“…Metal-binding patterns (MBP) of acv are supported by crystal structures of mixed-ligand metal complexes. − They can be summarized as follows: MBP-1: M-N7 bond together with ,,,− ,− or without − ,,, an intramolecular interligand O–H···O6(acv) or N–H···O6(acv) interaction. MBP-2: Chelation-N7,O6. ,, MBP-3: μ 2 -N7,O″ bridging mode. , Both the highest denticity , and acv/M ratio ,,,,,,, are two.…”