02562 * 10 9 8 13 13 C 1.46503 * 119.99649 * 179.97438 * 12 10 9 14 14 C 1.52996 * 115.54660 * 179.97438 * 13 12 10 15 15 C 1.53041 * 109.46407 * 39.41749 * 14 13 12 16 16 C 1.53187 * 109.31222 * 181.37129 * 15 14 13 17 17 N 1.46923 * 108.77790 * 305.36434 * 16 15 14 18 18 C 1.36937 * 120.63106 * 233.59113 * 17 16 15 19 19 H 1.07999 * 120.00670 * 28.08923 * 18 17 16 20 20 C 1.38814 * 119.99803 * 208.08899 * 18 17 16 21 21 N 1.31623 * 120.00319 * 17.64661 * 20 18 17 22 22 Si 1.86803 * 119.99964 * 197.64539 * 20 18 17 23 23 H 1.48504 * 109.46901 * 94.06968 * 22 20 18 24 24 H 1.48504 * 109.47303 * 214.06646 * 22 20 18 25 25 H 1.48501 * 109.46970 * 334.06889 * 22 20 18 26 26 C 1.46928 * 118.73762 * 53.86377 * 17 16 15 27 27 C 1.53042 * 109.44689 * 159.48064 * 14 13 12 28 28 C 1.52997 * 117.49904 * 325.66795 * 13 12 10 29 29 C 1.52999 * 117.49795 * 34.33108 * 13 12 10 30 30 H 1.09002 * 109.47622 * 269.97965 * 1 2 3 31 31 H 1.09002 * 109.47590 * 29.97709 * 1 2 3 32 32 H 1.09004 * 109.47064 * 149.97473 * 1 2 3 33 33 H 1.09003 * 109.47250 * 270.17763 * 7 6 4 34 34 H 1.09007 * 109.47273 * 30.17323 * 7 6 4 35 35 H 1.08998 * 109.47422 * 150.16980 * 7 6 4 36 36 H 1.08999 * 109.46848 * 149.71353 * 9 8 6 37 37 H 1.09006 * 109.47221 * 29.72015 * 9 8 6 38 38 H 0.96997 * 120.00262 * 359.97438 * 12 10 9 39 39 H 1.09006 * 109.46226 * 279.44155 * 14 13 12 40 40 H 1.09008 * 109.49455 * 61.41812 * 15 14 13 41 41 H 1.09001 * 109.52434 * 301.34127 * 15 14 13 42 42 H 1.09007 * 109.58222 * 185.57855 * 16 15 14 43 43 H 1.08993 * 109.58972 * 65.15530 * 16 15 14 44 44 H 0.96997 * 120.00013 * 180.02562 * 21 20 18 45 45 H 1.08992 * 109.58852 * 65.92480 * 26 17 16 46 46 H 1.09003 * 109.58716 * 186.35598 * 26 17 16 47 47 H 1.08996 * 109.49676 * 298.57319 * 27 14 13 48 48 H 1.09003 * 109.49781 * 58.63871 * 27 14 13 49 49 H 1.09000 * 117.49888 * 214.99896 * 28 13 12 50 50 H 1.08993 * 117.49972 * 0.02653 * 28 13 12 51 51 H 1.09004 * 117.50108 * 359.97438 * 29 13 12 52 52 H 1.08998 * 117.49741 * 144.96895 * 29 13 12 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 1.5070 0.0000 0.0000 3 7 2.2741 1.0600 0.0000 4 7 3.6086 0.6342 -0.0006 5 1 4.3907 1.2081 -0.0011 6 6 3.6142 -0.7153 0.0044 7 6 4.8349 -1.5988 0.0107 8 6 2.3271 -1.1329 -0.0006 9 6 1.8600 -2.5657 -0.0004 10 6 1.7038 -3.0434 -1.4212 11 8 1.9483 -2.2943 -2.3431 12 7 1.2925 -4.3031 -1.6672 13 6 1.1402 -4.7673 -3.0483 14 6 0.6686 -6.2138 -3.2101 15 6 -0.3955 -6.5242 -2.1548 16 6 -0.8403 -7.9831 -2.2979 17 7 -1.2785 -8.2104 -3.6817 18 6 -2.5142 -8.7389 -3.9444 19 1 -3.3272 -8.5820 -3.2511 20 6 -2.7217 -9.4765 -5.1019 21 7 -1.6944 -9.9641 -5.7647 22 14 -4.4591 -9.7772 -5.7189 23 1 -4.8167 -8.7376 -6.7172 24 1 -4.5344 -11.1183 -6.3522 25 1 -5.4073 -9.7147 -4.5777 26 6 -0.3634 -7.8654 -4.7782 27 6 0.0740 -6.4026 -4.6075 28 6 0.6668 -3.7492 -4.0876 29 6 2.1220 -4.2241 -4.0885 30 1 -0.3634 -0.0004 1.0276 31 1 -0.3634 0.8902 -0.5135 32 1 -0.3633 -0.8898 -0.5142 33 1 5.1338 -1.8130 -1.0154 34 1 5.6489 -1.0901 0.5275 35 1 4.6054 -2.5321 0.5248 36 1 0.9014 -2.6352 0.5137 37 1 2.5936 -3.1870 0.5133 38 1 1.0973 -4.9023 -0.9298 39 1 1.5152 -6.8883 -3.0815 40 1 -1.2529 -5.8666 -2.2984 41 1 0.0212 -6.3668 -1.1600 42 1 -1.6669 -8.1815 -1.6156 43 1 -0.0054 -8.6441 -2.0657 44 1 -1.8395 -10.4792 -6.5737 45 1 0.5097 -8.5170 -4.7442 46 1 -0.8752 -7.9861 -5.7330 47 1 -0.7877 -5.7462 -4.7280 48 1 0.8252 -6.1583 -5.3586 49 1 0.0190 -4.1098 -4.8867 50 1 0.4691 -2.7339 -3.7439 51 1 2.8810 -3.5211 -3.7453 52 1 2.4319 -4.8973 -4.8878 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 ZINC001333193264.mol2 52 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Wed Apr 1 2020 03:51:21 Heat of formation + Delta-G solvation = 78.476688 kcal Electronic energy + Delta-G solvation = -31217.941569 eV Core-core repulsion = 27220.216456 eV Total energy + Delta-G solvation = -3997.725113 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 346.211 amu Computer time = 1.18 seconds Orbital eigenvalues (eV) -41.63260 -40.30153 -38.06242 -35.88813 -33.67765 -33.44855 -32.80597 -32.56397 -30.14569 -29.80440 -29.29585 -27.80966 -26.40026 -25.49454 -23.12359 -22.17694 -22.14536 -21.07364 -20.33639 -19.77452 -19.43100 -18.61612 -17.61297 -17.34494 -16.63523 -15.73096 -15.30568 -15.22985 -14.85353 -14.22734 -14.11138 -13.84855 -13.81058 -13.64427 -13.56494 -13.52554 -13.25400 -13.22106 -12.94014 -12.63959 -12.57430 -12.41366 -12.37219 -12.30705 -11.95355 -11.39868 -11.20424 -11.01896 -10.98853 -10.72606 -10.70372 -10.69468 -10.20370 -10.08567 -10.04744 -9.93656 -9.62592 -9.47486 -9.41200 -9.33105 -8.56440 -8.46144 -8.37213 -6.66977 -5.78529 -3.20534 1.65404 2.44184 2.64075 2.66175 3.29379 3.38373 3.45755 3.46618 4.20918 4.36037 4.43387 4.50195 4.70282 4.76004 4.89102 4.96918 5.02640 5.10794 5.18970 5.27532 5.30829 5.37002 5.39195 5.43431 5.47237 5.50993 5.60548 5.71701 5.73906 5.76031 5.81128 5.93508 6.03717 6.04431 6.14292 6.29713 6.32746 6.41954 6.46947 6.60365 6.61065 6.69181 6.73576 6.81840 6.83221 6.98690 7.07781 7.37816 7.50848 7.62534 7.66304 7.80475 8.33492 8.45671 9.21949 9.85594 10.42193 11.29846 Molecular weight = 346.21amu Principal moments of inertia in cm(-1) A = 0.022829 B = 0.002224 C = 0.002168 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1226.214841 B =12586.495995 C =12912.175862 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.076 4.076 2 C 0.096 3.904 3 N -0.298 5.298 4 N -0.477 5.477 5 H 0.436 0.564 6 C 0.102 3.898 7 C -0.095 4.095 8 C -0.215 4.215 9 C -0.062 4.062 10 C 0.509 3.491 11 O -0.527 6.527 12 N -0.695 5.695 13 C 0.105 3.895 14 C -0.040 4.040 15 C -0.124 4.124 16 C 0.145 3.855 17 N -0.592 5.592 18 C -0.251 4.251 19 H 0.065 0.935 20 C 0.002 3.998 21 N -0.903 5.903 22 Si 0.901 3.099 23 H -0.288 1.288 24 H -0.292 1.292 25 H -0.279 1.279 26 C 0.171 3.829 27 C -0.133 4.133 28 C -0.178 4.178 29 C -0.179 4.179 30 H 0.077 0.923 31 H 0.073 0.927 32 H 0.077 0.923 