inorganic chemistry

nonradiative decay rate was calculated by subtracting the contri-
bution of the photochemical reaction from the inverse of the
emission lifetime (te). The slope (
8.4 eV
^1 ) for the rhenium(I)
complexes was similar to that of the Ru(II) complexes
(
7.54 eV
^1 ).

TABLE I

PHOTOPHYSICALPROPERTIES OFSOMERe(I) BIPYRIDINECOMPLEXES IN ANCH 3 CN

SOLUTION ATROOMTEMPERATURE( 26 ).

[Re(X 2 bpy)(CO) 3 (L)]þ la(^1 MLCT)

(nm)

le(nm) te(ns) Fe Fr

Abbr. X L

1a H Cl
370 a 622 b 25 b 0.005c –
2a H py 351 d 545 d 250 d 0.059e –
3a H P(OEt) 3 336 542 1034 0.155 0.0089
3b CH 3 P(OEt) 3 330 533 936 0.175 0.16
3c CF 3 P(OEt) 3 363 622 162 0.031 0.0003

aRef. ( 27 ).

bRef. ( 28 ).

cIn CH 2 Cl 2 , Ref.( 5 ).

dRef. ( 29 ).

eRef. ( 30 ).

14000

14

16

In (

kd

/s

–1

)

E 00 (^3 MLCT) (cm–1)

18

20

16000 18000 20000

FIG. 4. Plots of lnkd of various rhenium(I) diimine tricarbonyl
complexes versusE 00 (^3 MLCT) at 25C in a degassed CH 3 CN solution.

RHENIUM(I) DIIMINE COMPLEXES 143