Band (cm⁻¹) assignments

Compound

ν_s(CO)

ν_s(C=C)

ν_s(CCN)

(NH₃)

bpa_(free)^a

-

1600

1200

py_(free)^b

-

1586

1218

4-pic_(free)^b

-

1632

1230

4-acpy_(free)^b

1726

1262

isn_(free)^b

1655

1622

1219

trans-[Ru(NH₃)(bpa)(py)]⁺²

-

1630

1274

3446

trans-[Ru(NH₃)(bpa)(4-pic)]⁺²

-

1632

1276

3424

trans-[Ru(NH₃)(bpa)(4-acpy)]⁺²

1686

1606

1276

3434

trans-[Ru(NH₃)(bpa)(isn)]⁺²

1672

1618

1348

3432