33 H 0.083 0.917 34 H 0.070 0.930 35 H 0.085 0.915 36 H 0.099 0.901 37 H 0.096 0.904 38 H 0.403 0.597 39 H 0.070 0.930 40 H 0.062 0.938 41 H 0.045 0.955 42 H 0.053 0.947 43 H 0.016 0.984 44 H 0.253 0.747 45 H 0.018 0.982 46 H 0.088 0.912 47 H 0.061 0.939 48 H 0.051 0.949 49 H 0.099 0.901 50 H 0.101 0.899 51 H 0.101 0.899 52 H 0.091 0.909 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 12.050 16.346 13.675 24.482 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 -0.134 4.134 2 C -0.071 4.071 3 N -0.122 5.122 4 N -0.185 5.185 5 H 0.280 0.720 6 C -0.027 4.027 7 C -0.153 4.153 8 C -0.226 4.226 9 C -0.103 4.103 10 C 0.295 3.705 11 O -0.403 6.403 12 N -0.346 5.346 13 C 0.018 3.982 14 C -0.060 4.060 15 C -0.164 4.164 16 C 0.019 3.981 17 N -0.314 5.314 18 C -0.381 4.381 19 H 0.083 0.917 20 C -0.197 4.197 21 N -0.547 5.547 22 Si 0.731 3.269 23 H -0.215 1.215 24 H -0.218 1.218 25 H -0.204 1.204 26 C 0.045 3.955 27 C -0.173 4.173 28 C -0.216 4.216 29 C -0.217 4.217 30 H 0.096 0.904 31 H 0.092 0.908 32 H 0.096 0.904 33 H 0.101 0.899 34 H 0.089 0.911 35 H 0.104 0.896 36 H 0.118 0.882 37 H 0.114 0.886 38 H 0.239 0.761 39 H 0.088 0.912 40 H 0.080 0.920 41 H 0.063 0.937 42 H 0.072 0.928 43 H 0.034 0.966 44 H 0.063 0.937 45 H 0.036 0.964 46 H 0.106 0.894 47 H 0.080 0.920 48 H 0.069 0.931 49 H 0.118 0.882 50 H 0.119 0.881 51 H 0.119 0.881 52 H 0.109 0.891 Dipole moment (debyes) X Y Z Total from point charges 12.227 18.035 12.893 25.318 hybrid contribution -0.406 -0.979 -0.073 1.063 sum 11.821 17.056 12.820 24.392 Atomic orbital electron populations 1.20200 0.86812 1.03666 1.02771 1.22145 0.96845 0.90096 0.98011 1.77274 0.86393 1.22253 1.26249 1.46059 1.07318 1.04715 1.60407 0.72011 1.20782 0.96782 0.84986 1.00132 1.20486 0.92832 0.98261 1.03732 1.18966 0.91283 0.94594 1.17787 1.19922 1.03462 0.92573 0.94355 1.20698 0.76844 0.81396 0.91555 1.90666 1.49139 1.54821 1.45658 1.45474 1.68100 1.13267 1.07737 1.20957 1.04293 0.94338 0.78579 1.20655 0.97716 0.89864 0.97731 1.22021 0.98067 1.00337 0.95933 1.20890 0.97079 0.91829 0.88326 1.44065 1.15667 1.72589 0.99118 1.19197 0.86498 1.26004 1.06382 0.91704 1.25035 0.97063 0.97236 1.00358 1.70037 1.28743 1.36925 1.19008 0.86295 0.84552 0.77154 0.78892 1.21478 1.21829 1.20411 1.20879 0.92602 0.88204 0.93788 1.22411 0.99369 1.01759 0.93731 1.23497 0.97201 0.99807 1.01082 1.23353 0.94190 1.03393 1.00811 0.90440 0.90792 0.90433 0.89851 0.91104 0.89623 0.88240 0.88608 0.76136 0.91185 0.91968 0.93688 0.92816 0.96573 0.93666 0.96429 0.89419 0.92041 0.93070 0.88245 0.88077 0.88058 0.89096 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 18. 