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Croce G, Frache A, Milanesio M, Marchese L, Causà M, Viterbo D, Barbaglia A, Bolis V, Bavestrello G, Cerrano C, Benatti U, Pozzolini M, Giovine M, Amenitsch H. Structural characterization of siliceous spicules from marine sponges. Biophys J 2004; 86:526-34. [PMID: 14695297 PMCID: PMC1303821 DOI: 10.1016/s0006-3495(04)74131-4] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Siliceous sponges, one of the few animal groups involved in a biosilicification process, deposit hydrated silica in discrete skeletal elements called spicules. A multidisciplinary analysis of the structural features of the protein axial filaments inside the spicules of a number of marine sponges, belonging to two different classes (Demospongiae and Hexactinellida), is presented, together with a preliminary analysis of the biosilicification process. The study was carried out by a unique combination of techniques: fiber diffraction using synchrotron radiation, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential scanning calorimetric (DSC), Fourier transform infrared spectroscopy (FTIR), and molecular modeling. From a phylogenetic point of view, the main result is the structural difference between the dimension and packing of the protein units in the spicule filaments of the Demospongiae and the Hexactinellida species. Models of the protein organization in the spicule axial filaments, consistent with the various experimental evidences, are given. The three different species of demosponges analyzed have similar general structural features, but they differ in the degree of order. The structural information on the spicule axial filaments can help shed some light on the still unknown molecular mechanisms controlling biosilicification.
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Albertino A, Garino C, Ghiani S, Gobetto R, Nervi C, Salassa L, Rosenberg E, Sharmin A, Viscardi G, Buscaino R, Croce G, Milanesio M. Photophysical properties and computational investigations of tricarbonylrhenium(I)[2-(4-methylpyridin-2-yl)benzo[d]-X-azole]L and tricarbonylrhenium(I)[2-(benzo[d]-X-azol-2-yl)-4-methylquinoline]L derivatives (X=N–CH3, O, or S; L=Cl−, pyridine). J Organomet Chem 2007. [DOI: 10.1016/j.jorganchem.2006.11.004] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Meninno S, Croce G, Lattanzi A. Asymmetric synthesis of trisubstituted tetrahydrothiophenes bearing a quaternary stereocenter via double Michael reaction involving dynamic kinetic resolution. Org Lett 2013; 15:3436-9. [PMID: 23786495 DOI: 10.1021/ol4014975] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The stereoselective synthesis of highly functionalized tetrahydrothiophenes bearing three contiguous stereocenters, one of them quaternary, can be achieved by reacting trans-α-cyano-α,β-unsaturated ketones and trans-tert-butyl 4-mercapto-2-butenoate in the presence of a readily available amine thiourea. The products are obtained in high yield, good diastereoselectivity, and excellent enantioselectivity. The overall formation of tetrahydrothiophenes occurs via a cascade double Michael reaction involving a highly efficient process of dynamic kinetic resolution.
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Boccaleri E, Carniato F, Croce G, Viterbo D, van Beek W, Emerich H, Milanesio M. In situsimultaneous Raman/high-resolution X-ray powder diffraction study of transformations occurring in materials at non-ambient conditions. J Appl Crystallogr 2007. [DOI: 10.1107/s0021889807025113] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Materials containing disordered moieties and/or amorphous or liquid-like phases or showing surface- or defect-related phenomena constitute a problem with respect to their characterization using X-ray powder diffraction (XRPD), and in many cases Raman spectroscopy can provide useful complementary information. A novel experimental setup has been designed and realized for simultaneousin situRaman/high-resolution XRPD experiments, to take full advantage of the complementarities of the two techniques in investigating solid-state transformations under non-ambient conditions. The added value of the proposed experiment is the perfect synchronization of the two probes with the reaction coordinate and the elimination of possible bias caused by different sample holders and conditioning modes used in `in situbut separate' approaches. The setup was tested on three solid-state transformations: (i) the kinetics of the fluorene–TCNQ solid-state synthesis, (ii) the thermal swelling and degradation of stearate–hydrotalcite, and (iii) the photoinduced (2 + 2)-cyclization of (E)-furylidenoxindole. These experiments demonstrated that, even though the simultaneous Raman/XRPD experiment is more challenging than separate procedures, high-resolution XRPD and Raman data can be collected. A gas blower allows studies from room temperature to 700 K, and 100 K can be reached using a nitrogen cryostream. The flexibility of the experimental setup allows the addition of ancillary devices, such as a UV lamp used to study photoreactivity.
