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Автор: Grafiati

Опубліковано: 7 вересня 2023

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1

Asefa, Tewodros, and Zhimin Tao. "Mesoporous silica and organosilica materials — Review of their synthesis and organic functionalization." Canadian Journal of Chemistry 90, no. 12 (December 2012): 1015–31. http://dx.doi.org/10.1139/v2012-094.

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Анотація:

Mesoporous silica and organosilica materials are a class of nanostructured materials that have porous structures with tunable nanometer pores, large surface areas, high pore volumes, and, in some cases, well-ordered mesostructures. Furthermore, in the case of mesoporous organosilicas, the materials possess various types of organic functional groups. This review highlights the different synthetic methods developed for mesoporous silica and organosilica nanomaterials. The review also discusses the various synthetic strategies used to functionalize the surfaces of mesoporous silica materials and produce highly functionalized mesoporous materials. Rational design and synthetic methods developed to place judiciously chosen one or more than one type of functional group(s) on the surfaces of mesoporous silica materials and generate monofunctional and multifunctional mesoporous silica materials are also introduced. These organic functionalization methods have made possible the synthesis of organically functionalized mesoporous silicas and mesoporous organosilicas with various interesting properties and many potential applications in different areas, ranging from catalysis to drug delivery and biosensing.

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2

Lin, Chun Xiang Cynthia, Siddharth Jambhrunkar, Pei Yuan, Chun Hui Clayton Zhou, and George Xiu Song Zhao. "Design and synthesis of periodic mesoporous organosilica materials with a multi-compartment structure." RSC Advances 5, no. 109 (2015): 89397–406. http://dx.doi.org/10.1039/c5ra16497d.

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3

Kaczmarek, Anna M., and Pascal Van Der Voort. "Light-Emitting Lanthanide Periodic Mesoporous Organosilica (PMO) Hybrid Materials." Materials 13, no. 3 (January 24, 2020): 566. http://dx.doi.org/10.3390/ma13030566.

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Periodic mesoporous organosilicas (PMOs) have a well ordered mesoporous structure, a high thermal and mechanical stability and a uniform distribution of organic functionalities in the pore walls. The organic groups allow PMOs to be modified and functionalized by using a wide range of organic reactions. Since their first report in 1999, PMOs have found a vast range of applications, such as for catalysis, adsorbents, low-k films, biomedical supports and also for optical applications. Optical applications are very interesting as PMOs offer the possibility of designing advanced luminescent hybrid materials comprising of organic components, yet with much higher stability and very good processability. Despite their promising possibilities, the optical properties of pristine PMOs and PMOs grafted with d-metal or f-metal ions and complexes have been explored less frequently. In this review, we aimed to overview the exciting light emitting properties of various reported lanthanide PMO hybrid materials and interest the reader in this promising application for lanthanide PMO materials.

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4

Shen, Luying, Shan Pan, Dechao Niu, Jianping He, Xiaobo Jia, Jina Hao, Jinlou Gu, Wenru Zhao, Pei Li, and Yongsheng Li. "Facile synthesis of organosilica-capped mesoporous silica nanocarriers with selective redox-triggered drug release properties for safe tumor chemotherapy." Biomaterials Science 7, no. 5 (2019): 1825–32. http://dx.doi.org/10.1039/c8bm01669k.

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5

Gunathilake, Chamila, Chandrakantha Kalpage, Murthi Kadanapitiye, Rohan S. Dassanayake, Amanpreet S. Manchanda, and Mahinda Gangoda. "Facile Synthesis and Surface Characterization of Titania-Incorporated Mesoporous Organosilica Materials." Journal of Composites Science 3, no. 3 (August 1, 2019): 77. http://dx.doi.org/10.3390/jcs3030077.

