Oxovanadium(IV) Complexes with Nitrogen Donors: Synthesis, Characterisation, and Biological Activities

Table 2

Main infrared absorption frequencies (cm⁻¹) corresponding to various groups in the VO(SA/SSA) complexes with nitrogen donors.

Codes	Name of the complex	𝜐C--O	𝜐C=O	𝜐C=N	𝜐C=C	𝜐V--N	𝜐V--O	𝜐S=O; sym., asym	𝜐V=O
MB-1.	Bis(o-methylpyridine)salicylatooxovanadium^(IV); [VO(C7H4O3)(C6H7N)2]	1392.3	1662.4	1606.5	1583.3	467.3	540.2	—	950.3
MB-2.	Bis(m-methylpyridine)sulphosalicylatooxovanadium^(IV); [VO(C7H4O6S)(C6H7N)2]	1395.6	1663.8	1625.0	1562.7	450.1	551.2	1131.2; 1325.4	954.8
MB-3.	Bis(o-aminopyridine)sulphosalicylatooxovanadium^(IV); [VO(C7H4O6S)(C5H6N2)2]	1390.5	1680.2	1605.0	1558.8	470.2	679.2	1128.6; 1317.9	915.5
MB-4.	(1,10-Phenanthroline)sulphosalicylatooxovanadium^(IV); [VO(C7H4O6S)(C12H8N2)]	1396.3	1686.0	1602.7	1560.0	453.3	532.3	1126.3; 1333.1	945.9
MB-5.	(Ethylenediamine)sulphosalicylatooxovanadium^(IV); [VO(C7H4O6S)(C2H8N2)]	1380.2	1680.1	1601.9	1570.6	470.0	676.0	1124.0; 1316.1	947.6