Wall clock time and date at job start Sat Apr 11 2020 04:55:32 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 1.53000 * 1 3 3 C 1.53002 * 109.46893 * 2 1 4 4 C 1.53004 * 109.47157 * 119.99559 * 2 1 3 5 5 C 1.50699 * 109.47307 * 174.41843 * 4 2 1 6 6 N 1.30292 * 126.35015 * 276.81582 * 5 4 2 7 7 N 1.28525 * 110.05530 * 179.69097 * 6 5 4 8 8 C 1.31224 * 109.85664 * 0.45224 * 7 6 5 9 9 N 1.38573 * 126.46825 * 179.82196 * 8 7 6 10 10 C 1.46902 * 111.00177 * 108.28504 * 9 8 7 11 11 C 1.46899 * 111.00436 * 344.33369 * 9 8 7 12 12 H 1.08994 * 109.47231 * 59.99507 * 11 9 8 13 13 C 1.53004 * 109.46935 * 299.99830 * 11 9 8 14 14 C 1.50703 * 109.47576 * 180.02562 * 11 9 8 15 15 H 1.07999 * 119.99819 * 359.97438 * 14 11 9 16 16 C 1.37878 * 120.00141 * 179.97438 * 14 11 9 17 17 N 1.31510 * 119.99849 * 0.02562 * 16 14 11 18 18 Si 1.86795 * 119.99733 * 179.97438 * 16 14 11 19 19 H 1.48497 * 109.47461 * 0.02562 * 18 16 14 20 20 H 1.48505 * 109.46851 * 120.00320 * 18 16 14 21 21 H 1.48500 * 109.47285 * 239.99976 * 18 16 14 22 22 N 1.36450 * 107.05534 * 359.56138 * 8 7 6 23 23 C 1.46498 * 127.13624 * 180.24398 * 22 8 7 24 24 C 1.53001 * 109.47065 * 271.80461 * 23 22 8 25 25 C 1.53000 * 113.00125 * 50.71866 * 24 23 22 26 26 C 1.54031 * 113.81538 * 278.73174 * 24 23 22 27 27 O 1.44178 * 85.51905 * 223.19754 * 26 24 23 28 28 C 1.44174 * 93.34018 * 24.19358 * 27 26 24 29 29 H 1.08998 * 109.47512 * 300.00326 * 1 2 3 30 30 H 1.09003 * 109.46762 * 60.00721 * 1 2 3 31 31 H 1.09004 * 109.47005 * 180.02562 * 1 2 3 32 32 H 1.08998 * 109.47512 * 239.99674 * 2 1 3 33 33 H 1.09002 * 109.47008 * 303.42279 * 3 2 1 34 34 H 1.08994 * 109.47343 * 63.42535 * 3 2 1 35 35 H 1.09005 * 109.46971 * 183.43050 * 3 2 1 36 36 H 1.09001 * 109.46791 * 54.41382 * 4 2 1 37 37 H 1.09005 * 109.47135 * 294.42222 * 4 2 1 38 38 H 1.09002 * 109.47387 * 291.81906 * 10 9 8 39 39 H 1.09004 * 109.46517 * 51.81537 * 10 9 8 40 40 H 1.08996 * 109.47523 * 171.81405 * 10 9 8 41 41 H 1.09001 * 109.47026 * 59.99700 * 13 11 9 42 42 H 1.09000 * 109.47403 * 179.97438 * 13 11 9 43 43 H 1.09002 * 109.47220 * 300.00431 * 13 11 9 44 44 H 0.97004 * 120.00076 * 179.97438 * 17 16 14 45 45 H 1.09007 * 109.47003 * 31.80274 * 23 22 8 46 46 H 1.08995 * 109.47449 * 151.80289 * 23 22 8 47 47 H 1.09003 * 109.46996 * 63.74855 * 25 24 23 48 48 H 1.08994 * 109.47354 * 183.75242 * 25 24 23 49 49 H 1.09004 * 109.47111 * 303.75290 * 25 24 23 50 50 H 1.09007 * 113.86748 * 337.34607 * 26 24 23 51 