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Titania-incorporated organosilica-mesostructures (Ti-MO) were synthesized using tris [3-(trimethoxysilyl)propyl]isocyanurate, tetraethylorthosilicate as silica precursors, and titanium isopropoxide as the titanium precursor via a co-condensation method in the presence of the triblock copolymer, Pluronic P123. The triblock copolymer was completely removed by extraction with a 95% ethanol solution, followed by a thermal treatment at 350 °C under flowing nitrogen without decomposing isocyanurate bridging groups. The molar ratio of titanium to silica in the mesostructures was gradually changed by increasing the amount of tetraethylorthosilicate in the initial reaction mixture. Our synthesis strategy also allowed us to tailor both adsorption and structural properties, including a well-developed specific surface area, high microporosity, and large pore volume. A portion of the samples was thermally treated at 600 °C to remove both the block copolymer and bridging groups. The thermal treatment at 600 °C was used to convert the amorphous titania into a crystalline anatase form. The Ti-MO materials were characterized using a N2 adsorption desorption analysis, thermogravimetric analysis (TGA), solid state nuclear magnetic resonance (NMR), transmission electron microscope (TEM), and X-ray powder diffraction (XRD). CO2 adsorption studies were also conducted to determine the basicity of the Ti-MO materials. The effect of the surface properties on the CO2 sorption was also identified.

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6

Qiao, S. Z., C. Z. Yu, W. Xing, Q. H. Hu, H. Djojoputro, and G. Q. Lu. "Synthesis and Bio-adsorptive Properties of Large-Pore Periodic Mesoporous Organosilica Rods." Chemistry of Materials 17, no. 24 (November 2005): 6172–76. http://dx.doi.org/10.1021/cm051735b.

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7

He, Qianjun, Limin Guo, Fangming Cui, Yu Chen, Peng Jiang, and Jianlin Shi. "Facile one-pot synthesis and drug storage/release properties of hollow micro/mesoporous organosilica nanospheres." Materials Letters 63, no. 22 (September 2009): 1943–45. http://dx.doi.org/10.1016/j.matlet.2009.06.014.

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8

Chebude, Yonas, Gutta Gonfa, and Isabel Díaz. "Preparation and characterization of vernolic acid methyl ester functionalized ordered mesoporous materials." Bulletin of the Chemical Society of Ethiopia 37, no. 3 (March 6, 2023): 689–702. http://dx.doi.org/10.4314/bcse.v37i3.12.

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ABSTRACT. Vernonia oil is a naturally epoxidized triglyceride oil extracted from the seed of Vernonia galamensis, a native plant in East Africa. After hydrolysis to vernolic acid (VA) and derivatization, vernolic acid methyl ester (VAME) is synthesized and used to functionalize ordered mesoporous materials (OMM). Al-MCM-41 with Si/Al ratio of 15, pure silica SBA-15 and periodic mesoporous organosilica (PMO) are employed as supports exploring the different surface properties. Following optimization of the VAME/OMM ratios, selected samples, i.e. those with 13% VAME, were impregnated with AgNO3 in NaBH4 to obtain Ag-nanoparticles. The final AgVAME-OMM potential catalysts were characterized by transmission electron microscopy, observing an efficient loading of Ag nanoparticles in pure silica SBA-15 with VAME with 500 m2 specific surface area and 6 nm pore size. KEY WORDS: Vernolic acid methyl ester, Vernonia oil, Functionalization, Ordered mesoporous materials, Catalysis Bull. Chem. Soc. Ethiop. 2023, 37(3), 689-702. DOI: https://dx.doi.org/10.4314/bcse.v37i3.12

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9

Guo, Xianmin, Xiaomei Wang, Hongjie Zhang, Lianshe Fu, Huadong Guo, Jiangbo Yu, L. D. Carlos, and Kuiyue Yang. "Preparation and luminescence properties of covalent linking of luminescent ternary europium complexes on periodic mesoporous organosilica." Microporous and Mesoporous Materials 116, no. 1-3 (December 2008): 28–35. http://dx.doi.org/10.1016/j.micromeso.2008.03.007.

