Tokyo Institute of Technology · Materials Science
Professor Yuya Tanaka's research lab specializes in the design and synthesis of functional organometallic and coordination complexes, with a focus on molecular wires, host-guest systems, and photoresponsive materials. The lab explores metal-ligand and metal-metal interactions to engineer materials with tunable electronic, optical, and redox properties, particularly emphasizing platinum(II) and iron/ruthenium complexes. Key research directions include photochromic switching, supramolecular recognition, and single-molecule conductance, leveraging advanced spectroscopic and electrochemical techniques. The work bridges molecular architecture with functional materials for applications in molecular electronics and smart materials.
Figures are computed from collected data and may differ slightly.
A novel molecular tweezers-type complex 1, based on a phosphorescent cationic alkynylplatinum(II) terpyridine building block, has been synthesized and characterized by NMR, mass spectroscopy, elemental analysis and X-ray diffraction study. Host–guest chemistry of the host complex 1 and various guest metal complexes with different ligands, charges and/or metal centres has been investigated. Various metal complexes including the negatively charged platinum complexes can interact with 1 in a 1 : 1
Dinuclear acetylide-type complexes bridged by a photochromic dithienylethene unit (DTE), [Y-C[triple bond]C-DTE-C[triple bond]C-Y] 1 (Y={MCp*(dppe)}; Cp*=pentamethylcyclopentadienyl, M=Fe (1(Fe)), Ru (1(Ru))), have been prepared, and their wirelike and switching behavior, as well as their oxidation chemistry has been investigated. The DTE complexes 1 exhibit photochromic behavior in a manner similar to organic DTE derivatives; UV irradiation causes ring closure of the open isomer 1O to form the
A redox-active diiron complex with the diethynylated dithienylethene (DTE) linker, (dppe)(eta(5)-C(5)Me(5))Fe-C[triple bond, length as m-dash]C-DTE-C[triple bond, length as m-dash]C-Fe(eta(5)-C(5)Me(5))(dppe), shows photochromic behaviour, which switches on and off the communication performance between the two metal centres.
Host-guest interactions of a molecular tweezer complex 1 with various planar organic molecules including polyaromatic hydrocarbons (PAHs) were investigated by 1D and 2D (1)H NMR spectroscopy, UV/Vis absorption and emission titration studies. 2D and DOSY NMR spectroscopies support the sandwiched binding mode based on 1:1 host-guest interactions. The binding constants (K(S)) of complex 1 for various PAHs were determined by NMR titration studies and the values were found to span up to an order of 1
Double sandwich: Phosphorescent molecular double-decker tweezers based on an alkynyl platinum(II) terpyridine system have been synthesized. The tweezers can accommodate two platinum guest complexes, giving rise to drastic color changes (see picture) and near-IR emissions as a result of extended PtII⋅⋅⋅PtII interactions. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online
Recent developments of single-molecule conductance measurements allow us to understand fundamental conducting properties of molecular wires. While a wide variety of organic molecular wires have been studied so far, inorganic and organometallic molecular wires have received much less attention. However, molecular wires with transition-metal atoms show interesting features and functions distinct from those of organic wires. These properties originate mainly from metal-ligand dπ-pπ interactions and
Treatment of freshly made 1,4-diethynylnaphthalene with Cp*(dppe)FeCl in the presence of either NaPF6 or NaBPh4 salts provides the new binuclear organoiron bis(vinylidenes) [Cp*(dppe)Fe═C═CH-1,4-nph-CH═C═Fe(dppe)Cp*][X]2 (X = BPh4, PF6, Nph = naphthalenediyl, Cp* = η5-C5Me5, dppe = 1,2-bis(diphenylphosphino)ethane), 4H2[PF6]2 and 4H2[BPh4]2. The daughter bis(acetylide) complex 4 was obtained upon deprotonation of the vinylidene precursor 4H2[PF6]2 by an excess of potassium tert-butoxide (80%). T
A series of hexaarylbenzenes having two peripheral thienyliron substituents has been prepared, and it is revealed that the two metal centres communicate with each other through toroidal delocalization among the peripheral aromatic groups.
Redox active polyiron complexes with higher dimensional spacers, the tetrairon complex with the two-dimensional tetra(ethynylphenyl)ethene spacer, (C=C)[p-C(6)H(4)-C triple bond C-FeCp*(dppe)](4), and the diiron complex with the three-dimensional spacer (pseudo-m-[2,2]paracyclophane)[C triple bond C-FeCp*(dppe)](2), are prepared, and their performance as molecular wires is evaluated on the basis of their comproportionation constants for the mixed valence state.
This paper describes the thermoelectric properties of molecular junctions incorporating multinuclear ruthenium alkynyl complexes that comprise Ru(dppe)<sub>2</sub> [dppe = 1,2-bis(diphenylphosphino)ethane] fragments and diethylnyl aromatic bridging ligands with thioether anchors. Using the liquid metal technique, the Seebeck coefficient was examined as a function of metal nuclearity, oxidation state, and substituent on the organic ligand backbone. High Seebeck coefficients up to 73 μV/K and appr
Here, we report multinuclear organometallic molecular wires having (2,5-diethynylthiophene)diyl-Ru(dppe)<sub>2</sub> repeating units. Despite the molecular dimensions of 2-4 nm the multinuclear wires show high conductance (up to 10<sup>-2</sup> to 10<sup>-3</sup> <i>G</i> <sub>0</sub>) at the single-molecule level with small attenuation factors (<i>β</i>) as revealed by STM-break junction measurements. The high performance can be attributed to the efficient energy alignment between the Fermi lev
Doppeltes Sandwich: Phosphoreszierende molekulare Pinzettenkomplexe mit Doppeldeckerstruktur basierend auf einem Alkinylplatin(II)-Terpyridinsystem wurden synthetisiert. Die Pinzetten können zwei Platin-Gäste aufnehmen, wodurch eine drastische Farbänderung (siehe Bild) sowie NIR-Emissionen infolge ausgedehnter PtII⋅⋅⋅PtII-Wechselwirkungen resultieren.
This paper deals with the parabolic–elliptic Keller–Segel system with density‐dependent sublinear sensitivity and logistic source, where is a ball with some R >0 and χ >0, 0< α <1, , μ >0, and κ >1. In the case α =1, Winkler (Z. Angew. Math. Phys.; 2018; 69: 40) discovered the condition for κ such that solutions blow up in finite time. The purpose of the present paper is to find conditions for α and κ such that there exist solutions that blow up in finite time in the case of we
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