TY - JOUR
T1 - Synthesis, structure, and magnetic property of a new open-framework manganese borophosphate, [NH4]4[Mn9B 2(OH)2(HPO4)4(PO4) 6]
AU - Yang, Miao
AU - Yu, Jihong
AU - Shi, Lei
AU - Chen, Peng
AU - Li, Guanghua
AU - Chen, Yan
AU - Xu, Ruren
AU - Gao, Song
PY - 2006/1/24
Y1 - 2006/1/24
N2 - A new three-dimensional (3-D) manganese(II) borophosphate, [NH 4]4[Mn9B2(OH)2(HPO 4)4(PO4)6] (denoted MnBPO-CJ26), has been synthesized by a hydrothermal method. The structure has been determined by single-crystal X-ray diffraction. It crystallizes in the monoclinic space group C2/c (No. 15) with a = 32.603(7) Å, b= 10.617(2) Å, c = 10.718(2) Å, and β = 108.26(3)°. Its structure features anionic manganese-phosphate layers [Mn9(OH)2(HPO4) 4(PO4)6]10-, which are made up from MnO5, MnO6, PO4, and HPO4 polyhedral units. These anionic layers, parallel to the bc plane, are further connected by BO4 tetrahedra through vertex oxygen atoms forming a novel open framework with 2-D eight-membered ring (8-MR) channels along the [010] and [001] directions. Charge neutrality is achieved by protonated NH3 molecules. The structure has unique B/P and Mn/P ratios (B/P = 1/5, Mn/P = 9/10). Magnetic measurements indicate that Curie - Weiss behavior above 100 K with C = 4.404(3) cm3 mol-1 K and θ = -51.2(5) K. The value of C is consistent with an S = 5/2 ion with g ∼ 2.0 (4.38 cm 3 mol-1 K). However, the magnetic data reveal a spontaneous magnetization at 8.0 K, indicating a canting of Mn2+ moments in the antiferromagnetic ground state.
AB - A new three-dimensional (3-D) manganese(II) borophosphate, [NH 4]4[Mn9B2(OH)2(HPO 4)4(PO4)6] (denoted MnBPO-CJ26), has been synthesized by a hydrothermal method. The structure has been determined by single-crystal X-ray diffraction. It crystallizes in the monoclinic space group C2/c (No. 15) with a = 32.603(7) Å, b= 10.617(2) Å, c = 10.718(2) Å, and β = 108.26(3)°. Its structure features anionic manganese-phosphate layers [Mn9(OH)2(HPO4) 4(PO4)6]10-, which are made up from MnO5, MnO6, PO4, and HPO4 polyhedral units. These anionic layers, parallel to the bc plane, are further connected by BO4 tetrahedra through vertex oxygen atoms forming a novel open framework with 2-D eight-membered ring (8-MR) channels along the [010] and [001] directions. Charge neutrality is achieved by protonated NH3 molecules. The structure has unique B/P and Mn/P ratios (B/P = 1/5, Mn/P = 9/10). Magnetic measurements indicate that Curie - Weiss behavior above 100 K with C = 4.404(3) cm3 mol-1 K and θ = -51.2(5) K. The value of C is consistent with an S = 5/2 ion with g ∼ 2.0 (4.38 cm 3 mol-1 K). However, the magnetic data reveal a spontaneous magnetization at 8.0 K, indicating a canting of Mn2+ moments in the antiferromagnetic ground state.
UR - http://www.scopus.com/inward/record.url?scp=33644541771&partnerID=8YFLogxK
U2 - 10.1021/cm052170m
DO - 10.1021/cm052170m
M3 - Article
AN - SCOPUS:33644541771
SN - 0897-4756
VL - 18
SP - 476
EP - 481
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 2
ER -