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10

Shirai, Soichi, Minoru Waki, Yoshifumi Maegawa, Yuri Yamada, and Shinji Inagaki. "Effects of pore surfaces on the electronic states of metal complexes formed on bipyridine periodic mesoporous organosilica." New Journal of Chemistry 43, no. 6 (2019): 2471–78. http://dx.doi.org/10.1039/c8nj06277c.

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11

Zou, Houbing, Runwei Wang, Zhiqiang Shi, Jinyu Dai, Zongtao Zhang, and Shilun Qiu. "One-dimensional periodic mesoporous organosilica helical nanotubes with amphiphilic properties for the removal of contaminants from water." Journal of Materials Chemistry A 4, no. 11 (2016): 4145–54. http://dx.doi.org/10.1039/c6ta00708b.

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One new class of one-dimensional highly uniform PMO helical nanotubes with a unique amphiphilic framework and perpendicular mesochannels in walls has been reportedviaa simple, efficient and controllable one-step strategy. These nanotubes show outstanding performance in the removal of hydrophobic contaminants from water.

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12

Weinberger, Manuel, Po-Hua Su, Herwig Peterlik, Mika Lindén, and Margret Wohlfahrt-Mehrens. "Biphenyl-Bridged Organosilica as a Precursor for Mesoporous Silicon Oxycarbide and Its Application in Lithium and Sodium Ion Batteries." Nanomaterials 9, no. 5 (May 16, 2019): 754. http://dx.doi.org/10.3390/nano9050754.

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Silicon oxycarbides (SiOC) are an interesting alternative to state-of-the-art lithium battery anode materials, such as graphite, due to potentially higher capacities and rate capabilities. Recently, it was also shown that this class of materials shows great prospects towards sodium ion batteries. Yet, bulk SiOCs are still severely restricted with regard to their electrochemical performance. In the course of this work, a novel and facile strategy towards the synthesis of mesoporous and carbon-rich SiOC will be presented. To achieve this goal, 4,4′-bis(triethoxysilyl)-1,1′-biphenyl was sol–gel processed in the presence of the triblock copolymer Pluronic P123. After the removal of the surfactant using Soxhlet extraction the organosilica material was subsequently carbonized under an inert gas atmosphere at 1000 °C. The resulting black powder was able to maintain all structural features and the porosity of the initial organosilica precursor making it an interesting candidate as an anode material for both sodium and lithium ion batteries. To get a detailed insight into the electrochemical properties of the novel material in the respective battery systems, electrodes from the nanostructured SiOC were studied in half-cells with galvanostatic charge/discharge measurements. It will be shown that nanostructuring of SiOC is a viable strategy in order to outperform commercially applied competitors.

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13

Lin, Feng, Myrjam Mertens, Pegie Cool, and Sabine Van Doorslaer. "Influence of Synthesis Conditions on Properties of Ethane-Bridged Periodic Mesoporous Organosilica Materials as Revealed by Spin-Probe EPR." Journal of Physical Chemistry C 117, no. 44 (October 25, 2013): 22723–31. http://dx.doi.org/10.1021/jp4061076.

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14

Zhao, Yuanjiang, Tianwen Bai, Yuhang Liu, Yichao Lv, Zhuxian Zhou, Youqing Shen, and Liming Jiang. "Encapsulation of Volatile Monoterpene Fragrances in Mesoporous Organosilica Nanoparticles and Potential Application in Fruit Preservation." Nanomaterials 13, no. 1 (December 25, 2022): 104. http://dx.doi.org/10.3390/nano13010104.

