Naphthyridine 1,5-Dioxide Complexes

The title compound forms coordination compounds with Cu(II) chloride, bromide, and nitrate. The postulated structure of these compounds is 161.113 

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Naphthyridine will form complexes of the type ML2 with Cu(II), Co(II) and Ni(II) but not with Cd(II), Pd(II), Ba(II) or Zn(II) (66MI21101). 1,5-Naphthyridine 1,5-dioxide forms coordination compounds with Cu(II) salts (76IC2916), and metal complexes of l,7-naphthyridin-8-ones with Cu(II), Ni(II), Fe(II) and Fe(III) have also been prepared (54JCS505). A more detailed account of metal ion-naphthyridine complex formation is given in a recent review (83AHC(33)147). 

Naphthyridine 1,5-dioxide underwent complexation with Cu(II) salts the highly colored products were studied in detail.349... 

Trimethylene-2,2 -bi-l,8-naphthyridine with [Re(CO)5Br] in heptane gives the bidentately coordinated complex 27 (960M3463). Compounds of the same composition, [Re(CO)3(LL)Cl] (LL = 3,3,-dimethylene-2,2,-biquinoline) can be prepared similarly (94IC2341). / -(2,6-di-2-pyridyl-4-pyridyl)phenol reacts with [Re(CO)5Cl] and forms complex 28 with bidentate coordination of the ligand (92JPP(A)259). The product is active in the electro- and photochemical reduction of carbon dioxide. Species [Re(CO)3(2,7-bis(2,-pyridyl)-l,8-naphthyridine)Br] is known (83ICA(76)L29). 

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