초록

The invention concerns gadolinium complexes of formula: [ STR 1 ] in which R represents a group of formula: [ STR 2 ] in which X is Br or I; R.sub.1 is H or optionally hydroxylated alkyl;

대표청구항 ▼

[ We claim:] [1.] Gadolinium complex of formula: [ STR 14 ] in which R represents a group of formula: [ STR 15 ] in which X is Br or I, R.sub.1 is selected from the group consisting of H, (C.sub.1 -C.sub.3)alkyl or (C.sub.2 -C.sub.8)mono- or polyhydroxyalkyl andR.sub.2 is selected from the group con

[ We claim:] [1.] Gadolinium complex of formula: [ STR 14 ] in which R represents a group of formula: [ STR 15 ] in which X is Br or I, R.sub.1 is selected from the group consisting of H, (C.sub.1 -C.sub.3)alkyl or (C.sub.2 -C.sub.8)mono- or polyhydroxyalkyl andR.sub.2 is selected from the group consisting of (C.sub.2 -C.sub.8)mono- or polyhydroxyalkyl, or alternativelyR.sub.1 is H and R.sub.2 is a group of formula: [ STR 16 ] X being as defined above, and R'.sub.1 and R'.sub.2 taken, independently of each other, any one of the meanings given for R.sub.1 and R.sub.2, with the exception of A, provided that --CO--NR.sub.1 R.sub.2 or --CO--NR'.sub.1 R'.sub.2 comprises at least 2 hydroxyl groups, and M represents H or the cation of an inorganic or organic base.