Synthesis, Characterization, and Antibacterial Activity of Biocompatible Aluminium Complexes with N-(2-Hydroxy-5-methyl benzyl)phenylalanine

Table 2

Characteristics infrared frequency (cm⁻¹) of aluminium derivatives (1a–1c).

1/1a–1c	νO-H^a	νN-H,νC-H^b	νC-H^c	νasCOO	∆νCOO	νsCOO	νC-N^d	νAl-O	νAl-N
1	3440–3200 (mb)	3240–3000 (mb)	2930 (m) 2850 (w)	1625 (s)	285	1340 (m)	1230 (mb)	—	—
1a	—	3280–3000 (b)	2960 (mb) 2860 (m)	1630 (mb)	240	1390 (s)	1265 (b)	610 (s) 570 (m)	480 (m) 460 (m)
1b	3600–3300 (b)	3200–3000 (mb)	2935 (w) 2910 (mb) 2850 (w)	1643 (s)	257	1386 (mb)	1263 (m)	595 (m) 550 (s)	485 (m) 475 (m)
1c	3550–3300 (vb)	3150–3000 (mb)	2990 (m) 2840 (w)	1642 (vs)	262	1380 (s)	1250 (s)	600 (s) 560 (m)	490 (m) 470 (w)

^aAbsorption frequency (cm⁻¹) of the phenolic (O-H) group; ^bAbsorption frequency (cm⁻¹) of N-H and C-H of both aromatic rings; ^cAbsorption frequency (cm⁻¹) of C-H of -CH3 and both -CH2- groups; ^dAbsorption frequency (cm⁻¹) of C-N bond. Vb = very broad, b = broad, m = medium, mb = medium broad, w = weak, wb = weak broad, s = sharp, vs = very sharp, sb = sharp broad, and sh = shoulder hump.