Synthesis, Spectroscopic, Molecular Structure, and Antibacterial Studies of Dibutyltin(IV) Schiff Base Complexes Derived from Phenylalanine, Isoleucine, and Glycine

Table 2

Important IR spectral data (cm⁻¹) of Schiff bases and their corresponding organotin(IV) complexes.

Compounds	ν(OH)	(C=N–)	(C=O)	(COO)	(COO)		(Sn←N)	(Sn–O)	(Sn–C)
L^1H	3090–2740 br	1620 s	1728 s	—	—	—	—	—	—
Bu2Sn(L^1)2	—	1610 s	1722 s	1590 vs	1325 s	265	540 w	430 m	622 m
L^2H	3100–2740 br	1625 s	1730 s	—	—	—	—	—	—
Bu2Sn(L^2)2	—	1612 s	1726 s	1605 m	1333 m	272	545 m	426 s	640 m
L^3H	3090–2750 br	1630 s	1720 s	—	—	—	—	—	—
Bu2Sn(L^3)2	—	1616 s	1722 s	1601 s	1332 m	268	552 m	425 m	630 m
L^4H	3110–2750 br	1622 s	1735 s	—	—	—	—	—	—
Bu2Sn(L^4)2	—	1605 s	1732 s	1608 s	1330 m	278	545 s	420 w	635 m
L^5H	3080–2730 br	1630 s	1735 s	—	—	—	—	—	—
Bu2Sn(L^5)2	—	1612 s	1734 s	1595 vs	1326 s	269	540 w	425 w	625 m
L^6H	3109–2730 br	1622 s	1725 s	—	—	—	—	—	—
Bu2Sn(L^6)2	—	1610 s	1728 s	1610 vs	1340 vs	270	544 w	432 m	632 m

br: broad, vs: very sharp, v: sharp, m: medium, and w: weak.