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In this work, we synthesized mesoporous silica nanoparticles (MSNs) and periodic mesoporous organosilica nanoparticles containing bridging groups of ethylene (E-PMO) and phenylene (P-PMO) and compared their adsorption properties using D-limonene (Lim), myrcene (Myr), and cymene (Cym) as model guest molecules. For the selected nanoparticles of ~100 nm in diameter, the loading capacity to the volatile fragrances was in the order of P-PMO < E-PMO < MSN, consistent with the trend of increasing total pore volume. For example, P-PMO, E-PMO, and MSN had a Lim uptake of 42.2 wt%, 47.3 wt%, and 62.7 wt%, respectively, which was close to their theoretical adsorption capacity. Under isothermal thermogravimetric analysis conditions (30 °C, a N2 flow of 1 mL min−1), the lowest fragrance release of ~56% over 24 h was observed for P-PMO, followed by E-PMO (74–80%), and MSN (~89%). The release kinetics of the fragrant molecules from MSN and PMO materials can be well described by first-order and Weibull models, respectively. Moreover, the incorporation of Lim-loaded P-PMO NPs in an aqueous solution of regenerated silk fibroin provided a composite coating material suitable for perishable fruit preservation. The active layer deposited on fruit peels using dip coating showed good preservation efficacy, enabling the shelf-life of mangoes in a highly humid and hot atmosphere (30–35 °C, 75–85% RH) to be extended to 6 days.

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15

Kuschel, Andreas, Martin Luka, Martin Wessig, Malte Drescher, Mikhail Fonin, Gillian Kiliani, and Sebastian Polarz. "Organic Ligands Made Porous: Magnetic and Catalytic Properties of Transition Metals Coordinated to the Surfaces of Mesoporous Organosilica." Advanced Functional Materials 20, no. 7 (March 29, 2010): 1133–43. http://dx.doi.org/10.1002/adfm.200902056.

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16

Liang, You, Sijin Wang, Yijia Yao, Siwen Yu, Ao Li, Yuanfeng Wang, Jiehui Song, and Zhongyang Huo. "Degradable Self-Destructive Redox-Responsive System Based on Mesoporous Organosilica Nano-Vehicles for Smart Delivery of Fungicide." Nanomaterials 12, no. 23 (November 29, 2022): 4249. http://dx.doi.org/10.3390/nano12234249.

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The development of stimuli-responsive controlled release formulations is a potential method of improving pesticide utilization efficiency and alleviating current pesticide-related environmental pollution. In this study, a self-destruction redox-responsive pesticide delivery system using biodegradable disulfide-bond-bridged mesoporous organosilica (DMON) nanoparticles as the porous carriers and coordination complexes of gallic acid (GA) and Fe(III) ions as the capping agents were established for controlling prochloraz (PRO) release. The GA–Fe(III) complexes deposited onto the surface of DMON nanoparticles could effectively improve the light stability of prochloraz. Due to the decomposition of GA–Fe(III) complexes, the nano-vehicles had excellent redox-responsive performance under the reducing environments generated by the fungus. The spreadability of PRO@DMON–GA–Fe(III) nanoparticles on the rice leaves was increased due to the hydrogen bonds between GA and rice leaves. Compared with prochloraz emulsifiable concentrate, PRO@DMON–GA–Fe(III) nanoparticles showed better fungicidal activity against Magnaporthe oryzae with a longer duration under the same concentration of prochloraz. More importantly, DMON–GA–Fe(III) nanocarriers did not observe obvious toxicity to the growth of rice seedlings. Considering non-toxic organic solvents and excellent antifungal activity, redox-responsive pesticide controlled release systems with self-destruction properties have great application prospects in the field of plant disease management.

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17

Guo, Xianmin, Huadong Guo, Lianshe Fu, Ruiping Deng, Wan Chen, Jing Feng, Song Dang, and Hongjie Zhang. "Synthesis, Spectroscopic Properties, and Stabilities of Ternary Europium Complex in SBA-15 and Periodic Mesoporous Organosilica: A Comparative Study." Journal of Physical Chemistry C 113, no. 6 (January 20, 2009): 2603–10. http://dx.doi.org/10.1021/jp8095488.

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18

Shi, Yiru, Jianye Fu, and Yannan Yang. "Effects of synthetic routes on the compositional and structural properties of dendritic mesoporous organosilica nanoparticles: The unexpected reversed “double-edged sword” role of reaction time." Microporous and Mesoporous Materials 294 (March 2020): 109914. http://dx.doi.org/10.1016/j.micromeso.2019.109914.

