Compound

$v$ (N-H)

$v$ (C=O)

$v$ (N-N)

$v$ (C=N)

$v$ (C=N-N=C)

$v$ (C-O)

Cu-O/

Ag-O

Cu-N/

Ag-N

Precursor

L1

C1

C2

L2

C3

C4

3282

3291

-

-

3225

-

-

1671 (vs)

1642

-

-

1653

-

-

-

963 (s)

974

985

964

980

986

-

1587

1564

1537

1587

1509

1553

-

-

1612 (sh)

1600 (sh)

-

1615 (sh)

1610 (sh)

-

-

1357 (s)

1365 (s)

-

1323 (s)

1360 (s)

-

-

511

510

-

570

515

-

-

480

715

-

485

714