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Synthesis, Characterization, and Non-Covalent Interactions of Palladium(II)-Amino Acid Complexes. Molecules 2021; 26:molecules26144331. [PMID: 34299606 PMCID: PMC8303679 DOI: 10.3390/molecules26144331] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 07/12/2021] [Accepted: 07/13/2021] [Indexed: 11/17/2022] Open
Abstract
The reaction of palladium(II) acetate with acyclic amino acids in acetone/water yields square planar bis-chelated palladium amino acid complexes that exhibit interesting non-covalent interactions. In all cases, complexes were examined by multiple spectroscopic techniques, especially HRMS (high resolution mass spectrometry), IR (infrared spectroscopy), and 1H NMR (nuclear magnetic resonance) spectroscopy. In some cases, suitable crystals for single crystal X-ray diffraction were able to be grown and the molecular structure was obtained. The molecular geometries of the products are discussed. Except for the alanine complex, all complexes incorporate water molecules into the extended lattice and exhibit N-H···O and/or O···(HOH)···O hydrogen bonding interactions. The non-covalent interactions are discussed in terms of the extended lattice structures exhibited by the structures.
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ADACHI K, TSURU N. Morphological Analysis of Self-assembled Structures of Merbromin Molecules Adsorbed on Titanium(IV) Oxide Nanoparticles. BUNSEKI KAGAKU 2018. [DOI: 10.2116/bunsekikagaku.67.719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Kenta ADACHI
- Department of Chemistry, Graduate School of Sciences & Technology for Innovation, Yamaguchi University
- Opto-Energy Research Center, Yamaguchi University
| | - Nodoka TSURU
- Department of Biology and Chemistry, Faculty of Science, Yamaguchi University
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Adachi K, Ura Y, Kanetada N. Stimuli-triggered reversible switching mechanism between H- and J-type supramolecular assemblies of cationic porphyrins adsorbed on tungsten(VI) oxide surface. J PORPHYR PHTHALOCYA 2018. [DOI: 10.1142/s1088424618500372] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Supramolecular organic dye–inorganic semiconductor nanocrystal assemblies are potentially useful in a broad range of technologies and applications, including photovoltaic systems, but the molecular basis of the adsorption of dye molecules onto the semiconductor surfaces remains poorly understood. Herein, we investigated the pH-dependent adsorption and conformational change of two cationic porphyrin stereoisomers [5,10-diphenyl-15,20-di([Formula: see text]-methyl-4-pyridyl)porphyrin (cis-DMPyP) and 5,15-diphenyl-10,20-di([Formula: see text]-methyl-4-pyridyl)porphyrin (trans-DMPyP)] on the tungsten(VI) oxide (WO[Formula: see text] colloid nanoparticle in aqueous media by means of UV-vis absorption spectroscopy. In accordance with the combination of a modified Langmuir adsorption model and Kasha’s exciton coupling model, the molecular orientation and stacking arrangement of DMPyP derivatives on the WO[Formula: see text] colloid surface are discussed in detail. In the trans-DMPyP/WO[Formula: see text] aqueous system, trans-DMPyP molecules adopted flat-on orientation with respect to the WO[Formula: see text] colloid surface and eventually formed head-to-tail [Formula: see text]-dimers regardless of pH conditions. cis-DMPyP molecules in the acidic system also lay flat-on and mainly formed [Formula: see text]-dimers on the WO[Formula: see text] colloid surface, whereas ones in the neutral system exhibited a dominant edge-on orientation and had a higher tendency to form face-to-face [Formula: see text]-dimers. Additionally, we have also convincingly demonstrated the pH-triggered switchable [Formula: see text]-stacking geometry of cis-DMPyP molecules from [Formula: see text]- to [Formula: see text]-dimer and vice versa on the WO[Formula: see text] colloid surface. Such findings will undoubtedly provide a pertinent guideline for the rational design of stimuli-responsive organic-inorganic materials.