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19

Kumar, Ravi, and Nermin Seda Kehr. "3D-Printable Oxygen- and Drug-Carrying Nanocomposite Hydrogels for Enhanced Cell Viability." Nanomaterials 12, no. 8 (April 11, 2022): 1304. http://dx.doi.org/10.3390/nano12081304.

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Nanocomposite (NC) hydrogels have been widely studied due to their tunable biochemical/ physical properties for tissue engineering and biomedical applications. Nanoparticles (NPs) that can carry bioactive hydrophilic/hydrophobic molecules and provide sustained release within hydrogels are an ideal all-in-one-platform for local drug delivery applications. Dual delivery of different bioactive molecules is desired to achieve synergetic therapeutic effect in biomedical applications. For example, the co-administration of drug molecules and oxygen (O2) is an ideal choice to improve cell viability, while reducing the harmful effects of hypoxia. Therefore, we prepared drug-loaded O2-carrying periodic mesoporous organosilica (PMO-PFC) NPs and their 3D-printable hydrogel precursors based on gelatin methacryloyl (GelMa) to fabricate 3D-scaffolds to improve cell-viability under both normoxia (21% O2) and hypoxia (1% O2) conditions. We used rutin as the hydrophobic drug molecule to demonstrate that our O2-carrying PMO-PFC NPs can improve hydrophobic drug loading and their sustained delivery over 7 days, while supporting sustained O2-delivery for 14 days under hypoxia conditions. Furthermore, the fibroblast cells were interacted with NC hydrogel scaffolds to test their impact on cell-viability under both normoxia and hypoxia conditions. The improved rheological properties suggest the prepared NC hydrogels can be further tested or used as an injectable hydrogel. The improved mechanical properties and 3D printability of NC hydrogels indicate their potential use as artificial tissue constructs.

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20

Walcarius, Alain. "(Digital Presentation) Electrochemically Induced Sol-Gel Deposition." ECS Meeting Abstracts MA2022-02, no. 24 (October 9, 2022): 992. http://dx.doi.org/10.1149/ma2022-0224992mtgabs.

