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Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences

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https://www.readbyqxmd.com/read/27895263/editorial
#1
EDITORIAL
Dave Garner
No abstract text is available yet for this article.
January 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27895262/gas-adsorption-and-structural-diversity-in-a-family-of-cu-ii-pyridyl-isophthalate-metal-organic-framework-materials
#2
Jamie A Gould, Harprit Singh Athwal, Alexander J Blake, William Lewis, Peter Hubberstey, Neil R Champness, Martin Schröder
A family of Cu(II)-based metal-organic frameworks (MOFs) has been synthesized using three pyridyl-isophthalate ligands, H2L(1) (4'-(pyridin-4-yl)biphenyl-3,5-dicarboxylic acid), H2L(2) (4''-(pyridin-4-yl)-1,1':4',1''-terphenyl-3,5-dicarboxylic acid) and H2L(3) (5-[4-(pyridin-4-yl)naphthalen-1-yl]benzene-1,3-dicarboxylic acid). Although in each case the pyridyl-isophthalate ligands adopt the same pseudo-octahedral [Cu2(O2CR)4N2] paddlewheel coordination modes, the resulting frameworks are structurally diverse, particularly in the case of the complex of Cu(II) with H2L(3), which leads to three distinct supramolecular isomers, each derived from Kagomé and square nets...
January 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27895261/photochemistry-of-framework-supported-m-diimine-co-3x-complexes-in-three-dimensional-lithium-carboxylate-metal-organic-frameworks-monitoring-the-effect-of-framework-cations
#3
Thomas J Reade, Thomas S Murphy, James A Calladine, Raphael Horvath, Ian P Clark, Gregory M Greetham, Michael Towrie, William Lewis, Michael W George, Neil R Champness
The structures and photochemical behaviour of two new metal-organic frameworks (MOFs) are reported. Reaction of Re(2,2'-bipy-5,5'-dicarboxylic acid)(CO)3Cl or Mn(2,2'-bipy-5,5'-dicarboxylic acid)(CO)3Br with LiCl or LiBr, respectively, produces single crystals of {Li2(DMF)2 [(2,2'-bipy-5,5'-dicarboxylate)Re(CO)3Cl]}n ( RELI: ) or {Li2(DMF)2[(2,2'-bipy-5,5'-dicarboxylate)Mn(CO)3Br]}n ( MNLI: ). The structures formed by the two MOFs comprise one-dimensional chains of carboxylate-bridged Li(I) cations that are cross-linked by units of Re(2,2'-bipy-5,5'-dicarboxylate)(CO)3Cl ( RELI: ) or Mn(2,2'-bipy-5,5'- dicarboxylate)(CO)3Br ( MNLI: )...
January 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27895260/coordination-polymers-and-metal-organic-frameworks-materials-by-design
#4
Stuart R Batten, Neil R Champness
No abstract text is available yet for this article.
January 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27895259/arene-guest-selectivity-and-pore-flexibility-in-a-metal-organic-framework-with-semi-fluorinated-channel-walls
#5
Rebecca Smith, Iñigo J Vitórica-Yrezábal, Adrian Hill, Lee Brammer
A metal-organic framework (MOF) with one-dimensional channels of approximately hexagonal cross-section [Ag2(O2CCF2CF2CO2)(TMP)] 1: (TMP =2,3,5,6-tetramethylpyrazine) has been synthesized with MeOH filling the channels in its as-synthesized form as [Ag2(O2CCF2CF2CO2)(TMP)]·n(MeOH) 1-MEOH: (n = 1.625 by X-ray crystallography). The two types of ligand connect columns of Ag(I) centres in an alternating manner, both around the channels and along their length, leading to an alternating arrangement of hydrocarbon (C-H) and fluorocarbon (C-F) groups lining the channel walls, with the former groups projecting further into the channel than the latter...
