Quinolone- and naphthyridonecarboxylic acid derivatives

Compounds of the formula (I)

• T--Q (I)
• in which
• Q denotes a radical of the formula ##STR62## wherein R.sup.1 represents alkyl which has 1 to 4 carbon atoms and is optionally mono- or disubstituted by halogen or hydroxyl, alkenyl having 2 to 4 carbon atoms, cycloalkyl which has 3 to 6 carbon atoms and is optionally substituted by 1 or 2 fluorine atoms, bicyclo›1.1.1!-pent-1-yl, 1,1-dimethylpropargyl, 3-oxetanyl, methoxy, amino, methylamino, dimethylamino or phenyl which is optionally mono- or disubstituted by halogen, amino or hydroxyl,
• R.sup.2 represents hydroxyl, alkoxy which has 1 to 3 carbon atoms and is optionally substituted by hydroxyl, methoxy, amino or dimethylamino, benzyloxy or (5-methyl-2-oxo-1,3-dioxo-4-yl)methyloxy, acetoxymethyloxy, pivaloyloxymethyloxy, 5-indanyloxy), phthalidinyloxy, 3-acetoxy-2-oxo-butyloxy, nitromethyl or dialkoxycarbonylmethyl having 1 to 2 carbon atoms in each alkyl part,
• X.sup.1 represents hydrogen, halogen or nitro,
• X.sup.2 represents hydrogen, halogen, amino, hydroxyl, methoxy, mercapto, methyl, halogenomethyl or vinyl,
• A represents N or C--R.sup.7, wherein
• R.sup.7 represents hydrogen, halogen, CF.sub.3, OCH.sub.3, OCHF.sub.2, CH.sub.3, CN, CH.dbd.CH.sub.2 or C.tbd.CH, or together with R.sup.1 can also form a bridge having the structure --.sup.* O--CH.sub.2 --CH--CH.sub.3, --.sup.* S--CH.sub.2 --CH.sub.2 --, --.sup.* S--CH.sub.2 --CH--CH.sub.3, --.sup.* CH.sub.2 --CH.sub.2 --CH--CH.sub.3 or --.sup.* O--CH.sub.2 --N--R.sup.8, wherein the atom labelled with .sup.* is linked to the carbon atom of A and wherein
• R.sup.8 denotes hydrogen, methyl or formyl, and
• T denotes a radical of the formula ##STR63## wherein B represents (CH.sub.2).sub.m --NR.sup.3 R.sup.4 or (CH.sub.2).sub.m --OR.sup.5, wherein
• m represents 0 or 1,
• R.sup.3 represents hydrogen, alkyl which has 1 to 3 carbon atoms and is optionally substituted by hydroxyl, acyl having 1 to 3 carbon atoms or alkoxycarbonyl having 1 to 4 carbon atoms in the alkyl part,
• R.sup.4 represents hydrogen or methyl and
• R.sup.5 represents hydrogen or methyl and
• R.sup.6 represents hydrogen or methyl,
• and pharmaceutically usable hydrates and acid addition salts thereof, as well as the alkali metal, alkaline earth metal, silver and guanidinium salts of the underlying carboxylic acids.