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Affiliation(s)
- Kenta Adachi
- Department of Chemistry, Graduate School of Sciences & Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8512, Japan
- Opto-Energy Research Center, Yamaguchi University, Yamaguchi, 753-8511, Japan
| | - Yukimasa Ura
- Department of Chemistry, Graduate School of Sciences & Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8512, Japan
| | - Naoya Kanetada
- Department of Environmental Science & Engineering, Graduate School of Science & Engineering, Yamaguchi University, Yamaguchi, Japan
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Batat P, Bayar M, Pur B, Çoker E, Ahsen V, Yuksel F, Demirel AL. The optical characterization of metal-mediated aggregation behaviour of amphiphilic Zn(ii) phthalocyanines. Phys Chem Chem Phys 2016; 18:15574-83. [DOI: 10.1039/c6cp01093h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Addition of Ag+ cations induces J-aggregation in ultrathin films of both symmetrically and asymmetrically substituted Zn(ii) phthalocyanines.
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Affiliation(s)
- P. Batat
- Chemistry Department
- Koç University
- İstanbul
- Turkey
| | - M. Bayar
- Chemistry Department
- Gebze Technical University
- Kocaeli
- Turkey
| | - B. Pur
- Chemistry Department
- Gebze Technical University
- Kocaeli
- Turkey
| | - E. Çoker
- Chemistry Department
- Koç University
- İstanbul
- Turkey
| | - V. Ahsen
- Chemistry Department
- Gebze Technical University
- Kocaeli
- Turkey
| | - F. Yuksel
- Chemistry Department
- Gebze Technical University
- Kocaeli
- Turkey
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Tolbin AY, Pushkarev VE, Balashova IO, Dzuban AV, Tarakanov PA, Trashin SA, Tomilova LG, Zefirov NS. A highly stable double-coordinated 2-hydroxy-tri(tert-butyl)-substituted zinc phthalocyanine dimer: synthesis, spectral study, thermal stability and electrochemical properties. NEW J CHEM 2014. [DOI: 10.1039/c4nj00692e] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photophysical properties of the thermally and chemically stable J-type phthalocyanine dimer were studied for the first time.
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Affiliation(s)
- Alexander Yu. Tolbin
- Institute of Physiologically Active Compounds
- Russian Academy of Sciences
- Moscow Region, Russian Federation
| | - Victor E. Pushkarev
- Institute of Physiologically Active Compounds
- Russian Academy of Sciences
- Moscow Region, Russian Federation
| | - Irina O. Balashova
- Institute of Physiologically Active Compounds
- Russian Academy of Sciences
- Moscow Region, Russian Federation
| | - Alexander V. Dzuban
- Department of Chemistry M. V. Lomonosov Moscow State University
- 119991 Moscow, Russian Federation
| | - Pavel A. Tarakanov
- Institute of Physiologically Active Compounds
- Russian Academy of Sciences
- Moscow Region, Russian Federation
| | - Stanislav A. Trashin
- Institute of Physiologically Active Compounds
- Russian Academy of Sciences
- Moscow Region, Russian Federation
| | - Larisa G. Tomilova
- Institute of Physiologically Active Compounds
- Russian Academy of Sciences
- Moscow Region, Russian Federation
- Department of Chemistry M. V. Lomonosov Moscow State University
- 119991 Moscow, Russian Federation
| | - Nikolay S. Zefirov
- Institute of Physiologically Active Compounds
- Russian Academy of Sciences
- Moscow Region, Russian Federation
- Department of Chemistry M. V. Lomonosov Moscow State University
- 119991 Moscow, Russian Federation
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Li H, Fan J, Peng X. Colourimetric and fluorescent probes for the optical detection of palladium ions. Chem Soc Rev 2013; 42:7943-62. [PMID: 23845987 DOI: 10.1039/c3cs60123d] [Citation(s) in RCA: 173] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In recent years, the development of optical probes to analyse trace palladium ions (Pd(2+)) has attracted great attention because of the residual palladium released by catalytic converters or from various Pd-catalysed reactions. These residual palladium ions may cause potential health hazards. This review provides a brief introduction to the new methods used to determine trace amounts of Pd(2+), which then mainly focuses on the different reporting systems and unique mechanisms of the colourimetric and fluorescent probes used to detect Pd(2+), including Pd(2+) complex formation or Pd-catalysed reactions.
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Affiliation(s)
- Honglin Li
- State Key Laboratory of Fine Chemicals, Faculty of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China.
