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Abstract
Maya blue is an ancient nanostructured pigment. The novelty of our approach is to functionalize geopolymers with a sepiolite-based hybrid organic–inorganic nanocomposite, inspired from Maya blue. The colored cold ceramic is acid- and UV-resistant.
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52
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Zhang Y, Fan L, Zhang J, Wang A. Water-dispersible and stable fluorescent Maya Blue-like pigments. RSC Adv 2015. [DOI: 10.1039/c5ra01863c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Water-dispersible and stable fluorescent Maya Blue-like pigments were prepared via the host–guest interaction between LAPONITE® RD and Pigment Red 31.
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Affiliation(s)
- Yujie Zhang
- Center of Eco-material and Green Chemistry
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- P. R. China
| | - Ling Fan
- Center of Eco-material and Green Chemistry
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- P. R. China
| | - Junping Zhang
- Center of Eco-material and Green Chemistry
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- P. R. China
| | - Aiqin Wang
- Center of Eco-material and Green Chemistry
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- P. R. China
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53
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García-Fernández P, Moreno M, Aramburu JA. Origin of the exotic blue color of copper-containing historical pigments. Inorg Chem 2014; 54:192-9. [PMID: 25515925 DOI: 10.1021/ic502420j] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The study of chemical factors that influence pigment coloring is a field of fundamental interest that is still dominated by many uncertainties. In this Article, we investigate, by means of ab initio calculations, the origin of the unusual bright blue color displayed by historical Egyptian Blue (CaCuSi4O10) and Han Blue (BaCuSi4O10) pigments that is surprisingly not found in other compounds like BaCuSi2O6 or CaCuO2 containing the same CuO4(6-) chromophore. We show that the differences in hue between these systems are controlled by a large red-shift (up to 7100 cm(-1)) produced by an electrostatic field created by a lattice over the CuO4(6-) chromophore from the energy of the 3z(2)-r(2) → x(2)-y(2) transition, a nonlocal phenomenon widely ignored in the realm of transition metal chemistry and strongly dependent upon the crystal structure. Along this line, we demonstrate that, although SiO4(4-) units are not involved in the chromophore itself, the introduction of sand to create CaCuSi4O10 plays a key role in obtaining the characteristic hue of the Egyptian Blue pigment. The results presented here demonstrate the opportunity for tuning the properties of a given chromophore by modifying the structure of the insulating lattice where it is located.
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Affiliation(s)
- Pablo García-Fernández
- Departamento de Ciencias de la Tierra y Física de la Materia Condensada, Universidad de Cantabria , Avenida de los Castros s/n, 39005 Santander, Spain
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54
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Nicole L, Laberty-Robert C, Rozes L, Sanchez C. Hybrid materials science: a promised land for the integrative design of multifunctional materials. NANOSCALE 2014; 6:6267-6292. [PMID: 24866174 DOI: 10.1039/c4nr01788a] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
For more than 5000 years, organic-inorganic composite materials created by men via skill and serendipity have been part of human culture and customs. The concept of "hybrid organic-inorganic" nanocomposites exploded in the second half of the 20th century with the expansion of the so-called "chimie douce" which led to many collaborations between a large set of chemists, physicists and biologists. Consequently, the scientific melting pot of these very different scientific communities created a new pluridisciplinary school of thought. Today, the tremendous effort of basic research performed in the last twenty years allows tailor-made multifunctional hybrid materials with perfect control over composition, structure and shape. Some of these hybrid materials have already entered the industrial market. Many tailor-made multiscale hybrids are increasingly impacting numerous fields of applications: optics, catalysis, energy, environment, nanomedicine, etc. In the present feature article, we emphasize several fundamental and applied aspects of the hybrid materials field: bioreplication, mesostructured thin films, Lego-like chemistry designed hybrid nanocomposites, and advanced hybrid materials for energy. Finally, a few commercial applications of hybrid materials will be presented.
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Affiliation(s)
- Lionel Nicole
- Sorbonne Universités UPMC Univ Paris 06, UMR 7574, Chimie de la Matière Condensée de Paris, F-75005, Paris, France.
