The discovery of another monoclinic polymorph in the niobium trisulfide system expands the structural possibilities for quasi-1D transition metal trichalcogenide materials. We describe here NbS3-VI prepared by chemical vapor transport (CVT) using ammonium chloride as the transport agent rather than the typical iodine or excess chalcogen. This example establishes precedent for transport agent control over CVT product polymorphism, thereby opening an alternative avenue for structural engineering. The single crystal x-ray diffraction structure of NbS3-VI shows that this polymorph unexpectedly incorporates features of both NbS3-IV and NbS3-V; specifically, NbS3-VI contains corrugated chains with paired Nb–Nb and uniform chains with unpaired, equidistant Nb centers. We also use single crystal x-ray diffraction to compare NbS3-VI with (Nb0.6Ti0.4)S3, which contains solely uniform chains with slightly shorter metal–metal distances than those of uniform NbS3-VI chains.

中文翻译：

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化学气相传输剂对准一维 NbS3 体系多晶型的影响

三硫化铌系统中另一种单斜多晶型物的发现扩展了准一维过渡金属三硫化物材料的结构可能性。我们在这里描述了使用氯化铵作为传输剂而不是典型的碘或过量硫属元素通过化学气相传输 (CVT) 制备的 NbS3-VI。这个例子开创了运输代理控制 CVT 产品多态性的先例，从而为结构工程开辟了一条替代途径。NbS3-VI 的单晶 X 射线衍射结构表明，该多晶型物出人意料地结合了 NbS3-IV 和 NbS3-V 的特征；具体而言，NbS3-VI 包含具有成对 Nb-Nb 的波纹链和具有未成对、等距 Nb 中心的均匀链。我们还使用单晶 X 射线衍射来比较 NbS3-VI 与 (Nb0.6Ti0.4)S3，