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Yi J, Chen Z, Xiang J, Zhang F. Photocontrollable J-aggregation of a diarylethene-phthalocyanine hybrid and its aggregation-stabilized photochromic behavior. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:8061-8066. [PMID: 21667954 DOI: 10.1021/la201197k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The photocontrollable J-aggregation of a diarylethene-phthalocyanine hybrid (T-ZnPc) and its aggregation-stabilized photochromic behavior were investigated by various techniques. T-ZnPc initially exhibited slight J-aggregation tendency in solvents such as chloroform and toluene through conformational planarization effect, but formed much stronger J-aggregates upon the illumination of 254 nm UV light. In darkness, the UV-irradiated solutions gradually returned to their initial state. These phenomena can be explained by the pronounced change in molecular planarity accompanying the reversible isomerization of the diarylethene units of T-ZnPc. Besides, we have found that the thermal stability of the closed-ring diarylethene isomers in molecularly dispersed T-ZnPc is much poorer than that in aggregates. As long as the aggregates were broken, they converted to corresponding open-ring form instantly. This study provided an example of fully photocontrollable aggregation of phthalocyanines and paved a new way for improving the stability of the photochromic systems.
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Affiliation(s)
- Jiaxiang Yi
- The Key Lab of Organic Photoelectrons & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, PR China
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Chen Z, Niu L, Cheng Y, Zhou X, Zhong C, Zhang F. Octathienyl/phenyl-substituted zinc phthalocyanines J-aggregated through conformational planarization. Dalton Trans 2011; 40:393-401. [DOI: 10.1039/c0dt01066a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Watarai H, Adachi K. Measuring the optical chirality of molecular aggregates at liquid-liquid interfaces. Anal Bioanal Chem 2010; 395:1033-46. [PMID: 19727689 DOI: 10.1007/s00216-009-3012-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2009] [Revised: 07/20/2009] [Accepted: 07/24/2009] [Indexed: 12/01/2022]
Abstract
Some new experimental methods for measuring the optical chirality of molecular aggregates formed at liquid-liquid interfaces have been reviewed. Chirality measurements of interfacial aggregates are highly important not only in analytical spectroscopy but also in biochemistry and surface nanochemistry. Among these methods, a centrifugal liquid membrane method was shown to be a highly versatile method for measuring the optical chirality of the liquid-liquid interface when used in combination with a commercially available circular dichroism (CD) spectropolarimeter, provided that the interfacial aggregate exhibited a large molar absorptivity. Therefore, porphyrin and phthalocyanine were used as chromophoric probes of the chirality of itself or guest molecules at the interface. A microscopic CD method was also demonstrated for the measurement of a small region of a film or a sheet sample. In addition, second-harmonic generation and Raman scattering methods were reviewed as promising methods for detecting interfacial optical molecules and measuring bond distortions of chiral molecules, respectively.
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Affiliation(s)
- Hitoshi Watarai
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
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Adachi K, Mita T, Yamate T, Yamazaki S, Takechi H, Watarai H. Controllable adsorption and ideal H-aggregation behaviors of phenothiazine dyes on the tungsten oxide nanocolloid surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:117-125. [PMID: 19694464 DOI: 10.1021/la902174s] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The monomer-aggregate equilibrium of four phenothiazine (PN) dyes, containing thionine (TH), methylene blue (MB), new methylene blue (NMB), and 1,9-dimethylmethylene blue (DMB), in the tungsten(VI) oxide (WO(3)) nanocolloid solution has been investigated by means of UV-vis spectroscopy. Addition of PN dye into the WO(3) nanocolloid solution brought about significant changes in the absorption spectrum, suggesting the formation of H-type (face-to-face fashion) trimer on the WO(3) nanocolloid surface. The adsorptivity of PN dyes onto the WO(3) nanocolloid surface was diminished by the raising the ionic strength, indicating the evidence of the electrostatic interaction between cationic PN dye and negatively charged WO(3) nanocolloids. The detail analysis of each spectral data provided insight into the effect of molecular structure of PN dyes on the adsorption and aggregation behaviors on the WO(3) nanocolloid surface. Moreover, in situ measurement of PN dye aggregation using the centrifugal liquid membrane (CLM) technique revealed that the aggregation of PN dyes on the WO(3) nanocolloid surface proceeded in a two-step three-stage (monomer --> dimer --> trimer) formation. The aggregation mechanism of PN dyes on the WO(3) nanocolloid surface was discussed on the basis of Kasha's exciton theory.