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55
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Mazurenko VV, Valentyuk MV, Stern R, Tsirlin AA. Nonfrustrated interlayer order and its relevance to the Bose-Einstein condensation of magnons in BaCuSi2O6. PHYSICAL REVIEW LETTERS 2014; 112:107202. [PMID: 24679324 DOI: 10.1103/physrevlett.112.107202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Indexed: 06/03/2023]
Abstract
Han purple (BaCuSi2O6) is not only an ancient pigment, but also a valuable model material for studying Bose-Einstein condensation of magnons in high magnetic fields. Using precise low-temperature structural data and extensive density-functional calculations, we elucidate magnetic couplings in this compound. The resulting magnetic model comprises two types of nonequivalent spin dimers, in excellent agreement with the Cu63,65 nuclear magnetic resonance data. We further argue that leading interdimer couplings connect the upper site of one dimer to the bottom site of the contiguous dimer, and not the upper-to-upper and bottom-to-bottom sites, as assumed previously. This finding is verified by inelastic neutron scattering data and implies the lack of frustration between the layers of spin dimers in BaCuSi2O6, thus challenging existing theories of the two-dimensional-like Bose-Einstein condensation of magnons in this compound.
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Affiliation(s)
- Vladimir V Mazurenko
- Theoretical Physics and Applied Mathematics Department, Ural Federal University, 620002 Ekaterinburg, Russia
| | - Maria V Valentyuk
- Theoretical Physics and Applied Mathematics Department, Ural Federal University, 620002 Ekaterinburg, Russia and Institute of Theoretical Physics, University of Hamburg, Jungiusstraße 9, 20355 Hamburg, Germany
| | - Raivo Stern
- National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia
| | - Alexander A Tsirlin
- National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia
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56
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Chen Y, Shang M, Wu X, Feng S. Hydrothermal synthesis, hierarchical structures and properties of blue pigments SrCuSi4O10 and BaCuSi4O10. CrystEngComm 2014. [DOI: 10.1039/c3ce42394h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
In this work, a green chemistry strategy was developed to synthesize blue pigments SrCuSi4O10 and BaCuSi4O10 with good yield and high purity. SrCuSi4O10 and BaCuSi4O10 exhibit hierarchical structures. Our study shows that hydrothermally synthesized BaCuSi2O6 exhibits interesting broad near-infrared luminescence.
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Affiliation(s)
- Yan Chen
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012, PR China
| | - Mingyu Shang
- College of Earth Sciences
- Jilin University
- Changchun 130012, PR China
| | - Xiaofeng Wu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012, PR China
| | - Shouhua Feng
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012, PR China
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57
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Abbott AP. From Test Tube to Turner – the Role of the Chemist in Art. Sci Prog 2013. [DOI: 10.3184/003685013x13818627857152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Most modern art galleries arrange their collections in chronological order and to the average viewer it often the changes in style, fashion or subject matter that is indicative of the passage of time. Far less noted, although possibly more obvious is the change in paint which occurred. Ultimately it is the evolution of chemical techniques that is responsible for these developments. In this article, the major changes in chemical techniques and elemental discovery will be mapped onto the subsequent development of pigments and their use in artworks.
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58
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Borisov SM, Würth C, Resch-Genger U, Klimant I. New life of ancient pigments: application in high-performance optical sensing materials. Anal Chem 2013; 85:9371-7. [PMID: 24000975 DOI: 10.1021/ac402275g] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Calcium, strontium, and barium copper silicates are demonstrated to possess valuable photophysical properties which make them particularly attractive for application in optical chemosensors. Several examples of sensing materials based on these phosphors are provided. Particularly, broad excitation and near-infrared emission makes them ideal candidates for the preparation of ratiometric sensors based on absorption-based indicators. Due to their excellent chemical and photochemical stability and high brightness, these phosphors can serve as reference for fluorescent indicators to enable ratiometric intensity or dually lifetime referenced measurements. Finally, the moderate temperature dependence of the luminescence decay time enables intrinsic temperature compensation of the sensing materials at ambient temperatures. The improved sensitivity at temperatures above 100 °C makes these new materials promising candidates for high-temperature thermographic phosphors.
