Materials Data on Na2Pr4Br9NO by Materials Project

Abstract

Na2Pr4NOBr9 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to six Br1- atoms to form a mixture of distorted edge and corner-sharing NaBr6 pentagonal pyramids. There are a spread of Na–Br bond distances ranging from 3.00–3.16 Å. In the second Na1+ site, Na1+ is bonded to six Br1- atoms to form a mixture of distorted edge and corner-sharing NaBr6 pentagonal pyramids. There are a spread of Na–Br bond distances ranging from 2.98–3.18 Å. There are four inequivalent Pr3+ sites. In the first Pr3+ site, Pr3+ is bonded in a 2-coordinate geometry to one N3-, one O2-, and six Br1- atoms. The Pr–N bond length is 2.36 Å. The Pr–O bond length is 2.42 Å. There are a spread of Pr–Br bond distances ranging from 3.04–3.25 Å. In the second Pr3+ site, Pr3+ is bonded in a 2-coordinate geometry to one N3-, one O2-, and six Br1- atoms. The Pr–N bond length is 2.35 Å. The Pr–O bond length is 2.41 Å. There are a spread of Pr–Br bond distances ranging from 3.00–3.32 Å. In the third Pr3+ site, Pr3+ is bonded in a 2-coordinate geometry to one N3-, one O2-, and four Br1- atoms. The Pr–N bond length is 2.31 Å. The Pr–O bond length is 2.42 Å. There are a spread of Pr–Br bond distances ranging from 3.05–3.22 Å. In the fourth Pr3+ site, Pr3+ is bonded in a 2-coordinate geometry to one N3-, one O2-, and four Br1- atoms. The Pr–N bond length is 2.36 Å. The Pr–O bond length is 2.36 Å. There are one shorter (3.10 Å) and three longer (3.14 Å) Pr–Br bond lengths. N3- is bonded to four Pr3+ atoms to form NPr4 tetrahedra that share edges with two equivalent OPr4 tetrahedra. O2- is bonded to four Pr3+ atoms to form distorted OPr4 tetrahedra that share edges with two equivalent NPr4 tetrahedra. There are nine inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 2-coordinate geometry to two Na1+ and two Pr3+ atoms. In the second Br1- site, Br1- is bonded in a 2-coordinate geometry to two Na1+ and two Pr3+ atoms. In the third Br1- site, Br1- is bonded in a rectangular see-saw-like geometry to two Na1+ and two Pr3+ atoms. In the fourth Br1- site, Br1- is bonded in a 3-coordinate geometry to three Pr3+ atoms. In the fifth Br1- site, Br1- is bonded in a 4-coordinate geometry to one Na1+ and two Pr3+ atoms. In the sixth Br1- site, Br1- is bonded in a 4-coordinate geometry to one Na1+ and two Pr3+ atoms. In the seventh Br1- site, Br1- is bonded in a 3-coordinate geometry to three Pr3+ atoms. In the eighth Br1- site, Br1- is bonded in a distorted see-saw-like geometry to two Na1+ and two Pr3+ atoms. In the ninth Br1- site, Br1- is bonded in a distorted see-saw-like geometry to two Na1+ and two Pr3+ atoms.