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Affiliation(s)
- Kenta Adachi
- Department of Environmental Science & Engineering, Graduate School of Science & Engineering, Yamaguchi University, Yamaguchi 753-8512, Japan.
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Nyokong T. Electronic Spectral and Electrochemical Behavior of Near Infrared Absorbing Metallophthalocyanines. FUNCTIONAL PHTHALOCYANINE MOLECULAR MATERIALS 2010. [DOI: 10.1007/978-3-642-04752-7_2] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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12
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Niu L, Zhong C, Chen Z, Zhang Z, Li Z, Zhang F, Tang Y. Novel azobenzene-phthalocyanine dyads――design of photo-modulated J-aggregation. Sci Bull (Beijing) 2009. [DOI: 10.1007/s11434-009-0099-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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13
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Watarai H, Oyama H. In Situ Measurements of Aggregation and Disaggregation of Cu(II) Complex at Liquid/Liquid Interface. Anal Chem 2008; 80:8348-52. [DOI: 10.1021/ac8008719] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hitoshi Watarai
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka 560-0043, Osaka, Japan
| | - Hiroko Oyama
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka 560-0043, Osaka, Japan
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Chen Z, Zhong C, Zhang Z, Li Z, Niu L, Bin Y, Zhang F. Photoresponsive J-aggregation behavior of a novel azobenzene-phthalocyanine dyad and its third-order optical nonlinearity. J Phys Chem B 2008; 112:7387-94. [PMID: 18512976 DOI: 10.1021/jp710461p] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The photoresponsive J-aggregation behaviors of a novel azobenzene-substituted zinc phthalocyanine (azo-ZnPc dyad) were studied by UV/vis, fluorescence, and (1)H NMR spectroscopy. Upon illumination with 365 nm UV light, the trans-cis isomerization of azobenzene can efficiently reduce the steric hindrance around the peripheral oxygen atom of azo-ZnPc, shortening the possible distance between two phthalocyanine molecules and, consequently, greatly improving the tendency of J-aggregation of azo-ZnPc dyad. The third-order optical nonlinearities of the photoresponsive J-aggregates (before and after illumination) were measured by a Z-scan technique at 532 nm with a pulse duration of 25 ps. The Z-scan spectra revealed that all the samples possessed large positive nonlinear refraction and positive nonlinear absorption, exhibiting a self-focusing effect and reverse saturable absorption, respectively. The second molecular hyperpolarizabilities of the dyad in two conditions were measured to be 3.87 x 10(-30) and 4.82 x 10(-30) esu, respectively. All the results suggest that the azo-ZnPc dyad has potential in the field of nonlinear optics applications.
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Affiliation(s)
- Zihui Chen
- The Key Lab of Organic Photoelectrons & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
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15
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Synthesis and solvent effects on the electronic absorption and fluorescence spectral properties of substituted zinc phthalocyanines. Polyhedron 2007. [DOI: 10.1016/j.poly.2007.01.018] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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16
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He X, Li Q, Li Y, Wang N, Song Y, Liu X, Yuan M, Xu W, Liu H, Wang S, Shuai Z, Zhu D. Spontaneously Aggregated Chiral Nanostructures from Achiral Tripod−Terpyridine. J Phys Chem B 2007; 111:8063-8. [PMID: 17585797 DOI: 10.1021/jp071706j] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A chiral tripod-terpyridine ligand is known to coordinate with Ag+. These complexes self-assemble into chiral aggregates at room temperature. Molecular dynamic simulation reveals the cooperation of tripodal ligand structures with Ag(I) cations, which leads to the formation of helical aggregations, thus the chirality.