51 H 1.09002 * 113.86327 * 109.04904 * 26 24 23 52 52 H 1.09000 * 113.86728 * 221.66089 * 28 27 26 53 53 H 1.08997 * 113.86732 * 89.95529 * 28 27 26 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 2.0399 1.4425 0.0000 4 6 2.0400 -0.7212 1.2493 5 6 3.5407 -0.8420 1.1822 6 7 4.2139 -1.7602 0.5488 7 7 5.4753 -1.5611 0.6944 8 6 5.6760 -0.5019 1.4426 9 7 6.9032 0.0196 1.8198 10 6 7.1779 1.2801 1.1173 11 6 7.9803 -0.9537 1.5952 12 1 8.0210 -1.2130 0.5373 13 6 7.7088 -2.2141 2.4191 14 6 9.2965 -0.3526 2.0166 15 1 9.3295 0.6521 2.4114 16 6 10.4584 -1.0854 1.8982 17 7 10.4182 -2.3086 1.4170 18 14 12.0898 -0.3400 2.4199 19 1 11.8656 1.0389 2.9234 20 1 12.6906 -1.1680 3.4965 21 1 13.0102 -0.2987 1.2553 22 7 4.4481 -0.0077 1.7742 23 6 4.1615 1.1717 2.5945 24 6 4.0932 0.7640 4.0676 25 6 5.3064 -0.0518 4.5189 26 6 2.7410 0.1540 4.4822 27 8 2.8619 0.9728 5.6628 28 6 3.7342 1.9222 5.0176 29 1 -0.3634 0.5139 0.8899 30 1 -0.3633 0.5137 -0.8901 31 1 -0.3633 -1.0277 0.0005 32 1 1.8934 -0.5139 -0.8899 33 1 1.6273 1.9738 -0.8577 34 1 1.7276 1.9383 0.9190 35 1 3.1283 1.4432 -0.0615 36 1 1.5973 -1.7159 1.3008 37 1 1.7605 -0.1528 2.1365 38 1 7.3335 1.0790 0.0574 39 1 6.3309 1.9555 1.2384 40 1 8.0729 1.7413 1.5349 41 1 6.7568 -2.6490 2.1147 42 1 8.5078 -2.9364 2.2521 43 1 7.6680 -1.9548 3.4770 44 1 11.2357 -2.8240 1.3333 45 1 4.9518 1.9100 2.4580 46 1 3.2066 1.6015 2.2919 47 1 6.2048 0.5608 4.4429 48 1 5.1679 -0.3670 5.5531 49 1 5.4107 -0.9303 3.8822 50 1 1.9122 0.4363 3.8328 51 1 2.7829 -0.9167 4.6818 52 1 4.5639 2.2539 5.6418 53 1 3.2088 2.7444 4.5317 RHF calculation, no. of doubly occupied orbitals= 65 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 ZINC001417459667.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 04:55:32 Heat of formation + Delta-G solvation = 74.184075 kcal Electronic energy + Delta-G solvation = -32274.748503 eV Core-core repulsion = 28377.751910 eV Total energy + Delta-G solvation = -3896.996593 eV No. of doubly occupied orbitals = 65 Molecular weight (most abundant/longest-lived isotopes) = 336.227 amu Computer time = 0.87 seconds Orbital eigenvalues (eV) -42.65378 -40.74880 -37.33201 -36.51952 -35.10695 -32.86952 -31.64355 -30.29756 -29.24360 -27.73456 -27.29922 -26.99391 -26.73790 -25.38195 -25.18999 -24.27725 -21.93836 -21.07236 -20.24938 -19.30743 -18.86283 -17.12232 -16.71533 -16.26003 -16.13778 -15.86527 -15.51603 -15.26521 -14.95101 -14.59513 -14.42477 -14.22727 -13.76091 -13.54528 -13.41257 -13.05765 -12.78219 -12.53004 -12.46204 -12.29383 -12.13182 -12.07524 -11.92064 -11.63768 -11.44375 -11.26883 -11.14250 -11.04367 -10.95208 -10.86570 -10.81634 -10.74893 -10.55491 -10.33906 -10.21168 -10.07632 -9.92208 -9.81682 -9.48742 -9.22416 -8.61367 -8.45166 -7.41784 -6.05647 -4.13197 2.21797 2.61908 3.26152 3.34283 3.36399 3.40355 3.46646 3.92875 4.31028 4.40831 4.45340 4.55955 4.59995 4.65949 4.71709 4.83307 4.94133 5.01583 5.08244 5.17023 5.24389 5.27226 5.37091 5.38656 5.43033 5.57514 5.59733 5.63771 5.66411 5.72058 5.78399 5.87848 5.88275 5.92684 6.01140 6.04893 6.07217 6.09119 6.13581 6.27735 6.36698 6.47296 6.55592 6.91320 6.97442 7.15320 7.24895 7.44007 7.69900 7.73532 7.95919 8.25031 8.44808 8.89208 9.37802 9.51831 11.00639 Molecular weight = 336.23amu Principal moments of inertia in cm(-1) A = 0.013550 B = 0.003991 C = 0.003454 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2065.977853 B = 7013.264052 C = 8104.765561 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.145 4.145 2 C -0.092 4.092 3 C -0.149 4.149 4 C -0.023 4.023 5 C 0.154 3.846 6 N -0.286 5.286 7 N -0.316 5.316 8 C 0.386 3.614 9 N -0.456 5.456 10 C 0.042 3.958 11 C 0.231 3.769 12 H 0.023 0.977 13 C -0.134 4.134 14 C -0.515 4.515 15 H 0.064 0.936 16 C 0.064 3.936 17 N -0.883 5.883 18 Si 0.898 3.102 19 H -0.273 1.273 20 H -0.284 1.284 21 H -0.284 1.284 22 N -0.478 5.478 23 C 0.117 3.883 24 C -0.138 4.138 25 C -0.123 4.123 26 C 0.040 3.960 27 O -0.375 6.375 28 C 0.048 3.952 29 H 0.054 0.946 30 H 0.056 0.944 31 H 0.058 0.942 32 H 0.080 0.920 33 H 0.057 0.943 34 H 0.052 0.948 35 H 0.052 0.948 36 H 0.094 0.906 37 H 0.075 0.925 38 H 0.032 0.968 39 H 0.042 0.958 40 H 0.092 0.908 41 H 0.025 0.975 42 H 0.087 0.913 43 H 0.025 0.975 44 H 0.262 0.738 45 H 0.100 0.900 46 H 0.092 0.908 47 H 0.079 0.921 48 H 0.057 0.943 49 H 0.069 0.931 50 H 0.080 0.920 51 H 0.092 0.908 52 H 0.097 0.903 53 H 0.080 0.920 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -18.430 10.008 2.355 21.104 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 -0.203 4.203 2 C -0.112 4.112 3 C -0.207 4.207 4 C -0.063 4.063 5 C -0.113 4.113 6 N -0.126 5.126 7 N -0.160 5.160 8 C 0.031 3.969 9 N -0.181 5.181 10 C -0.105 4.105 11 C 0.127 3.873 12 H 0.040 0.960 13 C -0.192 4.192 14 C -0.554 4.554 15 H 0.082 0.918 16 C -0.138 4.138 17 N -0.521 5.521 18 Si 0.726 3.274 19 H -0.198 1.198 20 H -0.210 1.210 21 H -0.211 1.211 22 N -0.174 5.174 23 C -0.007 4.007 24 C -0.139 