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Sol-gel electrochemistry has gained great popularity in the past decades, mostly because of the ease of formation of silica and organosilica films with tailor-made properties that can be advantageously exploited for several applications when coated on a suitable electrode surface. In particular, silica-based materials displaying a regular structure at the mesoporous level have been found to be very promising electrode modifiers [1-3] because they ensure fast mass transport processes [4], which are often rate-determining in electrochemistry. In this context, an original electrochemical method has been developed to indirectly generate sol-gel-derived (organo)silica thin films, with promising applications in the field of bioelectrochemistry and sensors and beyond. After a brief introduction to the field, this lecture will present the concept the electrochemically-assisted generation of sol-gel films [5], its interest for bioencapsulation and elaboration of electrochemical bioreactors [6-9], its suitability to get nanostructured electrode surfaces with preferential pore orientation [3,10,11], including their modification with organo-functional groups [3,12,13] and their permselective properties [14-16], and will end with promising applications in electroanalysis and sensors [17-20], electrocatalysis [20,21], energy storage [22] or electrochromism [23]. References [1] A. Walcarius, Chem. Soc. Rev., 42, 4098 (2013). [2] A. Walcarius, Curr. Opin. Electrochem., 10, 88 (2018). [3] A. Walcarius, Acc. Chem. Res., 54, 3563 (2021). [4] M. Etienne, Y. Guillemin, D. Grosso and A. Walcarius, Anal. Bioanal. Chem., 405, 1497 (2013). [5] E. Sibottier, S. Sayen, F. Gaboriaud and A. Walcarius, Langmuir, 22, 8366 (2006). [6] Z. Wang, M. Etienne, G.-W. Kohring, Y. Bon Saint Côme, A. Kuhn and A. Walcarius, Electrochim. Acta, 56, 9032 (2011). [7] Z. Wang, M. Etienne, F. Quilès, G.-W. Kohring and A. Walcarius, Biosensors Bioelectron., 32, 111 (2012). [8] I. Mazurenko, M. Etienne, G.-W. Kohring, F. Lapicque and A. Walcarius, Electrochim. Acta, 199, 342 (2016). [9] L. Zhang, M. Etienne, N. Vilà, T. X. H. Le, G.-W. Kohring and A. Walcarius, ChemCatChem, 10, 4067 (2018). [10] A. Walcarius, E. Sibottier, M. Etienne and J. Ghanbaja, Nature Mater., 6, 602 (2007). [11] A. Goux, M. Etienne, E. Aubert, C. Lecomte, J. Ghanbaja and A. Walcarius, Chem. Mater., 21, 731 (2009). [12] N. Vilà, J. Ghanbaja, E. Aubert and A. Walcarius, Angew. Chem. Int. Ed., 53, 2945 (2014). [13] N. Vilà, J. Ghanbaja and A. Walcarius, Adv. Mater. Interfaces, 3, 1500440 (2016). [14] N. Vilà, E. André, R. Ciganda, J. Ruiz, D. Astruc and A. Walcarius, Chem. Mater., 28, 2511 (2016). [15] C. Karman, N. Vilà and A. Walcarius, ChemElectroChem, 3, 2130 (2016). [16] N. Vilà, P. de Oliveira, A. Walcarius and I. M. Mbomekallé, Electrochim. Acta, 309, 209 (2019). [17] M. B. Serrano, C. Despas, G. Herzog and A. Walcarius, Electrochem. Commun., 52, 34 (2015). [18] T. Nasir, G. Herzog, L. Liu, M. Hébrant, C. Despas and A. Walcarius, ACS Sensors, 3, 484 (2018). [19] C. Karman, N. Vilà, C. Despas and A. Walcarius, Electrochim. Acta, 228, 659 (2017). [20] H. Maheshwari, N. Vilà, G. Herzog and A. Walcarius, ChemElectroChem, 7, 2095 (2020). [21] S. Ahoulou, N. Vilà, S. Pillet, D. Schaniel and A. Walcarius, Electroanalysis, 32, 690 (2020). [22] J. Wang, N. Vilà and A. Walcarius, Electrochim. Acta, 366, 137407 (2021). [23] W. Ullah, G. Herzog, N. Vilà and A. Walcarius, Faraday Discuss., 233, 77 (2022).

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21

Das, Pradip, Silvia Pujals, Lamiaa Ali, Magali Gary-Bobo, Lorenzo Albertazzi, and Jean-Olivier Durand. "Super-resolution imaging of antibody conjugated biodegradable periodic mesoporous organosilica nanoparticles for targeted chemotherapy of prostate cancer." Nanoscale, 2023. http://dx.doi.org/10.1039/d3nr01571h.

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Biodegradable periodic mesoporous organosilica nanoparticles (nanoPMOs) are widely used as responsive drug delivery platforms for targeted chemotherapy of cancer. However, the evaluation of their properties such as surface functionality and...

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22

Wu, Yue, Yangyi Sun, Chengyu Zhang, Mengyao He, and Dongming Qi. "Interfacial-assembly engineering of asymmetric magnetic-mesoporous organosilica nanocomposites with tunable architectures." Nanoscale, 2022. http://dx.doi.org/10.1039/d2nr03814e.

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Asymmetric morphology of nanomaterials plays a crucial role in regulating their physical and chemical properties, which can be tuned by two key factors: (i) interfacial interaction between seed particles and...

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23

Asefa, Tewodros, Neil Coombs, Hiltrud Grondey, Mietek Jaroniec, Michal Kruk, Mark J. MacLachlan, and Geoffrey A. Ozin. "Bio-Inspired Nanocomposites: From Synthesis Toward Potential Applications." MRS Proceedings 707 (2001). http://dx.doi.org/10.1557/proc-707-aa5.5.1/hh5.5.1.