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Affiliation(s)
- Xiaorong He
- Beijing National Laboratory for Molecular Science (BNLMS), CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
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Huang X, Zhao F, Li Z, Tang Y, Zhang F, Tung CH. Self-assembled nanowire networks of aryloxy zinc phthalocyanines based on Zn-O coordination. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:5167-72. [PMID: 17375938 DOI: 10.1021/la062326c] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Tetrakis(aryloxy)phthalocyanine (4c) and its Zn congeners (4a and 4b) and Ni congener (4d) were synthesized, and their self-assembling properties in coordinating and non-coordinating solvents were investigated by absorption and fluorescence spectroscopy, matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS), and transmission electron microscopy (TEM). Compounds 4a and 4b in non-coordinating solvents exhibit red-shifted and split Q-bands in absorption spectra even at very low concentrations, suggesting J-aggregate formation. The MALDI-TOF MS for the samples of 4a and 4b prepared from chloroform solutions gives the monomer and aggregate signals. The TEM images of such samples display an indefinite two-dimensional network structure. The aggregates break up into monomers when a coordinating solvent is added to the solution. The driving force for the aggregate formation is proposed to be the complementary coordination of the ether oxygen in the aryloxy groups of one molecule to the core Zn of another molecule of phthalocyanine.
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Affiliation(s)
- Xin Huang
- Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
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Durmuş M, Ahsen V, Nyokong T. Photophysical and photochemical studies of long chain-substituted zinc phthalocyanines. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2006.08.025] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Adachi K, Watarai H. Binding Behavior of Subphthalocyanine-Tagged Testosterone with Human Serum Albumin at then-Hexane/Water Interface. Anal Chem 2006; 78:6840-6. [PMID: 17007504 DOI: 10.1021/ac060720+] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Subphthalocyaninatoboron(III) was applied for the first time as a novel marker-tag of testosterone (Subpc-test) for the binding analysis with human serum albumin (HSA) at a liquid/liquid interface. The binding interaction of Subpc-test with HSA at the n-hexane/water interface was studied by UV-visible absorption and circular dichroism (CD) spectroscopy combined with a centrifugal liquid membrane cell at different pHs of aqueous solutions. Complementary studies by a high-speed stirring experiment and an interfacial tension measurement were also performed to characterize the interfacial adsorptivity of Subpc-test and HSA molecules, respectively. The n-hexane solution of Subpc-test showed no optical chirality, but the contact with the aqueous solution of HSA induced its optical chirality, clearly suggesting the formation of Subpc-test/HSA complexes at the n-hexane/water interface. Furthermore, pH profiles of CD signals showed that the interaction between Subpc-test and HSA was very sensitive to the neutral-to-base transition (N-B transition). Interfacial formation of the Subpc-test/HSA complex was studied in the presence of the site-selective ligand, furosemide (site I) or cefaclor (site II). The experimental results suggested that Subpc-test is bound to site I of the HSA molecule at the n-hexane/water interface. This technique using subphthalocyanine as a tag molecule and the liquid/liquid interface as a two-dimensional nanoreaction field will be useful for the evaluation of the interaction between drugs or hormones and proteins.
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Affiliation(s)
- Kenta Adachi
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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Adachi K, Chayama K, Watarai H. Formation of helical J-aggregate of chiral thioether-derivatized phthalocyanine bound by palladium(II) at the toluene/water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:1630-9. [PMID: 16460084 DOI: 10.1021/la0526131] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
A chiral thioether-substituted phthalocyanine ((2,3,9,10,16,17,23,24-octakis-1-phenylethylthiophthalocyaninato)magnesium(II) [MgPc(SEtPh)8]) has been synthesized, which can be bound by soft-metal ions such as palladium(II) ion. Aggregates formed from MgPc(SEtPh)8 and Pd(II) in toluene and at the toluene/water interface were characterized by means of UV-vis absorption and circular dichroism (CD) spectrometries using centrifugal liquid-membrane (CLM) cell. Matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF/MS) and scanning electron microscope (SEM) were used as complementary techniques. The toluene solution of MgPc(SEtPh)8 had no optical chirality. However, the addition of PdCl2 into the toluene solution of MgPc(SEtPh)8 induced optical chirality, which indicated the formation of a twisted H-type dimer (face-to-face fashion) of MgPc(SEtPh)8 bound by four PdCl2 in the bulk toluene solution. On the other hand, in the toluene/water interface, helical J-aggregate (head-to-tail fashion) of MgPc(SEtPh)8 bound by PdCl2 was formed, in which one J-aggregate unit contained five 1:2 complexes of MgPc(SEtPh)8-Pd(II) on average. On the basis of the experimental results and the exciton theory for optical chirality, a possible mechanism for the chiral aggregation of MgPc(SEtPh)8-Pd(II) complexes at the interface was proposed. In the present study, we demonstrated a novel strategy for the design of helical phthalocyanine aggregates using the liquid/liquid interface as a template.
