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151.
Jing Xu Qing Liu Taka-aki Okamura Man-Sheng Chen Wei-Yin Sun Norikazu Ueyama 《Solid State Sciences》2009,11(11):1903-1907
Reactions of ligand 5-(1H-imidazol-4-yl)methylaminoisophthalic acid (H3L) with varied lanthanide metal salts led to the formation of five scalelike 2D layered complexes {[Ln(H2L)(HL)(H2O)2]·H2O}n [Ln(III) = Pr(III) (1), Nd(III) (2), Sm(III) (3), Gd(III) (4), Tb(III) (5)]. The single crystal X-ray diffraction analyses revealed that five complexes crystallized in the same monoclinic space group C2/c are isomorphous and isostructural, and the 2D networks are further connected by hydrogen bonds and π–π interactions resulting in formation of 3D structures. Investigations on the visible luminescent property of the complexes demonstrate that compounds 3 and 5 show characteristic emissions of Sm(III) and Tb(III) in the solid state at room temperature, respectively. 相似文献
152.
Binding of Scandium Ions to Metalloporphyrin–Flavin Complexes for Long‐Lived Charge Separation 下载免费PDF全文
Prof. Dr. Takahiko Kojima Ryosuke Kobayashi Dr. Tomoya Ishizuka Shinya Yamakawa Dr. Hiroaki Kotani Dr. Tatsuaki Nakanishi Dr. Kei Ohkubo Dr. Yoshihito Shiota Prof. Dr. Kazunari Yoshizawa Prof. Dr. Shunichi Fukuzumi 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(47):15518-15532
A porphyrin–flavin‐linked dyad and its zinc and palladium complexes (MPor?Fl: 2 ?M, M=2 H, Zn, and Pd) were newly synthesized and the X‐ray crystal structure of 2 ?Pd was determined. The photodynamics of 2 ?M were examined by femto‐ and nanosecond laser flash photolysis measurements. Photoinduced electron transfer (ET) in 2 ?H2 occurred from the singlet excited state of the porphyrin moiety (H2Por) to the flavin (Fl) moiety to produce the singlet charge‐separated (CS) state 1(H2Por.+?Fl.?), which decayed through back ET (BET) to form 3[H2Por]*?Fl with rate constants of 1.2×1010 and 1.2×109 s?1, respectively. Similarly, photoinduced ET in 2 ?Pd afforded the singlet CS state, which decayed through BET to form 3[PdPor]*?Fl with rate constants of 2.1×1011 and 6.0×1010 s?1, respectively. The rate constant of photoinduced ET and BET of 2 ?M were related to the ET and BET driving forces by using the Marcus theory of ET. One and two Sc3+ ions bind to the flavin moiety to form the Fl?Sc3+ and Fl?(Sc3+)2 complexes with binding constants of K1=2.2×105 M ?1 and K2=1.8×103 M ?1, respectively. Other metal ions, such as Y3+, Zn2+, and Mg2+, form only 1:1 complexes with flavin. In contrast to 2 ?M and the 1:1 complexes with metal ions, which afforded the short‐lived singlet CS state, photoinduced ET in 2 ?Pd???Sc3+ complexes afforded the triplet CS state (3[PdPor.+?Fl.??(Sc3+)2]), which exhibited a remarkably long lifetime of τ=110 ms (kBET=9.1 s?1). 相似文献
153.
Tatsuaki Yashima 《Reaction Kinetics and Catalysis Letters》2005,84(2):229-235
Summary K-Ca-promoted Ni/&agr;-Al2O3 catalyst exhibited higher activity better coke-resistance than Ni/&agr;-Al2O3 for CH4 reforming with CO2 under different reaction conditions. Temperature-programmed activation process of CH4 reforming with CO2 was investigated on these catalysts. 相似文献
154.
Gen-Etsu Matsubayashi Kosuke Ueyama Kazumi Nakatsu 《Journal of organometallic chemistry》1982,240(1):103-105
An X-ray structure analysis for the title complex obtained by the reaction of PtIICL2(C5H4NC(O)C?H+NC5H3(CH3)2-3.5) with ethylenediamine in water has revealed the presence of an ylide carbon atom which is coordinated to the platinum(II) ion with an sp2 configuration. 相似文献