Table 1.

Calculated and experimental^* thermodynamic hydricities (kcal/mol) in CH₃CN solution

Hydride donor	Conjugate hydride acceptor	Expt.
CHO-	CO		−10.0	−10.8
	CH3COCH3		18.5	19.8
[Re(pbnHH•-)(CO)3(Cl)]-	[Re(pbnH•)(CO)3(Cl)]0		32.4	34.9
[RuII(bpy)(tpy)(H)]+	[RuII(bpy)(tpy)(NCMe)]2+	39†	36.0	38.7
HCOO-	CO2	43	39.1	42.1
	[RuII(bpy)2(pbnH•)]2+		46.6	50.1
	[RuII(bpy)2(iso-pbnH•)]2+		47.1	50.7
[Cp∗ ReI(NO)(CO)(CHO)]0	[Cp∗ ReI(NO)(CO)2]+	52.6	49.7	53.4
MNAH	MNA+		52.0	55.8
[CpReI(NO)(CO)(CHO)]0	[CpReI(NO)(CO)2]+	55	52.8	56.8
BNAH	BNA+	59	53.3	57.2
p - monohydroquinone-	p-benzoquinone		58.9	63.3
H2	H+	76	61.2	65.8
[Re(pbnHH)(CO)3(Cl)]0	[Re(pbnH+)(CO)3(Cl)]+		76.5	82.2
CH3C(OH)HCH3			81.6	87.7
[RuII(bpy)2(pbnHH)]2+	[RuII(bpy)2(pbnH+)]3+		82.6	88.7
[RuII(bpy)2(iso-pbnHH)]2+	[RuII(bpy)2(iso-pbnH+)]3+		85.2	91.5
Ph3CH	Ph3C+	99	92.0	98.9

^*Experimental data taken from refs. 12 and 14 unless otherwise indicated.

^†Value from our preliminary work.