Bond Dissociation Energies Bond
Do298/kJ mol–1
(10.10) Group 10 Ni–H2O Ni(CO)3−N2 Ni(CO)3−CO Ni−CH3 Ni−C2H2 Ni−C2H4 Ni−propyne Ni−2-butyne Pd−OH trans-Pt(PPh3)2(Cl)−H [Ph2PCH2]2MePt−H [Ph2PCH2]2MePt –OH [Ph2PCH2]2MePt –SH Pt(η5-C5H5)(CH3)2–CH3 cis-Pt(PEt3)2(CH3)–CH3
~29 ~42 104.6 ±8.4 208 ±8 193 ±25 147.3 ±17.6 155 ±21 121 ±21 213 307 ±37 104.6 167.4 90.0 163 ±21 269 ±13
(10.11) Group 11 Cu−OH Cu−CO Cu−CH3 Cu−NH3
>406 25 ±5 223 ±5 47 ±15
9-69 Bond
Cu(NH3)−NH3 Cu−C6H6 Cu(C6H6)−C6H6 Ag−CH3 Ag−NH3 Ag(NH3)−NH3 Au−OH Au−NH3 Au−CH3 Au−C6H6
Do298/kJ mol–1 83.7 ±4.2 16.4 ±12.5 27.0 ±19.3 134.1 ±6.8 8 ±13 62.8 ±4.2 >262 76 ±6 ≥191.6 8.4
(10.12) Group 12 Zn−CH3 Zn(CH3)−CH3 Zn−C2H5 Zn(C2H5)−C2H5 Cd−CH3 Cd(CH3)−CH3 Hg−CH3 Hg(CH3)−CH3 ClHg−CH3 BrHg−CH3
70 ±10 266.5 ±6.3 92.0 ±17.6 219.2 ±8.4 63.6 ±10.0 234.3 ±6.3 22.6 ±12.6 239.3 ±6.3 280.0 ±12.6 270 ±38
IHg−CH3
Bond
(10.13) Group 13 H3B−BH3 H3B−NH3 (CH3)3B−NH3 F3B−N(CH3)3 Cl3B−N(CH3)3 F2B−CH3 Al−OH Al−C2H2 Cl3Al−N(CH3)3 (CH3)3Al−N(CH3)3 (CH3)3Al−O(CH3)2 (CH3)3Ga−O(C2H5)2 Cl3Ga-S(C2H5)2 In−CH3 In(CH3)1−CH3 In(CH3)2−CH3 (CH3)3In−N(CH3)3 Tl−OH
Do298/kJ mol–1 258.6 ±12.6 172 130.1 ±4.2 57.7 ±1.3 130 ±4.6 127.6 397 – 418 547 ±13 >54 198.7 ±8.4 130 92 50.6 ±0.8 235.1 216.3 318.8 587.4 83.3 ±2.1 330 ±30
TABLE 4. Enthalpies of Formation of Free Radicals and Other Transient Species
Reference Yu-Ran Luo, Comprehensive Handbook of Chemical Bond Energies, CRC Press, 2007.
Radical (1) Carbon-Centered Species CH CH2 (triplet) CH2 (singlet) • CH3, methyl • C2H, acetenyl, CH≡C• • C2H2, vinylidene CH2=C•• • C2H3, vinyl, CH2=C•H • C2H5, ethyl, CH3C•H2 • C3H3, propargyl, CH≡CC•H2 • C3H3, CH3C≡C•
C3H3, CH2=C=CH• ↔ CH≡CC•H2 • C3H3, cyclopro-2-en-1-yl • C3H5, allyl, CH2=CHC•H2 • C3H5, CH3CH=C•H • C3H5, CH3C•=CH2 • C3H5, cyclopropyl n-C3H7•, n-propyl, CH3CH2C•H2 i-C3H7•, i-propyl, CH3C•HCH3 • n-C4H3, CH≡CCH=C•H • i-C4H3, CH2=C•C≡CH •
∆f Ho298/ kJ mol–1 595.8 ± 0.6 391.2 ± 1.6 428.8 ± 1.6 146.7 ± 0.3 567.4 ± 2.1 419.7 ± 16.7 299.6 ± 3.3 118.8 ± 1.3 339.0 ± 4.2 515 ± 13 339.0 ± 4.2 439.7 ± 17.2 171.0 ± 3.0 267 ± 6 231.4 279.9 ± 10.5 100 ± 2 88 ± 3 547.3 499.2
Radical • C4H5, CH3C≡CC•H2 • C4H5, CH≡CC•HCH3 • C4H5, •CH=CHCHCH2 • C4H5, CH2=CHC•CH2 • C4H7, CH3CH=CHC•H2 • C4H7, CH2=CHCH2C•H2 • C4H7, CH2=C(CH3)C•H2 • C4H7, CH2=CHC•HCH3 • C4H7, cyclopropylmethyl • C4H7, cyclobutyl n-C4H9•, n-butyl, CH3CH2CH2C•H2 i-C4H9•, i-butyl, (CH3)2CHC•H2 s-C4H9•, s-butyl, CH3C•HCH2CH3 t-C4H9•, t-butyl, (CH3)3C• • C5H3, CH≡C-C≡CC•H2 • C5H3, (CH≡C)2C•H • C5H5, CH2=CHC≡CC•H2 • C5H5, CH2=CH-C•H-C≡CH • C5H5, cyclopenta-1,3-dien-5-yl • C5H7, CH3C≡CC•HCH3 • C5H7, CH≡CC•HC2H5
∆f Ho298/ kJ mol–1 304.5 316.5 364.4 313.3 146 ± 8 192.5 137.9 136.2 213.8 ± 6.7 219.2 ± 4.2 77.8 ± 2.1 70 ± 4 67.8 ± 2.1 48 ± 3 579.1 573.2 351.5 372.4 274.1 ± 7.3 272.8 ± 9.2 277.0 ± 8.4
Radical • C5H7, CH≡CC•(CH3)2 • C5H7, CH2=CHCH=CHC•H2 • C5H7, (CH2=CH)2C•H • C5H7, CH3CH=C=CHC•H2 • C5H7, spiropentyl • C5H7, cyclopent-1-en-3-yl • C5H9, cyclopentyl • C5H9, CH2=CHC•HCH2CH3 • C5H9, CH3CH=CHC•H(CH3) • C5H9, CH3CH=C(CH3)C•H2 • C5H9, CH2=CHC•(CH3)2 • C5H9, CH2=C(CH3)C•H(CH3) • C5H9, CH2=C(C•H2)CH2CH3 • C5H9, CH2=CH(CH2)2C•H2 nC5H11•, CH3CH2CH2CH2C•H2 • C5H11, (C2H5)2C•H • C5H11, (nC3H7)(CH3)C•H • C5H11, (CH3)3C•CH2 • C5H11, (C2H5)(CH3)2C• • C6H5, phenyl • C6H7, cyclohexa-1,3-dien-5-yl • C6H7, cyclohexa-1,4-dien-3-yl • C6H9, CH3C≡CC•(CH3)2
∆f Ho298/ kJ mol–1 257.3 ± 9.2 205.0 ± 12.6 208.0 ± 4.2 278.0 380.7 ± 4.2 160.7 ± 4.2 105.9 ± 4.2 109.6 ± 8.4 92 92.0 87.0 ± 8.4 93.7 114.2 179.5 54.4 47.0 50.2 36.4 ± 8.4 29 330.1 ± 3.3 199.2 201.7 ± 5.0 221.8 ± 9.2