The kagome lattice, composed of a planar array of corner-sharing triangles, is one of the most geometrically frustrated lattices. The realization of a spin S = 1/2 kagome lattice antiferromagnet is of particular interest because it may host an exotic form of matter, a quantum spin liquid state, which shows long-range entanglement and no magnetic ordering down to 0 K. A few S = 1/2 kagome lattice antiferromagnets exist, typically based on Cu²⁺, d⁹ compounds, though they feature structural imperfections. Herein, we present the synthesis of (CH₃NH₃)₂NaTi₃F₁₂, which comprises an S = 1/2 kagome layer that exhibits only one crystallographically distinct Ti³⁺, d¹ site, and one type of bridging fluoride. A static positional disorder is proposed for the interlayer CH₃NH₃⁺. No structural phase transitions were observed from 1.8 K to 523 K. Despite its spin-freezing behaviour, other features—including its negative Curie–Weiss temperature and a lack of long-range ordering—imply that this compound is a highly frustrated magnet with unusual magnetic phase behaviours.

由角共享三角形的平面阵列组成的kagome晶格是几何形状最受挫的晶格之一。自旋S  = 1/2 kagome晶格反铁磁体的实现特别受关注，因为它可能包含一种奇异的物质，一种量子自旋液体状态，该状态显示出长程纠缠，并且在0 K以下都没有磁序。尽管存在结构缺陷，但 通常存在基于S 2，1/2 kagome晶格反铁磁体，通常基于Cu 2 ⁺，d ⁹化合物。在这里，我们介绍了（CH ₃ NH ₃）₂ NaTi ₃ F ₁₂的合成，其中包括S ＝ 1 / 2kagome层，其仅表现出一个晶体学上不同的Ti ³⁺，d ¹位点和一种桥接氟化物。针对中间层CH ₃ NH ₃ ⁺提出了静态位置混乱。从1.8 K到523 K均未观察到结构相变。尽管其具有自旋冻结特性，但其他特征（包括其居里-魏斯温度为负值和缺乏长程有序性）意味着该化合物是高度受挫的磁体，具有异常磁相行为。