Papers - FURUKAWA Ko

Oxidative direct coupling of metalloporphyrins

Y Nakamura, N Aratani, A Tsuda, A Osuka, K Furukawa, T Kato

JOURNAL OF PORPHYRINS AND PHTHALOCYANINES   7 ( 4-5 )   264 - 269   2003

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：WORLD SCI PUBL CO INC  

A variety of directly-linked diporphyrins can be prepared by an oxidative coupling reaction of 5,15-diaryl metalloporphyrins. Regioselectivity of the coupling reaction depends on the metal in the porphyrin core; Zn-II-porphyrins favor meso-meso coupling and Pd-II-porphyrins favor meso-beta coupling. beta-beta Linked diporphyrins were isolated for the first time from the oxidation of 5,15-diaryl Pd-II-porphyrin with DDQ and Sc(OTf)(3). Copyright (C) 2003 Society of Porphyrins & Phthalocyanines.

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Low-dimensional molecule-based magnets with hydrogen-bonded network

M Sakai, J Toyoda, M Mitsumi, K Nakasuji, K Furukawa, D Shiomi, K Sato, T Takui

SYNTHETIC METALS   121 ( 1-3 )   1776 - 1777   2001.3

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE SA  

Cu (II) complexes with violuric acid ligand were synthesized, and the relationship between the structures and magnetic properties of these complexes were examined, focussing on the role of the hydrogen-bonded network on their magnetic properties. The X-ray crystal structural analyses show that these complexes form three-dimensional hydrogen-bonded network (1), as well as two-dimensional sheet structures for some cases (2, 3). The temperature dependence of the magnetic susceptibility of 1 revealed the low-dimensional antiferromagnetic interactions. The marked g-shift for L was observed from the temperature dependence of the ESR spectra. From the Xray diffraction at 173 K, it is revealed that the marked g-shift for I originates in the cooperative Jahn-Teller assisted hydrogen-bonding variation.

DOI： 10.1016/S0379-6779(00)00742-6

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A Novel Spin Wave from Low-Dimensional Superlatticce of Microstructured Ferromagnetic Thin Films

K. Furukawa, D. Shiomi, K. Sato, T. Takui, K. Itoh, A. Maeda, M. Kume, K. Shibata, I. Nakatani

Mol. Cryst. Liq. Cryst.   335   163 - 172   1999

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DOI： 10.1080/10587259908028860

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