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Affiliation(s)
- Kenta Adachi
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043, Japan
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Adachi K, Watarai H. Two-phase Couette flow linear dichroism measurement of the shear-forced orientation of a palladium(ii)-induced aggregate of thioether-derivatised subphthalocyanines at the toluene/glycerol interface. NEW J CHEM 2006. [DOI: 10.1039/b517657c] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Tau P, Nyokong T. Synthesis, electrochemical and photophysical properties of phthalocyaninato oxotitanium(iv) complexes tetra-substituted at the ? and ? positions with arylthio groups. Dalton Trans 2006:4482-90. [PMID: 16981023 DOI: 10.1039/b607538j] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis, electrochemical and photophysical properties of the following tetra-substituted thiol oxotitanium phthalocyanines are reported for the first time: 1,(4)-(tetraphenylthiophthalocyaninato)titanium(IV)oxide (); 1,(4)-(tetrabenzylthiophthalocyaninato)titanium(IV)oxide (); 2,(3)-(tetraphenylthiophthalocyaninato)titanium(IV)oxide () and 2,(3)-(benzylthiophthalocyaninato)titanium(IV)oxide (). Cyclic voltammograms of all four complexes are similar, with three reversible reduction couples each involving a one electron transfer process. The first two reductions were confirmed by spectroelectrochemistry to be metal-based reductions due to TiIVPc-2/TiIIIPc-2 and TiIIIPc-2/TiIIPc-2 redox processes, while the last reduction was confirmed to be a ring-based reduction due to TiIIPc-2/TiIIPc-3. Low fluorescence quantum yields (0.05-0.14), relatively long triplet lifetimes (150-210 micros) and triplet yields (0.31 to 0.82) were observed.
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Affiliation(s)
- Prudence Tau
- Department of Chemistry, Rhodes University, South Africa
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Adachi K, Chayama K, Watarai H. Control of optically active structure of thioether-phthalocyanine aggregates by chiral Pd(II)-BINAP complexes in toluene and at the toluene/water interface. Chirality 2006; 18:599-608. [PMID: 16715515 DOI: 10.1002/chir.20293] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The Pd(II)-2,2'-bis(diphenylphosphino)-1,1'-binaphthyl (BINAP)-mediated chiral assembly of thioether-derivatised phthalocyanatomagnesium(II) compounds (MgPc(SR)8, SR is benzylthio (SBz) or benzhydrylthio (Bh)) was formed in toluene and at the toluene/water interface, and investigated by means of UV-Vis absorption and circular dichroism (CD) spectroscopy combined with the centrifugal liquid-membrane (CLM) devise. Interfacial tension measurements indicated that, in the presence of PdSO4 in the aqueous phase, BINAP ligand adsorbed as a monolayer forming Pd(II)BINAP2+ complex at the toluene/water interface. UV-Vis absorption spectrum of MgPc(SR)8 in the Q-band region was blue-shifted in toluene upon addition of [Pd(II)BINAP]Cl2, but red-shifted at the toluene/water interface when Pd(II)BINAP2+ was formed at the interface. These results suggested that MgPc(SR)8-Pd(II)BINAP complex formed H-aggregate (face-to-face type) in toluene solution and J-aggregate (end-to-end type) at the toluene/water interface, respectively. Moreover, the specific bisignate CD spectral pattern in both systems indicated that the aggregates of MgPc(SR)8-Pd(II)BINAP complexes were chirally twisted, well controlled by the chirality of BINAP ligand. Very interestingly, the morphology of MgPc(SBz)8-Pd(II)BINAP and MgPc(SBh)8-Pd(II)BINAP aggregates formed at the toluene/water interface were significantly different as the rodlike and the ribbonlike crystalline structure, respectively, as observed by a scanning electron microscopy (SEM). On the basis of these experimental results, we proposed schematic molecular models of the chiral aggregates of MgPc(SR)8-Pd(II)BINAP complexes and demonstrated the specific role of the toluene/water interface.
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Affiliation(s)
- Kenta Adachi
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan
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