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. Author manuscript; available in PMC: 2010 Aug 19.
Published in final edited form as: J Am Chem Soc. 2009 Aug 19;131(32):11535–11547. doi: 10.1021/ja902224m

Table 2.

Transient cascade characteristics observed upon irradiation of azide 5 in various solvents. Frames A-E refer to the corresponding time frames in Fig. 4, their associated λmax's and time constants for the solvents indicated.

Solvent Pump
λ
(nm)		 Frame
A
λmax (nm)		 τ1
(fs)		 Frame
B
λmax
(nm)		 τ2
(ps)		 Frame
C
λmax
(nm)		 τ3
(ps)		 Frame
D
λmax
(nm)		 τ4
(ps)		 Frame
E
λmax (nm)c 		τ5
(ns)
1 CH3OH 350 568 275 547 0.904 503 4.8 488 446 501
2 CH3OD 350 556 316 543 1.07 502 6.7 484 430 497
3 CD3OD 350 562 329 547 1.21 510 7.2 486 481 490
4 CH3CH2OH 350 567 310 539 1.4 513 9.5 470 394 488 325
5 n-C4H9OH 350 555 286 544 1.28 522 12.4 460 275 485 389
6 n-C8H17OH 350 566 329 539 2.05 501 23.4 462 435 484
7 (CH3)2CHOHa 350 562 333 541 1.76 528 19 465 507 486 557
8 (CH3)2CHOHb 305 580-620 564 540 5.46 531 20.5 460 833 484
9 (CH3)2CHOD 350 562 304 541 1.83 528 16.4 465 289 486 -
10 (CH3)2CHOH 420 559 378 538 2.81 - - - - - -
11 (CH3)3COH 350 554 266 539 1.28 535 12.8 470 833 485 1260
12 HOCH2CO2Et 350 562 525 535 3.28 476 12.8 474 1923 490 -
13 CH3CN (dry)c,d 350 559 247 523 0.71 482 9.6 484 238 489 -
14 CH3CN +
2 M PhOH		 350 547 231 548 0.94 533 11.8 479 204 487 -
15 C6H12 350 550±10 422±88 522±5 3.6±
0.3		 488±3 80±29 452±4 666 - -
16 C6H12 420 570 430 517 6.26 - - - - - -
17 C6H12 +
2M PhOH		 350 562 276 540 1.8 476 17.8 456 183 466 -
18 C6H5CH3 350 569 686 514 23.8 543 314.5 492 c - -
a

Plotted in Fig. 4.

b

S1 absorption is difficult to measure at this exciting wavelength.

c

Persists to the limit of the time window (1.2 ns) of ultrafast transient absorption experiments.

d

Well fitted by three exponentials, but these listed data are for four exponentials in order to compare with other data that requires four exponentials for a satisfactory fit.