https://scholar.dgist.ac.kr/handle/20.500.11750/811 2026-04-08T15:03:16Z https://scholar.dgist.ac.kr/handle/20.500.11750/59328 Title: Cooperative Metal Ion Combinations in Ti-Based Multivariate Metal-Organic Frameworks Author(s): Seo, Eunho; Kim, Mijin; Byun, Asong; Lim, Subin; Moon, Dohyun; Oh, Hyunchul; Park, Jinhee Abstract: Multivariate metal-organic frameworks (MTV-MOFs), which incorporate multiple metal ions or organic linkers within a single framework, provide a powerful platform for investigating structure-composition-property relationships, which in turn enable the rational tuning of material performance. To establish such a correlation, it is critical to achieve precise compositional control while maintaining high crystallinity, thereby minimizing variability in crystallinity and disorder as confounding factors. We report a family of titanium-based multivariate metal-organic frameworks (MTV-MOFs), Ti2M4(mu 3-O)2pbpta3 (designated DGIST-14; M = Ni2+, Co2+, Mn2+), in which various combinations of transition metal ions are integrated into heterometallic clusters within highly crystalline soc-topology frameworks. Based on the hypothesis that Ti4+, a hard acid, can direct the formation of robust frameworks through strong interactions with hard basic carboxylate linkers, we aim to incorporate soft M2+ without compromising structural integrity. This approach facilitates the integration of diverse transition metal ions with precise control over metal ratios. The synergy among the metal centers leads to substantial improvements in structural stability, surface area (up to similar to 4600 m2/g), and gas uptake (up to similar to 1677 cm3/g). Notably, the controlled incorporation of Ni2+ and Mn2+ ions enables the selective generation of singlet oxygen under visible-light via a metal-composition-dependent pathway. This work establishes a structure-composition-function relationship in Ti-based MTV-MOFs and demonstrates a design strategy that leverages cooperative metal-ion combinations to simultaneously optimize framework stability and photoactivity. 2025-10-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/59077 Title: 다공성 금속-유기 프레임워크 기반 색 센서와 그 제조 방법 Author(s): 진강우; 박진희 Abstract: 본 발명은 다공성 금속-유기 프레임워크 기반 색 센서와 그 제조 방법을 개시한다. 본 발명은 기판; 및 상기 기판 상에 제공되며, 다공성 금속-유기 프레임워크와 적어도 하나의 전처리 용매가 결합된 센서 물질을 포함하고, 상기 다공성 금속-유기 프레임워크는 중심금속이온으로 구리와 디메틸 아미노 아조벤젠 작용기를 갖는 링커를 포함하고, 상기 센서 물질은 휘발성 유기 화합물 그리고 수분에 반응하여 색 변화를 일으키는 것을 특징으로 한다. 본 발명의 실시예에 따르면, 색 센서용 MOF 제조, 색 센서용 MOF에 다양한 전처리를 통한 센서 어레이 구성, 다양한 유기 화합물의 종류 판별, 유기 화합물의 정량분석이 가능하다. https://scholar.dgist.ac.kr/handle/20.500.11750/58986 Title: Organic-Inorganic Hybrids for their energy applications Author(s): Park, Jinhee; Zhou, Hongcai 2016-08-21T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/58965 Title: Targeted Selenite Adsorption Using Defective Fe-BTC: Effective in Acidic and Alkaline Conditions Author(s): Byun, Asong; Lee, Byeoksong; Jeong, Yujin; Kang, Joongoo; Park, Jinkyu; Park, Jinhee Abstract: Amorphous Fe-BTC, characterized by entirely defective metal nodes, has been employed for the effective adsorption of toxic selenite anions from aqueous solutions. Remarkably, Fe-BTC maintains high adsorption efficiency across a broad pH range (2-12), achieving a maximum adsorption capacity of 491 mg g-1, ranking among the highest recorded for adsorbents, including MOFs. The adsorption process involves distinct chemical interactions depending on pH: weak and variable interactions under acidic conditions (pH 2) and strong, diverse coordination modes under alkaline conditions (pH 11). Notably, the strong coordination ability of selenite ensures high selectivity over selenate and competing anions such as Cl-, NO2-, NO3-, CO32-, SO42-, and PO43-. The abundance of metal defects endows Fe-BTC with superior adsorption capacity compared to crystalline Fe-MOF, MIL-100(Fe). This study provides a comparative analysis of selenite adsorption on Fe-BTC under acidic and alkaline conditions, emphasizing pH-dependent adsorption mechanisms and their implications for designing effective adsorbents for toxic species removal. 2025-08-31T15:00:00Z