“…Kroener et al [9] have studied the X-ray crystal structures of some cis-and trans-bis (2,2′-bipyridine) -bis (phenothiazine-S) ruthenium(II) hexaflurophosphates. Made Gowda et al have previously studied the synthesis and characterization of some coordination compounds of NAPTZs with rhodium (II/III), rhenium (VII), iridium (III /IV), molybdenum (IV/V), zinc(II), palladium (II) and mercury (II) [10][11][12][13][14][15][16]. Chaitanya Lakshmi et al have reported the synthesis and free-radical scavenging activities of transition metal (II)-pyridoxine complexes [17][18][19].…”