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Affiliation(s)
- Sergey M Borisov
- Institute of Analytical Chemistry and Food Chemistry, Graz University of Technology , Stremayrgasse 9, 8010, Graz, Austria
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59
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Hamerton I, Tedaldi L, Eastaugh N. A systematic examination of colour development in synthetic ultramarine according to historical methods. PLoS One 2013; 8:e50364. [PMID: 23418413 PMCID: PMC3572120 DOI: 10.1371/journal.pone.0050364] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Accepted: 10/24/2012] [Indexed: 11/23/2022] Open
Abstract
A number of historical texts are investigated to ascertain the optimum conditions for the preparation of synthetic ultramarine, using preparative methods that would have been available to alchemists and colour chemists of the nineteenth century. The effect of varying the proportion of sulphur in the starting material on the colour of the final product is investigated. The optimum preparation involves heating a homogenised, pelletised mixture of kaolin (100 parts), sodium carbonate (100 parts), bitumen emulsion (or any ‘sticky’ carbon source) (12 parts) and sulphur (60 parts) at 750°C for ca. 4 hours. At this stage the ingress of air should be limited. The sample is allowed to cool in the furnace to 500°C, the ingress of air is permitted and additional sulphur (30 parts) is introduced before a second calcination step is undertaken at 500°C for two hours. The products obtained from the optimum synthesis have CIE ranges of x = 0.2945-0.3125, y = 0.2219–0.2617, Y = 0.4257−0.4836, L* = 3.8455–4.3682, a* = 4.2763–7.6943, b* = −7.6772–(−)3.3033, L = 3.8455–4.3682, C = 5.3964–10.8693, h = 315.0636–322.2562. The values are calculated using UV/visible near infrared spectra using Lazurite [1], under D65 illumination, and the 1931 2° observer.
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Affiliation(s)
- Ian Hamerton
- Department of Chemistry, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey, United Kingdom.
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60
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Johnson-McDaniel D, Barrett CA, Sharafi A, Salguero TT. Nanoscience of an ancient pigment. J Am Chem Soc 2013; 135:1677-9. [PMID: 23215240 DOI: 10.1021/ja310587c] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We describe monolayer nanosheets of calcium copper tetrasilicate, CaCuSi(4)O(10), which have strong near-IR luminescence and are amenable to solution processing methods. The facile exfoliation of bulk CaCuSi(4)O(10) into nanosheets is especially surprising in view of the long history of this material as the colored component of Egyptian blue, a well-known pigment from ancient times.
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61
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Tamilarasan S, Sarma D, Reddy MLP, Natarajan S, Gopalakrishnan J. YGa1−xMnxO3: A novel purple inorganic pigment. RSC Adv 2013. [DOI: 10.1039/c2ra22400c] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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62
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Marey Mahmoud HH. Microanalysis of blue pigments from the Ptolemaic temple of Hathor (Thebes), Upper Egypt: a case study. SURF INTERFACE ANAL 2012. [DOI: 10.1002/sia.4999] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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63
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Berrie BH. Rethinking the history of artists' pigments through chemical analysis. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2012; 5:441-459. [PMID: 22708904 DOI: 10.1146/annurev-anchem-062011-143039] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Following a brief overview of the history of analysis of artists' pigments, I discuss the illustrative example of lead-tin yellow. Recent advances in our knowledge of artists' use of red lakes, glassy pigments, and metallic pigments in works of cultural heritage, particularly European paintings, as determined from chemical analyses are described.
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Affiliation(s)
- Barbara H Berrie
- Scientific Research Department, National Gallery of Art, Washington, D.C. 20565, USA.
