TUNGSTEN CLUSTERS

摘要

The present invention provides new tri-tungsten compounds of general structure (I) wherein R<1> is -CkH1Zm or -(CkH1Zn) (C6H(5-q) Zq)p; R<2> is -CkH1Zm or -(CkH1Zn) (C6H(5-q) Zq)p; R<3> is -CkH1Zm or -(CkH1Zn) (C6H(5-q) Zq)p; R<4> is -CkH1Zm or -(CkH1Zn) (C6H(5-q) Zq)p; R<5> is -CkH1Zm or -(CkH1Zn) (C6H(5-q) Zq)p; R<6> is -CkH1Zm or -(CkH1Zn) (C6H(5-q) Zq)p; Z is a functional group attachable on aliphatic chains or aromatic rings; R<7> is an anionic molecule, neutral molecule, -CkH1Zm ou -(CkH1Zn) (C6H(5-q) Zq)p; R<8> is an anionic molecule, neutral molecule, -CkH1Zm or -(CkH1Zn) (C6H(5-q) Zq)p; R<9> is an anionic molecule, neutral molecule, -CkH1Zm or -(CkH1Zn) (C6H(5-q) Zq)p; k is about 0-20; 1 is about 0-50; m is about 1-50; n is about 0-50; p is about 1-10; q is about 1-5; M is a counter positive or negative ion; and a is about -6 - +6. W in the structure is the generally accepted one letter symbol for tungsten. Methods of imaging using compounds of the invention and processes for producing compounds of the invention are also disclosed.