三元钙配合物的分子内芳环堆积效应研究(英文)

Study on the Intramolecular Aromatic-Ring Stacking Interaction in the Ternary Calcium Complexes (Ⅶ)

pH电位滴定法测定了Ca(Ⅱ )与核苷酸NTP(NTP为腺苷 5′ 三磷酸和尿苷 5′ 三磷酸 )和另一芳环系列配体HRB形成的三元混配配合物Ca(HRB) (NTP) n -(HRB =phen ,bpy和trp ;n =2或 3)在水溶液中的稳定常数 (I =0 1mol/L ,KNO3 ;2 5℃ ) .比较了二元和三元混配配合物的稳定性差异 ,认为三元混配配合物稳定性的增加可归因于π 酸 π

The stability constants of the ternary mixed ligand complexes of Ca(NTP)(HRB) n- ( n =2 or 3) have been determined by potentiometric pH titration in aqueous solution ( I =0 1?mol/L,KNO 3; 25℃), where NTP refers to adenosine 5′ triphosphate (ATP) and uridine 5′ triphosphate(UTP); HRB refers to 110 phenanthroline (phen),2,2′ bipyridyl (bpy),and L tryptophane (trp).The stability difference between the ternary complexes and the binary complexes has been compared and discussed.The increased stability in the ternary mixed ligand complexes was attributed to the cooperative effect of π A-π B and the intramolecular ligand ligand aromatic ring stacking interaction.The extent of the intramolecular aromatic ring stacking interaction in the ternary calcium complexes was calculated,which is in accord with the size of the aromatic rings forming stacks.