近日，天津理工大学李从刚团队报道了具有增强各向异性的高铁磺酸盐双折射晶体的阳离子-硫驱动降维工程。相关论文于2026年5月7日发表在《结构化学》杂志上。

双折射晶体对先进光子技术至关重要，但通过合理的结构设计实现显著的光学各向异性仍是一项挑战。

研究组提出了一种多尺度结构工程策略，将各向异性功能构筑基元与阳离子-硫介导的维度调控相耦合，以增强光学各向异性。通过调控不同阳离子与硫之间的空间匹配以引发结构演化，他们发现了三种新型双折射晶体：K₄(2-ABS)₄·H₂O (I)、Rb₄(2-ABS)₄·H₂O (II) 和 Cs(2-ABS) (III)。值得注意的是，从准二维层状排列（I 和 II）到准一维链（III）的结构演化，使得双折射率在532 nm处从0.167和0.155显著增强至 0.344，比 K₂SO₄ 大近两个数量级，并超过了广泛使用的商业化双折射晶体。

结构分析与第一性原理计算揭示，从准二维骨架（I 和 II）到准一维结构（III）的维度转变过程中，维度降低与 [2-ABS]? 固有的极化率各向异性协同作用，显著增强了双折射。这项工作证明了多尺度结构调控作为双折射晶体结构设计原理的有效性和广泛适用性。

附：英文原文

Title: Cation-sulfur-driven dimensional reduction engineering for tai-loring sulfonate birefringent crystals with enhanced anisotropy

Author: anonymous

Issue&Volume: 2026-05-07

Abstract: Birefringent crystals are critical for advanced photonic technologies, yet achieving substantial optical anisotropy through rational structural design remains a challenge. Herein, we propose a multiscale structural engineering strategy that couples anisotropic functional building units (FBUs) with cation-sulfur mediated dimensional modulation to enhance optical anisotropy. Three new birefringent crystals, K4(2-ABS)4·H2O (I), Rb4(2-ABS)4·H2O (II), and Cs(2-ABS) (III) were identified by mediating the spatial matching between distinct cations and sulfurs to trigger structural evolution. Notably, the structural evolution from a quasi-2D layered arrangement (I and II) to a quasi-1D chain (III) leads to a significant enhancement in birefringence from 0.167 and 0.155 to 0.344 at 532 nm, nearly two orders of magnitude larger than that of K2SO4 and exceeding widely used commercial birefringent crystals. Structural analysis and first-principles calculations reveal a distinct dimensional transition from quasi-2D frameworks (I and II) to a quasi-1D structure (III), where dimensional reduction synergistically cooperates with the intrinsic polarizability anisotropy of [2-ABS]- to markedly enhance birefringence. This work demonstrates the effectiveness and general applicability of multiscale structural modulation as a design principle for birefringent crystal architectures.

DOI: 10.1016/j.cjsc.2026.100970

Source: http://cjsc.ac.cn/cms/issues/1045