4.139 25 C -0.180 4.180 26 C -0.036 4.036 27 O -0.294 6.294 28 C -0.030 4.030 29 H 0.073 0.927 30 H 0.075 0.925 31 H 0.077 0.923 32 H 0.099 0.901 33 H 0.076 0.924 34 H 0.071 0.929 35 H 0.072 0.928 36 H 0.113 0.887 37 H 0.093 0.907 38 H 0.051 0.949 39 H 0.061 0.939 40 H 0.111 0.889 41 H 0.044 0.956 42 H 0.106 0.894 43 H 0.044 0.956 44 H 0.072 0.928 45 H 0.118 0.882 46 H 0.110 0.890 47 H 0.098 0.902 48 H 0.076 0.924 49 H 0.087 0.913 50 H 0.098 0.902 51 H 0.110 0.890 52 H 0.115 0.885 53 H 0.098 0.902 Dipole moment (debyes) X Y Z Total from point charges -18.072 8.711 2.220 20.185 hybrid contribution 0.882 1.346 0.228 1.625 sum -17.190 10.057 2.447 20.066 Atomic orbital electron populations 1.21825 0.94574 1.02064 1.01807 1.21130 0.95655 0.96136 0.98284 1.21934 1.01213 0.95992 1.01518 1.20094 0.84898 1.02651 0.98657 1.24364 0.94303 0.91736 1.00907 1.73951 0.98870 1.20468 1.19274 1.74844 1.07757 1.16512 1.16905 1.23061 0.86152 0.93438 0.94256 1.59217 0.98234 1.07461 1.53224 1.22296 1.01322 0.89888 0.97015 1.19326 0.84873 0.86974 0.96153 0.95957 1.21835 1.00308 0.99484 0.97564 1.21081 0.90256 1.00756 1.43274 0.91773 1.24891 0.99055 0.94829 0.95074 1.69931 1.27895 1.09379 1.44859 0.86451 0.83553 0.79194 0.78223 1.19784 1.20989 1.21059 1.46118 1.06138 1.24166 1.40936 1.21967 1.03253 0.86398 0.89085 1.24102 0.98089 0.97473 0.94268 1.21550 0.95161 1.00456 1.00809 1.24202 0.95581 0.97494 0.86359 1.89687 1.69898 1.39104 1.30675 1.24031 0.93355 0.92246 0.93361 0.92706 0.92451 0.92290 0.90131 0.92386 0.92895 0.92846 0.88747 0.90681 0.94924 0.93944 0.88929 0.95605 0.89431 0.95596 0.92816 0.88185 0.89024 0.90240 0.92390 0.91255 0.90248 0.89017 0.88483 0.90155 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 -1.02 9.19 37.16 0.34 -0.68 16 2 C -0.09 -0.86 2.90 -90.62 -0.26 -1.12 16 3 C -0.15 -1.32 8.02 37.16 0.30 -1.02 16 4 C -0.02 -0.24 4.97 -27.88 -0.14 -0.38 16 5 C 0.15 2.34 6.42 -154.02 -0.99 1.35 16 6 N -0.29 -5.65 12.18 32.99 0.40 -5.25 16 7 N -0.32 -7.06 9.73 30.31 0.29 -6.76 16 8 C 0.39 7.51 4.47 -318.88 -1.42 6.09 16 9 N -0.46 -9.25 4.21 -176.08 -0.74 -9.99 16 10 C 0.04 0.75 8.99 60.07 0.54 1.29 16 11 C 0.23 5.74 1.72 -68.86 -0.12 5.62 16 12 H 0.02 0.65 7.95 -51.93 -0.41 0.23 16 13 C -0.13 -3.39 8.79 37.16 0.33 -3.06 16 14 C -0.52 -13.38 7.97 -34.44 -0.27 -13.66 16 15 H 0.06 1.61 6.40 -52.49 -0.34 1.27 16 16 C 0.06 1.72 5.30 -17.82 -0.09 1.62 16 17 N -0.88 -24.96 11.32 55.43 0.63 -24.33 16 18 Si 0.90 20.64 29.54 -169.99 -5.02 15.62 16 19 H -0.27 -6.11 7.11 56.52 0.40 -5.71 16 20 H -0.28 -6.56 7.11 56.52 0.40 -6.16 16 21 H -0.28 -6.55 7.11 56.52 0.40 -6.15 16 22 N -0.48 -7.14 2.25 -114.09 -0.26 -7.40 16 23 C 0.12 1.30 5.08 -4.04 -0.02 1.28 16 24 C -0.14 -1.55 1.21 -153.43 -0.19 -1.73 16 25 C -0.12 -1.77 8.16 37.16 0.30 -1.47 16 26 C 0.04 0.43 7.89 37.61 0.30 0.72 16 27 O -0.38 -4.52 12.37 -35.23 -0.44 -4.96 16 28 C 0.05 0.45 8.36 37.61 0.31 0.77 16 29 H 0.05 0.33 8.14 -51.93 -0.42 -0.09 16 30 H 0.06 0.38 8.14 -51.93 -0.42 -0.05 16 31 H 0.06 0.40 8.14 -51.93 -0.42 -0.02 16 32 H 0.08 0.90 8.14 -51.93 -0.42 0.48 16 33 H 0.06 0.47 8.14 -51.93 -0.42 0.04 16 34 H 0.05 0.38 7.20 -51.93 -0.37 0.01 16 35 H 0.05 0.59 7.18 -51.93 -0.37 0.22 16 36 H 0.09 0.95 8.14 -51.93 -0.42 0.53 16 37 H 0.07 0.64 4.98 -51.93 -0.26 0.38 16 38 H 0.03 0.62 8.14 -51.93 -0.42 0.19 16 39 H 0.04 0.61 6.00 -51.93 -0.31 0.29 16 40 H 0.09 1.66 6.40 -51.93 -0.33 1.33 16 41 H 0.03 0.64 6.04 -51.93 -0.31 0.33 16 42 H 0.09 2.44 6.07 -51.93 -0.32 2.12 16 43 H 0.02 0.63 8.14 -51.93 -0.42 0.20 16 44 H 0.26 7.05 8.31 -40.82 -0.34 6.71 16 45 H 0.10 1.11 6.04 -51.92 -0.31 0.79 16 46 H 0.09 0.79 5.42 -51.93 -0.28 0.50 16 47 H 0.08 1.23 8.14 -51.93 -0.42 0.80 16 48 H 0.06 0.81 8.09 -51.93 -0.42 0.39 16 49 H 0.07 1.23 6.44 -51.93 -0.33 0.89 16 50 H 0.08 0.67 6.03 -51.93 -0.31 0.36 16 51 H 0.09 1.04 8.10 -51.93 -0.42 0.62 16 52 H 0.10 0.88 8.10 -51.93 -0.42 0.45 16 53 H 0.08 0.57 8.10 -51.93 -0.42 0.15 16 LS Contribution 398.46 15.07 6.00 6.00 Total: -1.00 -31.21 398.46 -9.10 -40.32 By element: Atomic # 1 Polarization: 10.02 SS G_CDS: -8.89 Total: 1.13 kcal Atomic # 6 Polarization: -3.30 SS G_CDS: -1.09 Total: -4.39 kcal Atomic # 7 Polarization: -54.06 SS G_CDS: 0.33 Total: -53.73 kcal Atomic # 8 Polarization: -4.52 SS G_CDS: -0.44 Total: -4.96 kcal Atomic # 14 Polarization: 20.64 SS G_CDS: -5.02 Total: 15.62 kcal Total LS contribution 6.00 Total: 6.00 kcal Total: -31.21 -9.10 -40.32 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. ZINC001417459667.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 114.501 kcal (2) G-P(sol) polarization free energy of solvation -31.214 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 83.287 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.103 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -40.317 kcal (6) G-S(sol) free energy of system = (1) + (5) 74.184 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.87 seconds