Wall clock time and date at job start Sat Apr 11 2020 06:11:14 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 O 1.42902 * 1 3 3 C 1.42898 * 114.00250 * 2 1 4 4 C 1.52995 * 109.47459 * 180.02562 * 3 2 1 5 5 C 1.52991 * 109.47348 * 180.02562 * 4 3 2 6 6 N 1.46902 * 109.47574 * 185.55880 * 5 4 3 7 7 C 1.46904 * 110.99435 * 300.92442 * 6 5 4 8 8 C 1.52995 * 109.47194 * 289.40142 * 7 6 5 9 9 O 1.42904 * 109.46936 * 66.85849 * 8 7 6 10 10 C 1.42900 * 114.00262 * 180.02562 * 9 8 7 11 11 C 1.38579 * 111.00606 * 176.96977 * 6 5 4 12 12 N 1.31215 * 126.46861 * 359.97392 * 11 6 5 13 13 N 1.28530 * 109.86127 * 179.97438 * 12 11 6 14 14 C 1.30304 * 110.05143 * 0.02562 * 13 12 11 15 15 C 1.50698 * 126.34666 * 179.97438 * 14 13 12 16 16 C 1.53003 * 109.46926 * 118.38198 * 15 14 13 17 17 C 1.52993 * 109.47255 * 358.38505 * 15 14 13 18 18 C 1.50697 * 109.46953 * 238.37664 * 15 14 13 19 19 H 1.07998 * 120.00317 * 3.56674 * 18 15 14 20 20 C 1.37885 * 119.99636 * 183.83751 * 18 15 14 21 21 N 1.31509 * 120.00035 * 353.21458 * 20 18 15 22 22 Si 1.86800 * 119.99641 * 173.21816 * 20 18 15 23 23 H 1.48499 * 109.47316 * 94.99528 * 22 20 18 24 24 H 1.48502 * 109.46942 * 214.99382 * 22 20 18 25 25 H 1.48498 * 109.47356 * 334.98842 * 22 20 18 26 26 N 1.36450 * 126.47433 * 180.28320 * 11 6 5 27 27 C 1.46496 * 127.13911 * 0.02562 * 26 11 6 28 28 H 1.08999 * 109.47297 * 179.97438 * 1 2 3 29 29 H 1.09002 * 109.47253 * 300.00206 * 1 2 3 30 30 H 1.09002 * 109.47347 * 59.99603 * 1 2 3 31 31 H 1.08998 * 109.47094 * 59.99986 * 3 2 1 32 32 H 1.08999 * 109.47179 * 300.00182 * 3 2 1 33 33 H 1.08998 * 109.47091 * 59.99847 * 4 3 2 34 34 H 1.08999 * 109.46961 * 300.00178 * 4 3 2 35 35 H 1.09003 * 109.47437 * 65.55781 * 5 4 3 36 36 H 1.09008 * 109.47175 * 305.55664 * 5 4 3 37 37 H 1.08998 * 109.47521 * 49.40862 * 7 6 5 38 38 H 1.08999 * 109.47089 * 169.40707 * 7 6 5 39 39 H 1.09001 * 109.47337 * 186.85619 * 8 7 6 40 40 H 1.09003 * 109.47535 * 306.86081 * 8 7 6 41 41 H 1.08994 * 109.47405 * 59.99400 * 10 9 8 42 42 H 1.08997 * 109.47522 * 179.97438 * 10 9 8 43 43 H 1.09006 * 109.47001 * 299.99767 * 10 9 8 44 44 H 1.09000 * 109.47207 * 186.60587 * 16 15 14 45 45 H 1.09004 * 109.47125 * 306.60435 * 16 15 14 46 46 H 1.09003 * 109.47232 * 66.60144 * 16 15 14 47 47 H 1.09007 * 109.46911 * 304.17222 * 17 15 14 48 48 H 1.08994 * 109.47681 * 64.17550 * 17 15 14 49 49 H 1.09001 * 109.47374 * 184.17977 * 17 15 14 50 50 H 0.97001 * 120.00004 * 179.97438 * 21 20 18 51 51 H 1.08998 * 109.47298 * 274.62894 * 27 26 11 52 52 H 1.08998 * 109.47197 * 34.62604 * 27 26 11 53 53 H 1.09004 * 109.47397 * 154.62712 * 27 26 11 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 8 1.4290 0.0000 0.0000 3 6 2.0103 1.3054 0.0000 4 6 3.5355 1.1846 -0.0006 5 6 4.1578 2.5823 0.0000 6 7 5.6162 2.4691 -0.1348 7 6 6.1867 1.6793 0.9647 8 6 6.1025 2.4805 2.2654 9 8 4.7322 2.6420 2.6375 10 6 4.5411 3.3811 3.8454 11 6 6.2071 3.7205 -0.2059 12 7 5.5902 4.8779 -0.1635 13 7 6.4460 5.8325 -0.2549 14 6 7.6497 5.3448 -0.3607 15 6 8.9258 6.1360 -0.4897 16 6 9.8344 5.8364 0.7043 17 6 8.5986 7.6302 -0.5192 18 6 9.6292 5.7503 -1.7654 19 1 9.1682 5.0495 -2.4456 20 6 10.8640 6.2877 -2.0613 21 7 11.3682 7.2350 -1.3011 22 14 11.8206 5.6704 -3.5423 23 1 11.5522 6.5512 -4.7073 24 1 13.2733 5.6855 -3.2346 25 1 11.3970 4.2835 -3.8622 26 7 7.5397 3.9820 -0.3392 27 6 8.6273 3.0053 -0.4358 28 1 -0.3634 -1.0276 -0.0005 29 1 -0.3634 0.5139 0.8900 30 1 -0.3634 0.5139 -0.8899 31 1 1.6887 1.8463 0.8900 32 1 1.6887 1.8464 -0.8900 33 1 3.8567 0.6439 -0.8908 34 1 3.8574 0.6435 0.8891 35 1 3.9175 3.0866 0.9360 36 1 3.7593 3.1578 -0.8356 37 1 5.6270 0.7503 1.0733 38 1 7.2297 1.4514 0.7453 39 1 6.6330 1.9483 3.0549 40 1 6.5570 3.4603 2.1187 41 1 4.9632 4.3795 3.7312 42 1 3.4751 3.4600 4.0585 43 1 5.0394 2.8680 4.6680 44 1 10.7034 6.4936 0.6735 45 1 9.2846 6.0043 1.6305 46 1 10.1624 4.7979 0.6598 47 1 7.8926 7.8317 -1.3250 48 1 8.1571 7.9245 0.4328 49 1 9.5131 8.1992 -0.6869 50 1 12.2370 7.6128 -1.5091 51 1 8.9420 2.7116 0.5656 52 1 8.2796 2.1269 -0.9795 53 1 9.4696 3.4506 -0.9654 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 ZINC001338246198.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 06:11:14 Heat of formation + Delta-G solvation = 0.562287 kcal Electronic energy + Delta-G solvation = -32177.900102 eV Core-core repulsion = 28087.254977 eV Total energy + Delta-G solvation = -4090.645125 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.226 amu Computer time = 0.77 seconds Orbital eigenvalues (eV) -42.27886 -39.07211 -37.98933 -36.77039 -35.67375 -34.10636 -32.41922 -31.42764 -30.02268 -27.89505 -27.13549 -26.90191 -26.19796 -25.72113 -25.33854 -24.47834 -23.19105 -21.84107 -21.11524 -19.83553 -18.89351 -17.05137 -16.98628 -16.58874 -16.41899 -16.28643 -16.09108 -15.34021 -15.31621 -15.07275 -14.89983 -14.71719 -14.26628 -13.99759 -13.46837 -13.17824 -13.03117 -12.66658 -12.46532 -12.40797 -12.16204 -11.96344 -11.82034 -11.71848 -11.63958 -11.41450 -11.26321 -11.15656 -11.11312 -10.88710 -10.80016 -10.76273 -10.55226 -10.30589 -10.16239 -9.90302 -9.84694 -9.80401 -9.48114 -9.42313 -9.15356 -8.86754 -8.47695 -7.52847 -6.16501 -4.27475 2.55581 2.88621 3.19072 3.27558 3.29329 3.57445 3.60470 3.71514 4.17283 4.28310 4.78429 4.90135 4.94460 4.99500 5.06564 5.08291 5.14057 5.20671 5.22958 5.28611 5.29204 5.32517 5.34352 5.40947 5.45736 5.53089 5.57995 5.60577 5.62781 5.75760 5.88963 5.94890 6.00405 6.09281 6.23679 6.44012 6.56208 6.66088 6.73327 6.81232 6.95710 6.97726 7.02008 7.06719 7.26861 7.31745 7.49207 7.56432 7.81160 7.89899 8.04309 8.21110 8.69805 9.37799 9.65676 10.84656 Molecular weight = 340.23amu Principal moments of inertia in cm(-1) A = 0.016901 B = 0.002982 C = 0.002805 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1656.276793 B = 9388.753971 C = 9978.200414 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.033 3.967 2 O -0.394 6.394 3 C 0.066 3.934 4 C -0.113 4.113 5 C 0.070 3.930 6 N -0.443 5.443 7 C 0.046 3.954 8 C 0.028 3.972 9 O -0.378 6.378 10 C 0.031 3.969 11 C 0.323 3.677 12 N -0.327 5.327 13 N -0.314 5.314 14 C 0.244 3.756 15 C 0.145 3.855 16 C -0.128 4.128 17 C -0.117 4.117 18 C -0.515 4.515 19 H 0.056 0.944 20 C 0.074 3.926 21 N -0.877 5.877 22 Si 0.893 3.107 23 H -0.280 1.280 24 H -0.284 1.284 25 H -0.274 1.274 26 N -0.476 5.476 27 C 0.073 3.927 28 H 0.083 0.917 29 H 0.040 0.960 30 H 0.040 0.960 31 H 0.051 0.949 32 H 0.050 0.950 33 H 0.074 0.926 34 H 0.074 0.926 35 H 0.084 0.916 36 H 0.080 0.920 37 H 0.102 0.898 38 H 0.095 0.905 39 H 0.054 0.946 40 H 0.052 0.948 41 H 0.042 0.958 42 H 0.085 0.915 43 H 0.038 0.962 44 H 0.092 0.908 45 H 0.011 0.989 46 H 0.030 0.970 47 H 0.034 0.966 48 H 0.016 0.984 49 H 0.089 0.911 50 H 0.264 0.736 51 H 0.063 0.937 52 H 0.077 0.923 53 H 0.117 0.883 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -11.498 -13.210 7.704 19.132 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 -0.064 4.064 2 O -0.313 6.313 3 C -0.011 4.011 4 C -0.151 4.151 5 C -0.057 4.057 6 N -0.166 5.166 7 C -0.082 4.082 8 C -0.050 4.050 9 O -0.297 6.297 10 C -0.066 4.066 11 C -0.034 4.034 12 N -0.171 5.171 13 N -0.151 5.151 14 C -0.024 4.024 15 C 0.142 3.858 16 C -0.186 4.186 17 C -0.175 4.175 18 C -0.554 4.554 19 H 0.075 0.925 20 C -0.129 4.129 21 N -0.514 5.514 22 Si 0.721 3.279 23 H -0.206 1.206 24 H -0.210 1.210 25 H -0.198 1.198 26 N -0.170 5.170 27 C -0.070 4.070 28 H 0.102 0.898 29 H 0.058 0.942 30 H 0.059 0.941 31 H 0.070 0.930 32 H 0.068 0.932 33 H 0.093 0.907 34 H 0.092 0.908 35 H 0.102 0.898 36 H 0.099 0.901 37 H 0.121 0.879 38 H 0.113 0.887 39 H 0.072 0.928 40 H 0.071 0.929 41 H 0.060 0.940 42 H 0.103 0.897 43 H 0.056 0.944 44 H 0.110 0.890 45 H 0.030 0.970 46 H 0.049 0.951 47 H 0.053 0.947 48 H 0.035 0.965 49 H 0.107 0.893 50 H 0.074 0.926 51 H 0.082 0.918 52 H 0.096 0.904 53 H 0.136 0.864 Dipole moment (debyes) X Y Z Total from point charges -12.412 -12.595 7.253 19.113 hybrid contribution 1.452 -0.658 -0.106 1.598 sum -10.959 -13.253 7.147 18.623 Atomic orbital electron populations 1.22713 0.81227 1.02498 0.99980 1.87848 1.19527 1.28419 1.95459 1.22415 0.93966 0.84260 1.00425 1.21499 0.92712 0.97426 1.03452 1.22072 0.83100 0.96405 1.04127 1.58818 1.06623 1.09026 1.42090 1.22658 1.01866 0.97375 0.86328 1.23299 0.84060 1.00142 0.97512 1.87916 1.24602 1.75416 1.41748 1.22722 1.02136 0.95391 0.86332 1.22292 0.82324 0.92198 1.06565 1.74445 1.25727 0.94365 1.22541 1.73983 0.97318 1.22578 1.21238 1.26016 0.98726 0.79268 0.98400 1.16889 0.82480 0.90912 0.95489 1.21846 1.01378 1.00693 0.94697 1.21635 1.01623 0.96394 0.97853 1.20884 1.02739 1.27304 1.04435 0.92539 1.24848 0.97271 0.94332 0.96494 1.69830 1.18291 1.24848 1.38422 0.86556 0.79185 0.79373 0.82821 1.20566 1.20986 1.19849 1.45948 1.06127 1.08409 1.56539 1.22210 0.90596 0.91717 1.02506 0.89832 0.94151 0.94120 0.93036 0.93194 0.90746 0.90750 0.89789 0.90136 0.87949 0.88722 0.92770 0.92936 0.93953 0.89673 0.94365 0.88973 0.96992 0.95106 0.94674 0.96460 0.89260 0.92604 0.91823 0.90450 0.86449 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 0.03 0.26 11.01 101.05 1.11 1.37 16 2 O -0.39 -4.47 10.70 -35.23 -0.38 -4.85 16 3 C 0.07 0.71 5.94 37.16 0.22 0.93 16 4 C -0.11 -1.30 5.18 -26.74 -0.14 -1.44 16 5 C 0.07 0.97 3.90 -3.83 -0.01 0.96 16 6 N -0.44 -6.69 4.83 -174.51 -0.84 -7.53 16 7 C 0.05 0.55 5.48 -3.82 -0.02 0.53 16 8 C 0.03 0.36 5.79 37.16 0.21 0.58 16 9 O -0.38 -4.87 7.61 -35.23 -0.27 -5.14 16 10 C 0.03 0.33 11.01 101.05 1.11 1.45 16 11 C 0.32 6.10 5.39 -318.88 -1.72 4.38 16 12 N -0.33 -7.16 11.30 30.31 0.34 -6.82 16 13 N -0.31 -7.53 11.49 32.99 0.38 -7.15 16 14 C 0.24 5.56 6.28 -154.01 -0.97 4.59 16 15 C 0.15 3.43 0.51 -156.82 -0.08 3.35 16 16 C -0.13 -2.82 7.95 37.16 0.30 -2.52 16 17 C -0.12 -2.85 7.84 37.15 0.29 -2.56 16 18 C -0.51 -12.84 6.24 -34.44 -0.21 -13.06 