International Scholarly Research Notices

Research Article

New Di- and Triorganotin(IV) Tyrosylalaninates as Models for Metal—Protein Interactions: Synthesis, Structural Characterization, and Potentiometric Studies of Tyrosylalanine, Glycyltyrosine, and Glycylisoleucine with Di- and Trimethyltin(IV) Moieties in Aqueous Medium

Table 2

IR frequenciesa (in cm−1) of di- and triorganotin(IV) tyrosylalaninates.
Compoundν(O–H)ν(N–H)/ν(C–H) 𝜈 ( C O ) a m i d e 𝜈 a s (COO)/ 𝜈 s (COO)Δν 𝜈 a s (Sn–C)/ 𝜈 s (Sn–C)ν(Sn–O)/ν(Sn←N)
H2Tyr-Ala3440 m
3180 br		16701560 m
1390 m		170——
Me2Sn(Tyr-Ala)3516 m3380 m
3286 m
3230 w
3177 m
2924 w		1594 vs1514 m/1340 w 1291 w174592 m/523 m551 m/489 w
n-Bu2Sn(Tyr-Ala)3566 m3427 s
3343 s
3239 w
3187 s		1655 s1622 vs/1369 w253671 m/587 m557 m/451 m
n-Oct2Sn(Tyr-Ala)3586 m3412 m
3270 m
3227 m
3014 w		1640 brsh1610 vs/1379 m231677 m/555 s570 w/452 vw
Ph2Sn(Tyr-Ala)3571 s3424 s
3333 s
3231 w
3194 s		1633 vs1615 s/1397 m218247 m/226 m533 m/457 m
Me3Sn(HTyr-Ala)3439 br3332 s
3265 s
3101 s		1659 m1602 vs/1394 m208607 w/591 w545 m/424 m
Ph3Sn(HTyr-Ala)3457 s3344 s
3171 s
3055 s		1660 vs1526 s/1250 s276280 m/228 w503 m/449 m
avs, very strong; s, strong; m, medium; w, weak; br, broad.