Materials Data on KNb2Cl11 by Materials Project
KNbCl6NbCl5 crystallizes in the triclinic P-1 space group. The structure is two-dimensional and consists of one NbCl5 cluster and one KNbCl6 sheet oriented in the (0, 0, 1) direction. In the NbCl5 cluster, Nb5+ is bonded to six Cl1- atoms to form edge-sharing NbCl6 octahedra. There are a spread of Nb–Cl bond distances ranging from 2.29–2.61 Å. There are five inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a single-bond geometry to one Nb5+ atom. In the second Cl1- site, Cl1- is bonded in a single-bond geometry to one Nb5+ atom. In the third Cl1- site, Cl1- is bonded in a single-bond geometry to one Nb5+ atom. In the fourth Cl1- site, Cl1- is bonded in a single-bond geometry to one Nb5+ atom. In the fifth Cl1- site, Cl1- is bonded in a water-like geometry to two equivalent Nb5+ atoms. In the KNbCl6 sheet, K1+ is bonded in a 11-coordinate geometry to eleven Cl1- atoms. There are a spread of K–Cl bond distances ranging from 3.40–3.75 Å. Nb5+ is bonded in an octahedral geometry to six Cl1- atoms. There are a spread of Nb–Cl bond distances ranging from 2.30–2.53 Å. There are six inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a 1-coordinate geometry to four equivalent K1+ and one Nb5+ atom. In the second Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two equivalent K1+ and one Nb5+ atom. In the third Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two equivalent K1+ and one Nb5+ atom. In the fourth Cl1- site, Cl1- is bonded in a single-bond geometry to one Nb5+ atom. In the fifth Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two equivalent K1+ and one Nb5+ atom. In the sixth Cl1- site, Cl1- is bonded in a distorted single-bond geometry to one K1+ and one Nb5+ atom.