title: Poly[[triaqua-(μ(3)-4-oxidopyridine-2,6-dicarboxyl-ato)holmium(III)] mono-hydrate].
abstract: In the title coordination polymer, {[Ho(C(7)H(2)NO(5))(H(2)O)(3)]·H(2)O}(n), the Ho(III) atom is eight-coordinated by a tridentate 4-oxidopyridine-2,6-dicarboxyl-ate trianion, two monodentate anions and three water mol-ecules, forming a distorted bicapped trigonal-prismatic HoNO(7) coordination geometry. The anions bridge adjacent Ho(III) ions into double chains. Adjacent chains are further connected into sheets. O-H⋯O hydrogen bonds involving both coordinated and uncoordinated water mol-ecules generate a three-dimensional supra-molecular framework.
authors.forename: Zhu-Qing
authors.initials: ZQ
authors.lastname: Gao
authors.forename: Dong-Yu
authors.initials: DY
authors.lastname: Lv
authors.forename: Jin-Zhong
authors.initials: JZ
authors.lastname: Gu
authors.forename: Hong-Jin
authors.initials: HJ
authors.lastname: Li