Table 2.
Electronic Spectral Data for Selected Iron(II) and Iron(III) Tetraarylporphyrins a
| λmax (nm) | |||||||
|---|---|---|---|---|---|---|---|
| Complex | Soret region (log ε) | α, β region (log ε) | ref. | ||||
| Five-Coordinate Iron(II) | |||||||
| [Fe(TPP)(NO)]b | 406 (4.97) | 475(sh) | 538 (4.00) | 604 (3.45) | 36 | ||
| [Fe(TpivPP)(NO)]c | 407 (5.15) | 477(sh) (4.35) | 539 (4.12) | 607 (3.62) | 25 | ||
| [Fe(TMP)(NO)]d | 408 (4.96) | 477(sh) | 539 (3.04) | 611 (3.84) | 37 | ||
| [Fe(TPP)(CO)]e | 419 | 537 | 570 | ~610 | 38 | ||
| [Fe(TpivPP)(NO2)]− c | 433(sh) (4.94) | 444 (5.12) | 543(sh) (3.89) | 567 (4.02) | 608 (3.59) | 20,22 | |
| Six-Coordinate Iron(II) Nitro | |||||||
| [Fe(TpivPP)(NO2)(CO)]−c | 414 (sh) (4.67) | 434 (5.30) | 546 (3.98) | tw | |||
| [Fe(TpivPP)(NO2)(t-BuNC)]−c | 441 (5.52) | 541 (4.20) | 572 (3.45) | tw | |||
| [Fe(TpivPP)(NO2)(NO)]− c | 433 (5.17) | 543 (4.14) | 21 | ||||
| [Fe(TpivPP)(NO2)(Py)]− c | 413(sh) (4.83) | 430 (5.23) | 533 (4.21) | 560(sh) (3.66) | 653 (2.83) | 22 | |
| [Fe(TpivPP)(NO2)(PMS)]− c | 418(sh) (4.88) | 432 (5.07) | 537 (4.18) | 558(sh) (3.81) | 653 (3.12) | 22 | |
| Six-Coordinate Iron(II) Other | |||||||
| [Fe(TPP)(1-MeIm)(NO)]b | 415 (5.26) | 460 (4.26) | 545 (3.99) | 580(sh) (3.78) | 643 (3.05) | 39 | |
| [Fe(TPP)(4-NMe2Py)(NO)]d | 416 | 554 | 586 | 40 | |||
| [Fe(TPP)(1-MeIm)(NO)]d | 416 | 543 | 583 | 641 | 40 | ||
| [Fe(TPP)(4-MePip)(NO)]d | 417 | 463 | 554 | 591 | 40 | ||
| [Fe(TPP)(1-VinIm)2]d | 424 (5.22) | 533 (4.24) | 564 (3.67) | 41 | |||
| [Fe(TPP)(1-BzlIm)2]d | 426 (5.23) | 533 (4.24) | 565 (3.63) | 41 | |||
| [Fe(TPP)(1-AcIm)2]d | 422 (5.14) | 533 (3.99) | 563 (3.62) | 41 | |||
| [Fe(TPP)(1-MeIm)2]d | 425 (5.09) | 533 (4.26) | 564 (3.75) | 41 | |||
| [Fe(TpivPP)(1-MeIm)2]c | 430 | 536 | 42 | ||||
| [Fe(TpivPP)(1-MeIm)2]e | 432 (5.36) | 537 (4.32) | 562(sh) | 43 | |||
| [Fe(TpivPP)(Im−)(HIm)]−c | 442 (4.00) | 544 (3.47) | 44 | ||||
| [Fe(TPP)(1-MeIm)(CO)]e | 427 (5.50) | 542 (3.95) | 43 | ||||
| [Fe(TPP)(1-MeIm)(CO)]d | 422 | 544 | 45 | ||||
| [Fe(TpivPP)(1-MeIm)(CO)]c | 425 | 542 | 42 | ||||
| [Fe(TPP)(CO)2]e | 426 | 551 | 578 | 38 | |||
| Iron(II) Thiolates | |||||||
| [Fe(TpivPP)(SEt)]−c | 421 | 533 | 575 | 625 | 46 | ||
| [Fe(TpivPP)(SEt)(CO)]−c | 392,467 | 565 | 612 | 46 | |||
| [Fe(TpivPP)(SPh)]−c | 421 | 536 | 575 | 625 | 46 | ||
| [Fe(TpivPP)(SPh)(CO)]−c | 403,464 | 555 | 605 | 46 | |||
| Six-Coordinate Iron(III) Nitro | |||||||
| [Fe(TpivPP)(NO2)2]− c | 364(sh) | 426 (5.11) | 464(sh) | 553 (4.15) | 23 | ||
| [Fe(TpivPP)(NO2)(Py)]c | 422 (5.26) | 459 (sh) | 550 (4.11) | 24 | |||
| [Fe(TPP)(NO2)(NO)]b | 433 (5.34) | 510(sh) (3.70) | 545 (4.20) | 577(sh) (3.70) | 47 | ||
| [Fe(Tp-OCH3PP)(NO2)(NO)]c | 437 | 549 | 586 | 26 | |||
| [Fe(TpivPP)(NO2)(NO)]e | 433 | 543 | 581 | 26 | |||
a
All spectra were taken at 25°C.
b
Chloroform solution.
c
Chlorobenzene solution.
d
Dichloromethane solution.
e
Toluene solution.