Compounds

Abs. max. cm−1

Tentative assignment

Ligand (L)

39,525

26,881

π®π*

n®π*

[CuL1]Cl2

45,248

39,840

27,322

π®π*

π®π*

n®π*

[CuL1](NO3)2

40,000

26,178

21,739

π®π*

n®π*

d-d transition