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M II (C 4 H 12 N 2 )[B 2 P 3 O 12 (OH)] (M II = Co, Zn): Synthesis and Crystal Structure of Novel Open Framework Borophosphates
Author(s) -
Schäfer Gerd,
Borrmann Horst,
Kniep Rüdiger
Publication year - 2001
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200101)627:1<61::aid-zaac61>3.0.co;2-o
Subject(s) - orthorhombic crystal system , octahedron , crystallography , crystal structure , chemistry , hydrothermal circulation , hydrothermal synthesis , protonation , hydrothermal reaction , stereochemistry , ion , chemical engineering , organic chemistry , engineering
Two novel borophosphates, M II (C 4 H 12 N 2 )[B 2 P 3 O 12 (OH)] (M II = Co, Zn), exhibiting open frameworks, have been synthesized by hydrothermal reactions (T = 165 °C). The crystal structures of the isotypic compounds have been determined both at 293 K (orthorhombic, Ima 2 (no. 46), Z = 4; M II = Co: a = 12.4635(4) Å, b = 9.4021(4) Å, c = 11.4513(5) Å, V = 1341.90 Å 3 , R 1 = 0.0202, wR 2 = 0.0452, 2225 observed reflections with I > 2σ(I); M II = Zn: a = 12.4110(9) Å, b = 9.4550(5) Å, c = 11.4592(4) Å, V = 1344.69 Å 3 , R 1 = 0.0621, wR 2 = 0.0926, 1497 observed reflections with I > 2σ(I)). Distorted CoO 6 ‐octahedra and ZnO 5 ‐square‐pyramids, respectively, share common oxygen‐corners with BO 4 ‐, PO 4 ‐ and (HO)PO 3 ‐tetrahedra. The tetrahedral groups are linked via common corners to form infinite loop‐branched borophosphate chains $^1_\infty$ [B 2 P 3 O 12 (OH) 4– ]. The open framework of M II ‐coordination polyhedra and tetrahedral borophosphate chains contains a three‐dimensional system of interconnected structural channels running along [100], [011] and [011], respectively, which are occupied by di‐protonated piperazinium ions.