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De Fusco C, Fuoco T, Croce G, Lattanzi A. Noncovalent organocatalytic synthesis of enantioenriched terminal aziridines with a quaternary stereogenic center. Org Lett 2012; 14:4078-81. [PMID: 22857601 DOI: 10.1021/ol3017066] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A high-yielding and enantioselective access to novel N-Boc terminal aziridines, bearing a quaternary stereogenic center, has been developed via an aza-Michael initiated ring-closure (aza-MIRC) reaction of α-acyl acrylates with an N-tosyloxy tert-butyl carbamate catalyzed by a chiral amino thiourea. The feasibility of the aziridine regioselective ring-opening to valuable α,α-disubstituted α-amino acid esters has been demonstrated.
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Saracco G, Ciancio A, Olivero A, Smedile A, Roffi L, Croce G, Colletta C, Cariti G, Andreoni M, Biglino A, Calleri G, Maggi G, Tappero GF, Orsi PG, Terreni N, Macor A, Di Napoli A, Rinaldi E, Ciccone G, Rizzetto M. A randomized 4-arm multicenter study of interferon alfa-2b plus ribavirin in the treatment of patients with chronic hepatitis C not responding to interferon alone. Hepatology 2001; 34:133-8. [PMID: 11431744 DOI: 10.1053/jhep.2001.25636] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Abstract
To determine whether a higher dosage of interferon (IFN) associated with ribavirin and/or prolonged time of administration may improve therapeutic efficacy, we conducted a 4-arm randomized trial on patients with chronic hepatitis C not responding to one or more previous treatment courses with IFN monotherapy. Group 1 (n = 139) received 3 million units (MU) IFN-alpha2b 3 times a week (t.i.w.) plus ribavirin 1,000 mg/d for 12 months; group 2 (n = 162) received 5 MU t.i.w. plus ribavirin for 12 months; group 3 (n = 142) received 3 MU t.i.w. plus ribavirin for 6 months; and group 4 (n = 151) received 5 MU t.i.w. plus ribavirin for 6 months. The primary end point was hepatitis C virus (HCV)-RNA clearance at the end of 6-month follow-up. HCV-RNA was negative in 15% of group 1, 23% of group 2, 11% of group 3, 16% of group 4 (group 2 vs. group 3, P =.04). Among patients with genotypes 1 and 4, sustained response was significantly higher in group 2 vs. group 3 (18% vs. 7%, P =.03; group 1 = 9%, group 4 = 12%, P = not significant [NS]). In patients with genotypes 2 and 3, sustained virologic response was not affected by the different regimens (group 1 = 32%, group 2 = 30%, group 3 = 30%, group 4 = 35%, P = NS). In conclusion, about 23% of nonresponders to IFN monotherapy may achieve a sustained response if re-treated by 5 MU t.i.w. IFN plus ribavirin 1,000 mg/d for 1 year. Patients with genotype 1 should receive a high dosage of IFN plus ribavirin for 12 months, whereas therapy for patients with genotype 2 or 3 should be less aggressive.
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Clinical Trial |
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Petronzi C, Collarile S, Croce G, Filosa R, De Caprariis P, Peduto A, Palombi L, Intintoli V, Di Mola A, Massa A. Synthesis and Reactivity of the 3-Substituted Isoindolinone Framework to Assemble Highly Functionalized Related Structures. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200678] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Conterosito E, Croce G, Palin L, Pagano C, Perioli L, Viterbo D, Boccaleri E, Paul G, Milanesio M. Structural characterization and thermal and chemical stability of bioactive molecule–hydrotalcite (LDH) nanocomposites. Phys Chem Chem Phys 2013; 15:13418-33. [DOI: 10.1039/c3cp51235e] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Russo A, Galdi G, Croce G, Lattanzi A. Highly Enantioselective Epoxidation Catalyzed by Cinchona Thioureas: Synthesis of Functionalized Terminal Epoxides Bearing a Quaternary Stereogenic Center. Chemistry 2012; 18:6152-7. [DOI: 10.1002/chem.201200500] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Indexed: 11/06/2022]
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Shaabani B, Mirtamizdoust B, Viterbo D, Croce G, Hammud H, Hojati-Lalemi P, Khandar A. Sonochemical Synthesis of a Novel Nanoscale Lead(II) Coordination Polymer: Synthesis, Crystal Structure, Thermal Properties, and DFT Calculations of [Pb(dmp)(μ-N3)(μ-NO3)]n with the Novel Pb2(μ-N3)2(μ-NO3)2 Unit. Z Anorg Allg Chem 2011. [DOI: 10.1002/zaac.201000426] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Gobetto R, Nervi C, Romanin B, Salassa L, Milanesio M, Croce G. X-ray Structures and Complete NMR Assignment by DFT Calculations of [Os(bpy)2(CO)Cl]PF6and [Os(bpy)2(CO)H]PF6Complexes. Organometallics 2003. [DOI: 10.1021/om0303202] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Croce G, Frache A, Milanesio M, Viterbo D, Bavestrello G, Benatti U, Giovine M, Amenitsch H. Fiber diffraction study of spicules from marine sponges. Microsc Res Tech 2004; 62:378-81. [PMID: 14534910 DOI: 10.1002/jemt.10403] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A synchrotron radiation fiber diffraction structural study of the axial filament of siliceous spicules from two species of marine sponges (the Demosponge Geodia cydonium and the Hexactinellid Scolymastra joubini) was carried out. The sharpness of the spots in the diffraction patterns indicated that the protein units in the filament of both samples were highly organized. A possible explanation is that the arrangement of the protein units is similar to that of the pores in highly ordered siliceous mesoporous materials. Nevertheless, the diffraction patterns are quite different for the two types of spicules. The pattern of G. cydonium is consistent with a regular 2D hexagonal lattice of protein units in the direction perpendicular to the spicule axis, with a repeating distance of 5.8 nm; the units are linked to form fibers along the axis. The pattern of S. joubini indicates the presence of two different 2D lattices in which the repeating protein units are inclined by +50 degrees and -50 degrees with respect to the elongation axis; the distance between the units increases to 8.4 nm. This 2D model is consistent with hexagonal packing of spirally oriented cylindrical protein units elongated along the filament axis.