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64
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Advanced Materials and New Applications of Sepiolite and Palygorskite. DEVELOPMENTS IN CLAY SCIENCE 2011. [DOI: 10.1016/b978-0-444-53607-5.00017-7] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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65
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Dejoie C, Martinetto P, Dooryhée E, Van Elslande E, Blanc S, Bordat P, Brown R, Porcher F, Anne M. Association of indigo with zeolites for improved color stabilization. APPLIED SPECTROSCOPY 2010; 64:1131-1138. [PMID: 20925983 DOI: 10.1366/000370210792973622] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The durability of an organic color and its resistance against external chemical agents and exposure to light can be significantly enhanced by hybridizing the natural dye with a mineral. In search for stable natural pigments, the present work focuses on the association of indigo blue with several zeolitic matrices (LTA zeolite, mordenite, MFI zeolite). The manufacturing of the hybrid pigment is tested under varying oxidizing conditions, using Raman and ultraviolet-visible (UV-Vis) spectrometric techniques. Blending indigo with MFI is shown to yield the most stable composite in all of our artificial indigo pigments. In the absence of defects and substituted cations such as aluminum in the framework of the MFI zeolite matrix, we show that matching the pore size with the dimensions of the guest indigo molecule is the key factor. The evidence for the high color stability of indigo@MFI opens a new path for modeling the stability of indigo in various alumino-silicate substrates such as in the historical Maya Blue pigment.
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Affiliation(s)
- Catherine Dejoie
- Institut Néel, UPR 2940, CNRS, 25 avenue des Martyrs, BP 166, F-38042 Grenoble Cedex 9, France
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66
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Rondão R, Seixas de Melo JS, Voss G. Characterization of the excited states of indigo derivatives in their reduced forms. Chemphyschem 2010; 11:1903-8. [PMID: 20401897 DOI: 10.1002/cphc.201000082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A comprehensive characterization of the electronic spectral and photophysical properties of the leuco (reduced) form of several indigo derivatives, including indigo and Tyrian Purple, with di-, tetra-, and hexa-substitution, was obtained in solution. The characterization involves absorption, fluorescence, and triplet-triplet absorption spectra, together with quantitative measurements of quantum yields of fluorescence, phi(F) (0.46-0.04), intersystem crossing, phi(Tau) (0.013-0.034), internal conversion, phi(IC), and the corresponding lifetimes. The position and degree of substitution promote differences in the spectral and photophysical properties displayed by the investigated leuco derivatives. The phi(F) values are about two orders of magnitude higher than those previously obtained for the corresponding keto forms. Also in contrast with the behavior found for the keto forms, the S(1) approximately approximately -->T(1) intersystem crossing is an efficient route for the excited-state deactivation channel. These findings strengthen the fact that, in contrast to keto indigo where the internal conversion dominates the deactivation of the excited-state, with leuco indigo (and derivatives), the excited state deactivation involves competition between internal conversion, triplet state formation, and fluorescence. A time-resolved investigation of one of the compounds in glycerol showed the presence of a photoisomerization process.
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Affiliation(s)
- Raquel Rondão
- Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
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67
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Rondão R, Seixas de Melo JS, Bonifácio VDB, Melo MJ. Dehydroindigo, the forgotten indigo and its contribution to the color of Maya Blue. J Phys Chem A 2010; 114:1699-708. [PMID: 20055403 DOI: 10.1021/jp907718k] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A comprehensive investigation of the electronic spectral and photophysical properties of the oxidized form of indigo, dehydroindigo (DHI), has been carried out in solution at 293 K. It is shown that dehydroindigo readily converts into its neutral keto form, the blue indigo, in a process which depends on the solvent and water content of the medium. DHI was investigated in toluene, in benzene, and in methanol and it was found that both the oxidized and the keto indigo forms are present in solution. In marked contrast to what has been found for keto-indigo, where the internal conversion channel dominates >99% of the excited state deactivation, or with the fully reduced leuco-indigo, where fluorescence, internal conversion, and singlet-to-triplet intersystem crossing coexist, in the case of DHI in toluene and benzene, the dominant excited state deactivation channel involves the triplet state. Triplet state yields (phi(T)) of 70-80%, with negligible fluorescence (< or = 0.01%) are observed