16 19 H 0.06 1.45 7.51 -52.49 -0.39 1.06 16 20 C 0.07 1.83 5.12 -17.82 -0.09 1.74 16 21 N -0.88 -22.28 9.45 55.43 0.52 -21.76 16 22 Si 0.89 19.62 29.54 -169.99 -5.02 14.60 16 23 H -0.28 -6.30 7.11 56.52 0.40 -5.89 16 24 H -0.28 -6.20 7.11 56.52 0.40 -5.79 16 25 H -0.27 -5.93 7.11 56.52 0.40 -5.53 16 26 N -0.48 -9.27 3.21 -121.46 -0.39 -9.66 16 27 C 0.07 1.15 8.18 59.84 0.49 1.64 16 28 H 0.08 0.54 8.14 -51.93 -0.42 0.12 16 29 H 0.04 0.29 8.14 -51.93 -0.42 -0.14 16 30 H 0.04 0.29 8.14 -51.93 -0.42 -0.13 16 31 H 0.05 0.53 8.14 -51.93 -0.42 0.11 16 32 H 0.05 0.51 8.14 -51.93 -0.42 0.09 16 33 H 0.07 0.88 8.14 -51.93 -0.42 0.46 16 34 H 0.07 0.84 6.47 -51.93 -0.34 0.50 16 35 H 0.08 1.27 5.37 -51.93 -0.28 0.99 16 36 H 0.08 1.24 8.02 -51.92 -0.42 0.82 16 37 H 0.10 1.06 5.89 -51.93 -0.31 0.76 16 38 H 0.09 1.04 5.74 -51.93 -0.30 0.74 16 39 H 0.05 0.58 8.14 -51.93 -0.42 0.16 16 40 H 0.05 0.85 6.80 -51.93 -0.35 0.49 16 41 H 0.04 0.52 8.14 -51.93 -0.42 0.09 16 42 H 0.08 0.78 8.14 -51.93 -0.42 0.36 16 43 H 0.04 0.35 8.14 -51.93 -0.42 -0.07 16 44 H 0.09 2.19 6.25 -51.93 -0.32 1.86 16 45 H 0.01 0.24 8.14 -51.93 -0.42 -0.19 16 46 H 0.03 0.62 6.65 -51.93 -0.35 0.28 16 47 H 0.03 0.87 8.13 -51.92 -0.42 0.45 16 48 H 0.02 0.39 8.14 -51.93 -0.42 -0.04 16 49 H 0.09 2.28 6.04 -51.93 -0.31 1.96 16 50 H 0.26 6.44 8.31 -40.82 -0.34 6.10 16 51 H 0.06 0.84 7.77 -51.93 -0.40 0.44 16 52 H 0.08 1.05 7.76 -51.93 -0.40 0.65 16 53 H 0.12 2.09 5.65 -51.93 -0.29 1.79 16 LS Contribution 405.31 15.07 6.11 6.11 Total: -1.00 -29.59 405.31 -8.15 -37.74 By element: Atomic # 1 Polarization: 11.60 SS G_CDS: -9.10 Total: 2.51 kcal Atomic # 6 Polarization: 1.46 SS G_CDS: 0.49 Total: 1.95 kcal Atomic # 7 Polarization: -52.93 SS G_CDS: 0.01 Total: -52.92 kcal Atomic # 8 Polarization: -9.34 SS G_CDS: -0.65 Total: -9.99 kcal Atomic # 14 Polarization: 19.62 SS G_CDS: -5.02 Total: 14.60 kcal Total LS contribution 6.11 Total: 6.11 kcal Total: -29.59 -8.15 -37.74 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. ZINC001338246198.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 38.307 kcal (2) G-P(sol) polarization free energy of solvation -29.594 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 8.713 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -8.150 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -37.744 kcal (6) G-S(sol) free energy of system = (1) + (5) 0.562 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.77 seconds