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ABSTRACTIn recent years, the extraordinary properties of bio-inspired nanocomposites have stimulated great interest in the development of bottom-up synthetic approaches to organic-inorganic hybrid materials in which molecular scale control is exerted over the interface between the organic and inorganic moieties. These developments have led to advanced materials with novel properties and potential use in catalysis, sensing, separations and environmental remediation. Periodic mesoporous organosilica (PMO) materials are an entirely new class of nanocomposites with molecularly integrated organic/inorganic networks, high surface areas and pore volumes, and well ordered and uniform size pores and channels. We recently have extended the approach to include novel PMO materials incorporating chiral and heteroatom-containing organic functional groups inside the inorganic framework that may be useful in asymmetric catalysis, enantiomeric separations and heavy metal remediation.

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24

Asefa, Tewodros, Neil Coombs, Hiltrud Grondey, Mietek Jaroniec, Michal Kruk, Mark J. MacLachlan, and Geoffrey A. Ozin. "Bio-Inspired Nanocomposites: From Synthesis Toward Potential Applications." MRS Proceedings 711 (2001). http://dx.doi.org/10.1557/proc-711-hh5.5.1/aa5.5.1.

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Анотація:

ABSTRACTIn recent years, the extraordinary properties of bio-inspired nanocomposites have stimulated great interest in the development of bottom-up synthetic approaches to organic-inorganic hybrid materials in which molecular scale control is exerted over the interface between the organic and inorganic moieties. These developments have led to advanced materials with novel properties and potential use in catalysis, sensing, separations and environmental remediation. Periodic mesoporous organosilica (PMO) materials are an entirely new class of nanocomposites with molecularly integrated organic/inorganic networks, high surface areas and pore volumes, and well ordered and uniform size pores and channels. We recently have extended the approach to include novel PMO materials incorporating chiral and heteroatom-containing organic functional groups inside the inorganic framework that may be useful in asymmetric catalysis, enantiomeric separations and heavy metal remediation.

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25

Matsukawa, Hiroki, Masaki Yoshida, Takahiro Tsunenari, Shunsuke Nozawa, Ayana Sato-Tomita, Yoshifumi Maegawa, Shinji Inagaki, Atsushi Kobayashi, and Masako Kato. "Fast and stable vapochromic response induced through nanocrystal formation of a luminescent platinum(II) complex on periodic mesoporous organosilica." Scientific Reports 9, no. 1 (October 22, 2019). http://dx.doi.org/10.1038/s41598-019-51615-w.

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Abstract A hybrid vapoluminescent system exhibiting fast and repeatable response was constructed using periodic mesoporous organosilica with bipyridine moieties (BPy-PMO) and a Pt(II) complex bearing a potentially luminescent 2-phenylpyridinato (ppy) ligand. An intense red luminescence appeared when the Pt(II)-complex immobilised BPy-PMO was exposed to methanol vapour and disappeared on exposure to pyridine vapour. The ON-OFF vapochromic behaviour occurred repeatedly in a methanol/pyridine/heating cycle. Interestingly, a rapid response was achieved in the second cycle and cycles thereafter. Scanning and transmission electron microscopies (SEM/TEM), absorption and emission, and nuclear magnetic resonance spectroscopies, mass spectrometry, and powder X-ray diffraction indicated that methanol vapour induced Si-C cleavage and thus liberated [Pt(ppy)(bpy)]Cl (bpy = 2,2′-bipyridine) from the BPy-PMO framework. Furthermore, the self-assembling properties of the Pt(II) complex resulted in the formation of highly luminescent micro/nanocrystals that were homogeneously dispersed on the porous support. The unique vapoluminescence triggered by the unprecedented protodesilylation on exposure to protic solvent vapour at room temperature is attributable to BPy-PMO being a giant ligand and an effective vapour condenser. Consequently, this hybrid system presents a new strategy for developing sensors using bulk powdery materials.

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