January 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27895258/x-ray-crystallographic-insights-into-post-synthetic-metalation-products-in-a-metal-organic-framework
#6
Michael T Huxley, Campbell J Coghlan, Witold M Bloch, Alexandre Burgun, Christian J Doonan, Christopher J Sumby
Post-synthetic modification of metal-organic frameworks (MOFs) facilitates a strategic transformation of potentially inert frameworks into functionalized materials, tailoring them for specific applications. In particular, the post-synthetic incorporation of transition-metal complexes within MOFs, a process known as 'metalation', is a particularly promising avenue towards functionalizing MOFs. Herein, we describe the post-synthetic metalation of a microporous MOF with various transition-metal nitrates. The parent framework, 1: , contains free-nitrogen donor chelation sites, which readily coordinate metal complexes in a single-crystal to single-crystal transformation which, remarkably, can be readily monitored by X-ray crystallography...
January 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27895257/the-modulator-driven-polymorphism-of-zr-iv-based-metal-organic-frameworks
#7
Franziska Drache, Volodymyr Bon, Irena Senkovska, Jürgen Getzschmann, Stefan Kaskel
The reaction of ZrCl4 and 2,5-thiophenedicarboxylic acid (H2tdc) in the presence of trifluoroacetic acid (Htfa) as modulator results in the formation of the new metal-organic framework (MOF) named DUT-126 (DUT = Dresden University of Technology). The nature and concentration of modulators are found to be decisive synthetic parameters affecting the topology of the formed product. DUT-126 ( HBR: ) extends the series of polymorphs differing in topology, namely DUT-67 ( REO: ), DUT-68 ( BON: ) and DUT-69 ( BCT: ) to four, where DUT-67 and DUT-68 show the same eight-connected secondary building units as in DUT-126...
January 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27895256/a-sr2-metal-organic-framework-with-high-chemical-stability-synthesis-crystal-structure-and-photoluminescence-property
#8
Yan-Yuan Jia, Xiao-Ting Liu, Wen-He Wang, Li-Zhu Zhang, Ying-Hui Zhang, Xian-He Bu
Metal-organic frameworks (MOFs) are typically built by assembly of metal centres and organic linkers, and have emerged as promising crystalline materials in a variety of fields. However, the stability of MOFs is a key limitation for their practical applications. Herein, we report a novel Sr 2+: -MOF [Sr4(Tdada)2(H2O)3(DMF)2] (denoted as NKU- 105: , NKU = Nankai University; H4Tdada = 5,5'-((thiophene-2,5-dicar bonyl)bis(azanediyl))diisophthalic acid; DMF = N,N-dimethylformamide) featuring an open square channel of about 6 Å along the c-axis...
January 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27895255/flue-gas-and-direct-air-capture-of-co2-by-porous-metal-organic-materials
#9
David G Madden, Hayley S Scott, Amrit Kumar, Kai-Jie Chen, Rana Sanii, Alankriti Bajpai, Matteo Lusi, Teresa Curtin, John J Perry, Michael J Zaworotko
Sequestration of CO2, either from gas mixtures or directly from air (direct air capture), is a technological goal important to large-scale industrial processes such as gas purification and the mitigation of carbon emissions. Previously, we investigated five porous materials, three porous metal-organic materials (MOMs), a benchmark inorganic material, ZEOLITE 13X: and a chemisorbent, TEPA-SBA-15: , for their ability to adsorb CO2 directly from air and from simulated flue-gas. In this contribution, a further 10 physisorbent materials that exhibit strong interactions with CO2 have been evaluated by temperature-programmed desorption for their potential utility in carbon capture applications: four hybrid ultramicroporous materials, SIFSIX-3-CU: , DICRO-3-NI-I: , SIFSIX-2-CU-I: and MOOFOUR-1-NI: ; five microporous MOMs, DMOF-1: , ZIF-8: , MIL-101: , UIO-66: and UIO-66-NH2: ; an ultramicroporous MOM, NI-4-PYC: The performance of these MOMs was found to be negatively impacted by moisture...
