Disclosed herein are conjugates that include a ligand, and a compound having the structure of formula (I)M is Pt, Pd or Ni Q is As, Sb or Bi Z1 is N Z2 is O or S L1 and L2 are independently C(O), C—R1 or C—R2 X is a Lewis base Y1 and Y2 are independently selected from —OR3, —OR4, —SR3 and —SR4, wherein R1 and R2 are independently selected from hydrogen, halogen, cyano, keto, ester, ether, thiol, thioether, thioester, imino, C1-C10 alkyl, C1-C10 alkenyl, alkynyl, alkoxyl, amino, amidyl, immino, sulfonyl, sulfoxyl, phosphoryl, phosphoryl ester, glycosyl, aryl, C3-C15 cycloalkyl, heteroaryl, and C3-C15 heterocycloalkyl and R3 and R4 are independently selected from hydrogen, C1-C10 alkyl, C1-C10 alkenyl, alkynyl, alkoxyl, amino, amidyl, immino, sulfonyl, sulfoxyl, phosphoryl, phosphoryl ester, glycosyl, aryl, C3-C15 cycloalkyl, heteroaryl, and C3-C15 heterocycloalkyl.