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Research Support, Non-U.S. Gov't |
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Croce G, Carniato F, Milanesio M, Boccaleri E, Paul G, van Beek W, Marchese L. Understanding the physico-chemical properties of polyhedral oligomeric silsesquioxanes: a variable temperature multidisciplinary study. Phys Chem Chem Phys 2009; 11:10087-94. [DOI: 10.1039/b913246e] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kettle SFA, Diana E, Marchese EMC, Boccaleri E, Croce G, Sheng T, Stanghellini PL. The Vibrational Spectra of the Cyanide Ligand Revisited: Double Bridging Cyanides. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000265] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Shaheen F, Badshah A, Gielen M, Croce G, Florke U, Vos DD, Ali S. In vitro assessment of cytotoxicity, anti-inflammatory, antifungal properties and crystal structures of metallacyclic palladium(II) complexes. J Organomet Chem 2010. [DOI: 10.1016/j.jorganchem.2009.10.048] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Croce G, Viterbo D, Milanesio M, Amenitsch H. A mesoporous pattern created by nature in spicules from Thetya aurantium sponge. Biophys J 2006; 92:288-92. [PMID: 17056738 PMCID: PMC1697835 DOI: 10.1529/biophysj.106.094532] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Siliceous or carbonate spicules provide support and defense to marine sponges. The inorganic envelope usually embodies a protein core. Our SAXS study of the siliceous spicules from the demosponge Thetya aurantium proves the very ordered structure assumed by the protein core inside the spicules. Indeed, not only the very sharp diffraction spots already found in previous studies on spicules from different sponges are confirmed, but also the 11 sharp spots in the diffraction pattern recorded after thermal treatment at 250 degrees C can only be interpreted in terms of a natural nanocomposite mesostructure with an hexagonal lattice formed by a three-dimensional periodic arrangement of silica cages in which the protein units act as structure directing agent.
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de Cristofaro R, de Candia E, Croce G, Morosetti R, Landolfi R. Binding of human alpha-thrombin to platelet GpIb: energetics and functional effects. Biochem J 1998; 332 ( Pt 3):643-50. [PMID: 9620865 PMCID: PMC1219523 DOI: 10.1042/bj3320643] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Thrombin interaction with platelet glycocalicin (GC), the 140 kDa extracytoplasmic fragment of the membrane glycoprotein Ib, was investigated by using a solid-phase assay. Thrombin bound to GC-coated polystyrene wells was detected by measuring the hydrolysis of a chromogenic substrate. The monoclonal antibody LJ-Ib10, which specifically binds to the thrombin-binding site of GC, could displace thrombin from immobilized GC, whereas the monoclonal antibody LJ-Ib1, which interacts with the von Willebrand factor-binding domain of GC, did not affect thrombin binding to GC. Competitive inhibition of thrombin binding to immobilized GC was also observed using GC in solution or ligands that bind to the thrombin heparin-binding site, such as heparin and prothrombin fragment 2. Furthermore functional experiments demonstrated that GC binding to thrombin competes with heparin for thrombin inactivation by the antithrombin III-heparin complex as well. Thrombin-GC interaction was also studied as a function of temperature over the range 4-37 degreesC. A large negative heat capacity change (DeltaCp), of -4.14+/-0.8 kJ.mol-1.K-1, was demonstrated to dominate the thermodynamics of thrombin-GC complex-formation. Finally it was demonstrated that GC binding to thrombin can allosterically decrease the enzyme affinity for hirudin via a simultaneous decrease in association rate and increase in the dissociation velocity of the enzyme-inhibitor adduct. Together these observations indicate the GC binding to the heparin-binding domain of thrombin is largely driven by a hydrophobic effect and that such interaction can protect the enzyme from inhibition by the heparin-anti-thrombin III complex.