January 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27799437/the-preservation-of-archaeological-brain-remains-in-a-human-skeleton
#10
Sonia O'Connor, Howell G M Edwards, Esam M A Ali
The identification of biomass within the cranial cavity of a waterlogged human skeleton inside a fish-tailed wooden coffin from a nineteenth century burial has been confirmed as brain tissue. A comparison is made between the Raman spectra obtained in the current study with those from an Iron Age brain found in an isolated cranium dating from about 500 years BCE, the only other Raman spectroscopy study made of human brain recovered from waterlogged, archaeological excavations. The spectra give some surprisingly detailed information about the state of preservation of brain tissue in both burials, especially when it is realized that, unlike preserved bog bodies, no other soft tissue has survived...
December 13, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27799436/raman-spectroscopic-analysis-of-archaeological-specimens-from-the-wreck-of-hms-swift-1770
#11
Howell G M Edwards, Dolores Elkin, Marta S Maier
Specimens from underwater archaeological excavations have rarely been analysed by Raman spectroscopy probably due to the problems associated with the presence of water and the use of alternative techniques. The discovery of the remains of the Royal Navy warship HMS Swift off the coast of Patagonia, South America, which was wrecked in 1770 while undertaking a survey from its base in the Falkland/Malvinas Islands, has afforded the opportunity for a first-pass Raman spectroscopic study of the contents of several glass jars from a wooden chest, some of which had suffered deterioration of their contents owing to leakage through their stoppers...
December 13, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27799435/raman-spectroscopy-in-art-and-archaeology
#12
Howell G M Edwards, Peter Vandenabeele
No abstract text is available yet for this article.
December 13, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27799434/spectroscopic-characterization-of-sixteenth-century-panel-painting-references-using-raman-surface-enhanced-raman-spectroscopy-and-helium-raman-system-for-in-situ-analysis-of-ibero-american-colonial-paintings
#13
María Angélica García-Bucio, Edgar Casanova-González, José Luis Ruvalcaba-Sil, Elsa Arroyo-Lemus, Alejandro Mitrani-Viggiano
Colonial panel paintings constitute an essential part of Latin-American cultural heritage. Their study is vital for understanding the manufacturing process, including its evolution in history, as well as its authorship, dating and other information significant to art history and conservation purposes. Raman spectroscopy supplies a non-destructive characterization tool, which can be implemented for in situ analysis, via portable equipment. Specific methodologies must be developed, comprising the elaboration of reference panel paintings using techniques and materials similar to those of the analysed period, as well as the determination of the best analysis conditions for different pigments and ground preparations...
December 13, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27799433/organic-dyes-in-illuminated-manuscripts-a-unique-cultural-and-historic-record
#14
Maria João Melo, Paula Nabais, Maria Guimarães, Rita Araújo, Rita Castro, Maria Conceição Oliveira, Isabella Whitworth
In this study, we successfully addressed the challenges posed by the identification of dyes in medieval illuminations. Brazilwood pigment lakes and orcein purple colours were unequivocally identified in illuminated manuscripts dated by art historians to be from the thirteenth to the fifteenth centuries and in the Fernão Vaz Dourado Atlas (sixteenth century). All three works were on a parchment support. This was possible by combining Raman microscopy and surface-enhanced Raman spectroscopy with microspectrofluorimetry...
December 13, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27799432/determination-of-thickness-of-thin-turbid-painted-over-layers-using-micro-scale-spatially-offset-raman-spectroscopy
#15
Claudia Conti, Marco Realini, Chiara Colombo, Alessandra Botteon, Moira Bertasa, Jana Striova, Marco Barucci, Pavel Matousek
We present a method for estimating the thickness of thin turbid layers using defocusing micro-spatially offset Raman spectroscopy (micro-SORS). The approach, applicable to highly turbid systems, enables one to predict depths in excess of those accessible with conventional Raman microscopy. The technique can be used, for example, to establish the paint layer thickness on cultural heritage objects, such as panel canvases, mural paintings, painted statues and decorated objects. Other applications include analysis in polymer, biological and biomedical disciplines, catalytic and forensics sciences where highly turbid overlayers are often present and where invasive probing may not be possible or is undesirable...