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 -0.08 -0.70 10.12 36.00 0.36 -0.34 16 2 C 0.10 1.13 7.22 -82.41 -0.59 0.53 16 3 N -0.30 -3.73 12.70 33.67 0.43 -3.30 16 4 N -0.48 -4.67 7.36 33.48 0.25 -4.42 16 5 H 0.44 2.84 8.96 -182.60 -1.64 1.20 16 6 C 0.10 0.97 7.21 -82.27 -0.59 0.38 16 7 C -0.09 -0.58 10.22 36.00 0.37 -0.22 16 8 C -0.21 -2.29 4.59 -105.06 -0.48 -2.77 16 9 C -0.06 -0.54 5.64 -29.04 -0.16 -0.70 16 10 C 0.51 6.04 7.53 -10.98 -0.08 5.96 16 11 O -0.53 -8.13 11.51 5.55 0.06 -8.06 16 12 N -0.70 -8.05 5.39 -47.61 -0.26 -8.31 16 13 C 0.11 1.49 2.98 -131.82 -0.39 1.10 16 14 C -0.04 -0.63 2.45 -90.58 -0.22 -0.86 16 15 C -0.12 -1.95 5.02 -26.61 -0.13 -2.09 16 16 C 0.15 2.87 6.51 -3.71 -0.02 2.84 16 17 N -0.59 -14.34 2.99 -172.06 -0.51 -14.85 16 18 C -0.25 -6.76 9.58 -15.06 -0.14 -6.91 16 19 H 0.07 1.72 7.89 -52.49 -0.41 1.31 16 20 C 0.00 0.04 4.90 -17.43 -0.09 -0.04 16 21 N -0.90 -25.90 11.22 55.49 0.62 -25.28 16 22 Si 0.90 21.53 29.59 -169.99 -5.03 16.50 16 23 H -0.29 -6.89 7.11 56.52 0.40 -6.49 16 24 H -0.29 -7.05 7.11 56.52 0.40 -6.65 16 25 H -0.28 -6.51 7.11 56.52 0.40 -6.11 16 26 C 0.17 3.95 5.34 -3.48 -0.02 3.94 16 27 C -0.13 -2.44 4.02 -26.38 -0.11 -2.54 16 28 C -0.18 -2.72 8.84 -26.69 -0.24 -2.96 16 29 C -0.18 -2.62 9.06 -26.69 -0.24 -2.86 16 30 H 0.08 0.56 8.14 -51.93 -0.42 0.14 16 31 H 0.07 0.68 8.14 -51.93 -0.42 0.26 16 32 H 0.08 0.71 7.92 -51.93 -0.41 0.30 16 33 H 0.08 0.57 8.14 -51.93 -0.42 0.15 16 34 H 0.07 0.29 8.14 -51.93 -0.42 -0.13 16 35 H 0.09 0.43 7.14 -51.93 -0.37 0.06 16 36 H 0.10 0.70 7.92 -51.93 -0.41 0.28 16 37 H 0.10 0.60 7.14 -51.93 -0.37 0.23 16 38 H 0.40 3.77 6.81 -40.82 -0.28 3.49 16 39 H 0.07 1.12 8.14 -51.93 -0.42 0.70 16 40 H 0.06 1.06 8.14 -51.92 -0.42 0.63 16 41 H 0.04 0.56 6.41 -51.93 -0.33 0.22 16 42 H 0.05 1.04 7.93 -51.93 -0.41 0.63 16 43 H 0.02 0.32 8.14 -51.93 -0.42 -0.10 16 44 H 0.25 7.04 8.31 -40.82 -0.34 6.70 16 45 H 0.02 0.43 8.14 -51.93 -0.42 0.01 16 46 H 0.09 2.30 6.06 -51.93 -0.31 1.98 16 47 H 0.06 1.18 6.84 -51.93 -0.36 0.82 16 48 H 0.05 0.87 6.87 -51.93 -0.36 0.51 16 49 H 0.10 1.55 5.91 -51.93 -0.31 1.25 16 50 H 0.10 1.67 6.38 -51.93 -0.33 1.34 16 51 H 0.10 1.57 6.37 -51.93 -0.33 1.24 16 52 H 0.09 1.29 7.27 -51.93 -0.38 0.91 16 LS Contribution 400.57 15.07 6.04 6.04 Total: -1.00 -33.61 400.57 -10.72 -44.33 By element: Atomic # 1 Polarization: 14.42 SS G_CDS: -9.53 Total: 4.89 kcal Atomic # 6 Polarization: -4.74 SS G_CDS: -2.79 Total: -7.53 kcal Atomic # 7 Polarization: -56.69 SS G_CDS: 0.53 Total: -56.16 kcal Atomic # 8 Polarization: -8.13 SS G_CDS: 0.06 Total: -8.06 kcal Atomic # 14 Polarization: 21.53 SS G_CDS: -5.03 Total: 16.50 kcal Total LS contribution 6.04 Total: 6.04 kcal Total: -33.61 -10.72 -44.33 kcal The number of atoms in the molecule is 52 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. ZINC001333193264.mol2 52 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 122.805 kcal (2) G-P(sol) polarization free energy of solvation -33.608 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 89.197 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.721 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -44.328 kcal (6) G-S(sol) free energy of system = (1) + (5) 78.477 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.19 seconds