in these solvents. In methanol the phi(T) value decreases to approximately 15%, with an increase of the fluorescence quantum yield to 2%, which makes these processes competitive with the S(1) --> S(0) internal conversion deactivation process. The data are experimentally compatible with the existence of a lowest lying singlet excited state of n,pi* origin in toluene and of pi,pi* origin in methanol. A time-resolved investigation in the picosecond time domain suggests that the emission of DHI involves three interconnected species (involving rotational isomerism), with relative contributions depending on the emission wavelength. DFT calculations (B3LYP 6-31G** level) were performed in order to characterize the electronic ground (S(0)) and excited singlet (S(1)) and triplet (T(1)) states of DHI. The HOMO-LUMO transition was found to accompany an n --> pi* transition of the oxygen nonbonding orbitals to the central CC and adjacent C-N bonds. Calculations also revealed that in S(0) the two indole-like moieties deviate from planarity from ca. 20 degrees, whereas in S(1) and T(1) the predicted structure is basically planar; a gradual decrease of the carbon-carbon central bond distance is seen in the order S(0), S(1), T(1). An additional study on the blue pigment Maya Blue was made, and the comparison between the solid-state spectra of indigo, DHI, and Maya Blue suggests that, in line with recent investigations, DHI is present together with indigo in Maya Blue. These results are relevant to the discussion of the involvement of dehydroindigo in the palette of colors of the ancient Maya Blue pigment.
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Affiliation(s)
- Raquel Rondão
- Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
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68
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Schmidt CM, Walton MS, Trentelman K. Characterization of lapis lazuli pigments using a multitechnique analytical approach: implications for identification and geological provenancing. Anal Chem 2010; 81:8513-8. [PMID: 19761220 DOI: 10.1021/ac901436g] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Many of the Raman spectra obtained from areas painted with ultramarine pigments in illuminated manuscript leaves from the 14th century Italian manuscript the Laudario of Sant'Agnese, in the collection of the J. Paul Getty Museum, also contain strong bands not typically associated with this pigment. The source of these features was investigated using a multitechnique analytical approach. Techniques employed include Raman microspectroscopy, scanning electron microscopy with energy-dispersive spectroscopy, electron probe microanalysis, and laser ablation inductively coupled plasma mass spectrometry. The results indicate the presence of diopside (CaMgSi(2)O(6)), a mineral commonly associated with lapis lazuli in nature, and suggest that transition metal dopants in the diopside may be responsible for the Raman features, likely the result of fluorescence with vibronic coupling. The implication of this result with respect to using Raman spectroscopy as a fast, noninvasive, and nondestructive method for determining the geological provenance of natural lapis lazuli pigments used in art is discussed.
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Affiliation(s)
- Catherine M Schmidt
- The Getty Conservation Institute, 1200 Getty Center Drive, Suite 700 Los Angeles, California 90049, USA.
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69
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Raya J, Hirschinger J, Ovarlez S, Giulieri F, Chaze AM, Delamare F. Insertion of indigo molecules in the sepiolite structure as evidenced by 1H–29Si heteronuclear correlation spectroscopy. Phys Chem Chem Phys 2010; 12:14508-14. [DOI: 10.1039/c0cp00834f] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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70
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Ruiz-Hitzky E, Aranda P, Darder M, Rytwo G. Hybrid materials based on clays for environmental and biomedical applications. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm00432d] [Citation(s) in RCA: 263] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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71
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Accorsi G, Verri G, Bolognesi M, Armaroli N, Clementi C, Miliani C, Romani A. The exceptional near-infrared luminescence properties of cuprorivaite (Egyptian blue). Chem Commun (Camb) 2009:3392-4. [PMID: 19503881 DOI: 10.1039/b902563d] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cuprorivaite (CaCuSi(4)O(10), also known as Egyptian blue) exhibits an exceptionally high emission quantum efficiency in the near-infrared region (lambda(max) = 910 nm, Phi(EM) = 10.5%) and a long excited state lifetime (107 mus); these properties make it appealing for several applications in the fields of biomedical analysis, telecommunications and lasers.
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Affiliation(s)
- Gianluca Accorsi
- Molecular Photoscience Group, Istituto ISOF, Consiglio Nazionale delle Ricerche, 40129 Bologna, Italy.
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