34, Selen (Se)

Selenium, gr. selene = Mond

Thermodynamik:
         
  P S Cl  
  As Se Br  
  Sb Te I  
         
  kJ/mol
Schmelzenthalpie: 5.4
Verdampfungsenthalpie: 26
Sublimationsenthalpie: 31.41
   
Atomisierungsenthalpie: 227.07
Kovalente Bindungs-Enthalpien ΔH:

Bindung: Energie
(kJ/mol)		 Länge
(pm)		   Bindung: Energie
(kJ/mol)		 Länge
(pm)
H−Se[2] 312.5   151   B−Se[2] 461.9 ±3.2% 204
C−Se[1] 247   196   C−Se[2] 590.4 ±1% 196
C=Se[1] 456   ?   Al−Se[2] 318 ±4.1% 241
Si−Se[2] 538 ±2.4% 231   P−Se[2] 363.7 ±2.7% 227
Sc−Se[2] 385 ±4.4% 290   Ti−Se[2] 381 ±11% 280
V−Se[2] 347 ±6.1% 273   Mn−Se[1] 9.2   ?
Cu−Se[2] 255.2 ±5.7% 252   Zn−Se[2] 170.7 ±15.2% 242
Ge−Se[2] 484.7 ±0.4% 240   As−Se[1] 193   239
As−Se[2] 96   239   Se−H[1] 314   151
Se−C[2] 371.1 ±1.8% 196   Se−O[2] 429.7 ±1.5% 186
Se=O[1] 425   ?   Se−F[1] 285   177
Se−F[2] 339 ±12.4% 177   Se−S[1] 192   225
Se−Cl[2] 390.8 ±2.5% 222   Se−Cl[2] 322   222
Se=Se[1] 272   215   Se−Se[2] 330.5   240
Se−Br[2] 297 ±28.3% 240   Sr−Se[2] 251 ±5% 315
Y−Se[2] 435 ±3% 310   Ag−Se[2] 210 ±7% 265
Cd−Se[2] 127.6 ±19.7% 264   In−Se[2] 245.2 ±6% 262
Sn−Se[2] 401.2 ±1.5% 259   Te−Se[2] 293.3   258
La−Se[2] 485.7 ±3% 327   Ce−Se[2] 494.5 ±3% 324
Pr−Se[2] 446.4 ±5.2% 323   Nd−Se[2] 393.9   321
Sm−Se[2] 331 ±4.4% 318   Eu−Se[2] 302.9 ±4.8% 318
Gd−Se[2] 430 ±3.5% 316   Tb−Se[2] 423 ±4.7% 314
Dy−Se[2] 322 ±6.2% 312   Ho−Se[2] 333 ±4.5% 312
Er−Se[2] 326 ±6.1% 309   Tm−Se[2] 274 ±14.6% 310
Lu−Se[2] 418 ±3.6% 307   Au−Se[2] 251 ±5.8% 256
Hg−Se[2] 144.3 ±20.9% 252   Pb−Se[2] 302.9 ±1.4% 266
Bi−Se[2] 280.3 ±2.1% 268    

[1] Kovalente Bindung innerhalb eines Moleküles, Durchschnittswert.
[2] Bindung innerhalb eines diatomaren Moleküles in der Gasphase.

Thermodynamische Daten der Selen-Modifikationen:

Phasenbezogene thermodynamische Daten:
  ΔFHo
in kJ/mol		 ΔFGo
in kJ/mol		 So
in J/mol•K		 cp
in J/mol•K
Fest: -- -- 42.4 25.4
Flüssig: -- -- -- 34.94
Gas: 227.1 187 176.7 20.8

Thermodynamische Daten der Phasenübergänge:
  Enthalpie ΔH Entropie ΔS  
Schmelzen: 5.403 kJ/mol 10.93 J/(mol•K)  
Verdampfen: 95.4 kJ/mol 99.57 J/(mol•K)