Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Nitrate Sensing With Molecular Cage Ionophores: a Potentiometric Approach(Royal Soc Chemistry, 2025) Onder, Ahmet; Begar, Ferit; Kibris, Erman; Buyukcakir, Onur; Yildiz, Umit HakanNitrate ions are widespread environmental pollutants in water and soil, posing critical risks to both human health and ecosystems. This study introduces a molecular cage as a novel ionophore for potentiometric nitrate-selective ion-selective electrodes (ISEs) designed for enhanced specificity and sensitivity. Among six synthetic candidates, the electrode incorporating a 1,3,5-tri(p-hydroxyphenyl)benzene-based chlorotriazine pillared cage molecule (CAGE-1) exhibited superior performance, characterized by a linear response in the nitrate concentration range of 1.0 x 10-5 to 1.0 x 10-1 M, with a high coefficient of determination (R2 = 0.9971) and a slope of -53.1 +/- 1.4 mV dec-1. The electrode also achieved a limit of detection of 7.5 x 10-6 M. These findings highlight the potential of molecular cages as ionophores for nitrate sensing in environmental applications.Article Citation - WoS: 15Citation - Scopus: 15Synthesis of Triazole-Linked Porous Cage Polymers: Modulating Cage Size for Tailored Iodine Adsorption(Amer Chemical Soc, 2024) Begar, Ferit; Erdogmus, Mustafa; Gecalp, Yasmin; Canakci, Utku Cem; Buyukcakir, OnurWe present the synthesis of two triazole-linked porous cage polymers (pCAGEs) using two D-3h symmetric shape-persistent organic cages of different sizes as monomers. We observed that expanding the size of the cage monomer resulted in an improved surface area, pore volume, and iodine vapor uptake capacity of up to 4.02 g g(-1) at 75 degrees C under ambient pressure. Also, embedding molecular organic cages into pCAGEs boosted their iodine adsorption performances compared to their discrete molecular counterparts, model compounds (mCAGEs), due to their open pore channels, enabling the efficient diffusion of iodine into the binding sites. The pCAGEs showed promising iodine adsorption efficiencies from a concentrated KI/I-2 aqueous solution with a high iodine uptake capacity of up to 3.35 g g(-1). The iodine uptake capacities of pCAGEs differ in vapor and aqueous solutions, which suggests that tuning the cage size allows us not only to control the textural properties of pCAGEs but also to tailor their iodine adsorption performances in vapor and water. Iodine adsorption mechanisms of pCAGEs were investigated using ex situ structural characterization techniques, revealing strong interactions of adsorbed iodine species with nitrogen-rich groups and phenyl rings of the pCAGEs. Notably, pCAGEs demonstrated remarkable regeneration and reusability, maintaining 86% of their initial adsorption capacities over five adsorption/desorption cycles, highlighting their potential for practical applications. These findings contribute to a fundamental understanding of the structure-property relationship for cage-based polymeric materials and provide insights into the development of high-performance adsorbents for iodine capture.Article Citation - WoS: 41Citation - Scopus: 44Ultralong-Life Quinone-Based Porous Organic Polymer Cathode for High-Performance Aqueous Zinc-Ion Batteries(American Chemical Society, 2023) Büyükçakır, Onur; Yüksel, Recep; Begar, Ferit; Erdoğmuş, Mustafa; Arsakay, Madi; Lee, Sun Hwa; Kim, Sang OukWe synthesized and studied a redox-active quinone-basedporousorganic polymer (rPOP) and found ultralong cycle life: it is a promisingorganic cathode for aqueous zinc-ion batteries (ZIBs). It has highphysicochemical stability and enhanced intrinsic conductivity fromits fused-aromatic conjugated skeleton. rPOP's high porosityallows for efficient Zn2+ infiltration through the poresduring charging-discharging cycles and contributes to the efficientutilization of redox-active quinone units. It delivers a specificcapacity of 120 mAh g(-1) at a current density of0.1 A g(-1) with a flat and long discharge plateau,which is critically important to provide a stable voltage output.It provides ultralong cycle life at a current density of 1.0 A g(-1) for 1000 and at 2.0 A g(-1) for 30 000cycles, with initial capacity retention of 95 and 66%, respectively.The co-insertion (Zn2+ and H+) charge storagemechanism was investigated using various electrochemical measurementsand ex/in situ structural characterization techniques, and is explainedherein. These findings contribute to a better understanding of thestructure-property relationship for rPOP and open a new avenuefor new organic cathode materials for high-performance next-generationaqueous batteries.