{"knowledge_schema": {"broad_category": "Chemistry \u2192 Material Science \u2192 Liquid Crystals", "refinement": "This problem focuses on designing liquid crystal materials with specific phase behaviors and transition temperatures using molecular structures based on a single benzene ring.", "specific_scope": "The task involves creating a molecular design that meets the criteria for nematic or smectic phases with transition temperatures around room temperature, utilizing a single benzene ring as the core.", "goal": "Develop a molecular structure that satisfies the requirements for liquid crystal behavior and transition temperatures, allowing for fine-tuning through chain length and substituents."}, "summary": "This design task involves creating liquid crystal materials with nematic or smectic phases using a single benzene ring as the core structure. The goal is to achieve transition temperatures around room temperature (20-25\u00b0C) by incorporating a flexible alkyl chain and a polar group, while also considering lateral substituents for fine-tuning. The proposed general structure is CnH2n+1-Ph-CN, where adjustments to the alkyl chain length and substituents can help achieve the desired thermal properties."}