Compound

ν (N-H)

ν (C=O)

ν (N-N)

ν (C=N)

ν (C=N-N=C)

ν (C-O)

Cu-O

Cu-N

precursor

L1

C1

L2

C2

L3

C3

L4

C4

L5

C5

3282

3377

-

3229

-

3225

-

3222

-

3291

-

1671 (vs)

1699 (vs)

-

1645

-

1653

-

1636 (vs)

-

1642

-

-

976(w)

986(s)

957

986

964

980

960 (w)

976

963 (s)

974

-

1590(s)

1537 (s)

1550

1537

1587

1509

1586 (s)

1553

1587

1564

-

-

1610 (sh)

-

1600 (sh)

-

1615 (sh)

-

1609 (sh)

-

1612

-

-

1371(s)

-

-

1323 (s)

-

1372 (s)

-

1357

-

-

561

-

-

570

-

556

-

511

-

-

482

-

-

485

-

490

-

480