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Arrais A, Boccaleri E, Croce G, Milanesio M, Orlando R, Diana E. Synthesis, structural and spectroscopic study of the donor–acceptor complexes between fluorene and D2hcyano molecular building blocks. CrystEngComm 2003. [DOI: 10.1039/b308380b] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Croce G, Giglioli N, Bolognani L. Antimicrobial activity in the skin secretions of Bombina variegata pachypus. Toxicon 1973; 11:99-100. [PMID: 4579863 DOI: 10.1016/0041-0101(73)90159-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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52 |
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Garino C, Ghiani S, Gobetto R, Nervi C, Salassa L, Croce G, Milanesio M, Rosenberg E, Ross JBA. Tricarbonylchlororhenium(I) Carboxaldimine Derivatives: Synthesis, Structure, and NMR Characterization ofZ andE Isomers. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600252] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Scorzelli F, Di Mola A, Croce G, Palombi L, Massa A. Organocatalytic asymmetric synthesis of highly functionalized pyrrolizidines via cascade Michael/hemi-aminalization reactions of isoindolinones. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.04.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Cauda V, Fiorilli S, Onida B, Vernè E, Vitale Brovarone C, Viterbo D, Croce G, Milanesio M, Garrone E. SBA-15 ordered mesoporous silica inside a bioactive glass-ceramic scaffold for local drug delivery. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2008; 19:3303-3310. [PMID: 18496735 DOI: 10.1007/s10856-008-3468-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2007] [Accepted: 04/30/2008] [Indexed: 05/26/2023]
Abstract
The paper reports the synthesis of an ordered silica mesostructure of the SBA-15 type inside a macroporous bioactive glass-ceramic scaffold of the type SiO(2)-CaO-K(2)O, to combine the bioactivity of the latter with the release properties of the former, in view of local drug delivery from implants designed for tissue engineering. The standard procedure for SBA-15 synthesis has been modified to minimize the damage to the scaffold caused by the acidic synthesis medium. The composite system has been characterized by means of Scanning Electron Microscopy (coupled with EDS analysis), Small Angle X-Ray Diffraction, Thermogravimetry analysis and Infrared Spectroscopy: the formation of a well ordered hexagonal mesostructure was confirmed. Ibuprofen has been chosen as model drug. The uploading properties have been investigated of the scaffold-mesoporous silica composite as compared with the scaffold as such, and a five-fold increase in the adsorbing properties toward ibuprofen was found, due to the presence of the ordered mesoporous silica. The ibuprofen release to a SBF solution in vitro is complete in 1 day. Retention of bioactivity from the glass-ceramic scaffold after the silica mesostructure incorporation has been observed.
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Milanesio M, Croce G, Viterbo D, Pastore HO, Mascarenhas AJDS, Munsignatti ECDO, Meda L. A Combined High-Resolution X-ray Powder Diffraction, Computational, and XPS Study of the Local Structure of Extra-Framework Copper Ions in Over-Exchanged Cu-MCM22 Zeolite. J Phys Chem A 2008; 112:8403-10. [DOI: 10.1021/jp803619r] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Bernini A, Spiga O, Venditti V, Prischi F, Botta M, Croce G, Tong APL, Wong WT, Niccolai N. The use of a ditopic Gd(III) paramagnetic probe for investigating α-bungarotoxin surface accessibility. J Inorg Biochem 2012; 112:25-31. [DOI: 10.1016/j.jinorgbio.2012.03.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Revised: 03/02/2012] [Accepted: 03/03/2012] [Indexed: 01/06/2023]
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Gianotti V, Favaro G, Bonandini L, Palin L, Croce G, Boccaleri E, Artuso E, van Beek W, Barolo C, Milanesio M. Rationalization of dye uptake on titania slides for dye-sensitized solar cells by a combined chemometric and structural approach. CHEMSUSCHEM 2014; 7:3039-3052. [PMID: 25274506 DOI: 10.1002/cssc.201402194] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Indexed: 06/03/2023]
Abstract
A model photosensitizer (D5) for application in dye-sensitized solar cells has been studied by a combination of XRD, theoretical calculations, and spectroscopic/chemometric methods. The conformational stability and flexibility of D5 and molecular interactions between adjacent molecules were characterized to obtain the driving forces that govern D5 uptake and grafting and to infer the most likely arrangement of the molecules on the surface of TiO2. A spectroscopic/chemometric approach was then used to yield information about the correlations between three variables that govern the uptake itself: D5 concentration, dispersant (chenodeoxycholic acid; CDCA) concentration, and contact time. The obtained regression model shows that large uptakes can be obtained at high D5 concentrations in the presence of CDCA with a long contact time, or in absence of CDCA if the contact time is short, which suggests how dye uptake and photovoltaic device preparation can be optimized.
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