The invention provides luminescent Ru(ll) complexes that can be used in pH sensors to provide pH sensitivity over a wide pH range. The complexes have at least one polypyridyl ligand having at least one proton-accepting group with a pKa in the range 4 to less than 6, wherein the luminescence intensity and/or luminescence lifetime of the complex varies depending on the protonation state of the proton-accepting group; and at least one polypyridyl ligand having at least one proton-donating group with a pKa in the range 6 to 8, wherein the at least one proton-donating group is covalently linked to a ring carbon atom of the at least one polypyridyl ligand by a spacer group having the formula -(CH2)q- wherein q may be 1, 2, or 3, and wherein the luminescence intensity and/or luminescence lifetime of the complex varies depending on the protonation state of the proton-donating group.
该发明提供了可用于pH传感器的发光Ru(ll)配合物,可在广泛的pH范围内提供pH敏感性。这些配合物至少具有一个多
吡啶配体,其具有至少一个pKa在4到小于6的质子受体基团,其中复合物的发光强度和/或发光寿命取决于质子受体基团的质子化状态;以及至少具有一个多
吡啶配体,其具有至少一个pKa在6到8的质子供体基团,其中至少一个质子供体基团通过具有式-(
CH2)q-的间隔基团与至少一个多
吡啶配体的环碳原子共价连接,其中q可以为1、2或3,且复合物的发光强度和/或发光寿命取决于质子供体基团的质子化状态。