December 13, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27799431/virtuous-colours-for-mary-identification-of-lapis-lazuli-smalt-and-cochineal-in-the-andean-colonial-image-of-our-lady-of-copacabana-bolivia
#16
Eugenia P Tomasini, Fernando Marte, Valeria P Careaga, Carlos Rúa Landa, Gabriela Siracusano, Marta S Maier
The image of Our Lady of Copacabana, a gilded polychrome sculpture carved in maguey wood in 1583, is one of the most important devotions in the Americas. In former research, we have identified the use of gypsum, Armenian bole, cerussite and atacamite in its polychromy. In this study, a red sample taken from the Virgin's tunic and a blue sample extracted from the cloak have been analysed with the aim to identify both pigments and offer insights into the painting technique. Analysis by micro-Raman spectroscopy complemented with scanning electron microscopy-energy dispersive spectroscopy and high-performance liquid chromatography allowed the identification of carmine lake in the red sample...
December 13, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27799430/study-of-corrosion-in-archaeological-gilded-irons-by-raman-imaging-and-a-coupled-scanning-electron-microscope-raman-system
#17
Marco Veneranda, Ilaria Costantini, Silvia Fdez-Ortiz de Vallejuelo, Laura Garcia, Iñaki García, Kepa Castro, Agustín Azkarate, Juan Manuel Madariaga
In this work, analytical and chemical imaging tools have been applied to the study of a gilded spur found in the medieval necropolis of Erenozar (Bizkaia, Spain). As a first step, a lot of portable equipment has been used to study the object in a non-invasive way. The hand-held energy-dispersive X-ray fluorescence equipment allowed us to characterize the artefact as a rare example of an iron matrix item decorated by means of a fire gilding technique. On the other hand, the use of a portable Raman system helped us to detect the main degradation compounds affecting the spur...
December 13, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27799429/cdsxse1-x-quantum-dots-as-colouring-agents-of-art-nouveau-and-contemporary-stained-glass-a-combined-transmission-electron-microscopy-and-raman-study
#18
C Fornacelli, Ph Sciau, Ph Colomban
The use of cadmium chalchogenide nanoprecipitates to obtain brightly coloured glasses enormously expanded by the beginning of the twentieth century, when the production of cadmium-based pigments was already well established. Six historical stained glass pieces produced between the late 1920s and modern days have been investigated in order to delineate the average size and the elemental composition of the nanocrystals. As non-invasive conditions are now mandatory when considering objects belonging to cultural heritage, Raman spectroscopy is used to measure the (average) elemental composition of the nanoparticles...
December 13, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27799428/raman-spectroscopic-analysis-of-a-noli-me-tangere-painting
#19
Stephen Hibberts, Howell G M Edwards, Mona Abdel-Ghani, Peter Vandenabeele
The discovery of an oil painting in seriously damaged condition with an important historical and a heterodox detail with possible origins in the late fifteenth century has afforded the opportunity for Raman microscopic analysis prior to its restoration being undertaken. The painting depicts a risen Christ following His crucifixion in a 'noli me tangere' pose with three women in an Italian terrace garden with a stone balustrade overlooking a rural landscape and an undoubted view of late-medieval Florence. The picture has suffered much abuse and is in very poor condition, which is possibly attributable to its controversial portrayal of a polydactylic Christ with six toes on His right foot...
December 13, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27799427/pigment-analysis-by-raman-microscopy-and-portable-x-ray-fluorescence-pxrf-of-thirteenth-to-fourteenth-century-illuminations-and-cuttings-from-bologna
#20
Tracey D Chaplin, Robin J H Clark, Richard Jones, Robert Gibbs
Non-destructive pigment analysis by Raman microscopy (RM) and portable X-ray fluorescence (pXRF) has been carried out on some Bolognese illuminations and cuttings chosen to represent the beginnings, evolution and height of Bolognese illuminated manuscript production. Dating to the thirteenth and fourteenth centuries and held in a private collection, the study provides evidence for the pigments generally used in this period. The results, which are compared with those obtained for other north Italian artwork, show the developments in usage of artistic materials and technique...
December 13, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
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