Disclosed herein are nanostructures comprising a polymeric framework comprising at least five geminal bisphosphonate groups, wherein the geminal bisphosphonate groups independently of each other are incorporated as —R
3
R
4
C(P═O(OR
1
)(OR
2
))
2
, wherein R
1
and R
2
are independently selected from the group consisting of a negative charge, H, alkyl and aryl, and wherein at least one of R
3
and R
4
is a group connected to the polymeric framework with the proviso that when only one of R
3
and R
4
is such a connected group, the other of R
3
and R
4
is either a group being able to connect to the polymeric framework, or the residue of such a group, or selected from the group consisting of H, OH, OR
5
and R
5
, wherein R
5
is a lower alkyl. The polymeric framework may comprise manganese ions. Disclosed are also methods for producing such manganese containing nanostructures, compositions comprising such manganese containing nanostructures and use of such manganese containing nanostructures, i.a. as MRI contrasting agents.
本文披露了一种纳米结构,包括至少五个双
磷酸酯基团的聚合物框架,其中双
磷酸酯基团独立地作为-R3R4C(P═O(OR1)(OR2))2并入,其中R1和R2分别选择自阴离子、H、烷基和芳基的群组,而且R3和R4中至少有一个是连接到聚合物框架的群组,但是当R3和R4中仅有一个是这样的连接群组时,另一个则为能够连接到聚合物框架的群组,或是这样的群组的残基,或选择自H、OH、OR5和R5的群组,其中R5是较低的烷基。聚合物框架可以包括
锰离子。此外,本文还披露了制备这种含
锰纳米结构的方法,包含这种含
锰纳米结构的组合物以及使用这种含
锰纳米结构的方法,例如作为MRI对比剂。