共查询到20条相似文献,搜索用时 15 毫秒
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Schelter EJ Veauthier JM Graves CR John KD Scott BL Thompson JD Pool-Davis-Tournear JA Morris DE Kiplinger JL 《Chemistry (Weinheim an der Bergstrasse, Germany)》2008,14(26):7782-7790
Reaction of two equivalents of [(C(5)Me(4)Et)(2)U(CH(3))(Cl)] (6) or [(C(5)Me(5))(2)Th(CH(3))(Br)] (7) with 1,4-dicyanobenzene leads to the formation of the novel 1,4-phenylenediketimide-bridged bimetallic organoactinide complexes [{(C(5)Me(4)Et)(2)(Cl)U}(2)(mu-{N==C(CH(3))-C(6)H(4)-(CH(3))C==N})] (8) and [{(C(5)Me(5))(2)(Br)Th}(2)(mu-{N==C(CH(3))-C(6)H(4)- (CH(3))C==N})] (9), respectively. These complexes were structurally characterized by single-crystal X-ray diffraction and NMR spectroscopy. Metal-metal interactions in these isovalent bimetallic systems were assessed by means of cyclic voltammetry, UV-visible/NIR absorption spectroscopy, and variable-temperature magnetic susceptibility. Although evidence for magnetic coupling between metal centers in the bimetallic U(IV)/U(IV) (5f(2)-5f(2)) complex is ambiguous, the complex displays appreciable electronic communication between the metal centers through the pi system of the dianionic diketimide bridging ligand, as judged by voltammetry. The transition intensities of the f-f bands for the bimetallic U(IV)/U(IV) system decrease substantially compared to the related monometallic ketimide chloride complex, [(C(5)Me(5))(2)U(Cl){-N==C(CH(3))-(3,4,5-F(3)-C(6)H(2))}] (11). Also reported herein are new synthetic routes to the actinide starting materials [(C(5)Me(4)Et)(2)U(CH(3))(Cl)] (6) and [(C(5)Me(5))(2)Th(CH(3))(Br)] (7) in addition to the syntheses and structures of the monometallic uranium complexes [(C(5)Me(4)Et)(2)UCl(2)] (3), [(C(5)Me(4)Et)(2)U(CH(3))(2)] (4), [(C(5)Me(4)Et)(2)U{-N==C(CH(3))-C(6)H(4)-C==N}(2)] (10), and 11. 相似文献
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Stéphane Le Gac Luca Fusaro Vincent Dorcet Bernard Boitrel 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(40):13253-13253
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Dr. Emilio Pardo Jesús Ferrando‐Soria Dr. Marie‐Claire Dul Dr. Rodrigue Lescouëzec Dr. Yves Journaux Dr. Rafael Ruiz‐García Dr. Joan Cano Prof. Dr. Miguel Julve Prof. Dr. Francesc Lloret Dr. Laura Cañadillas‐Delgado Dr. Jorge Pasán Prof. Dr. Catalina Ruiz‐Pérez 《Chemistry (Weinheim an der Bergstrasse, Germany)》2010,16(43):12762-12762
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Lucy Rutten Dr. Birgit Wieczorek Jean‐Paul B. A. Mannie Cornelis A. Kruithof Dr. Harm P. Dijkstra Dr. Maarten R. Egmond Prof. Martin Lutz Dr. Robertus J. M. Klein Gebbink Prof. Piet Gros Prof. Gerard van Koten Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(17):4211-4211
The interfacial enzyme cutinase…? shown at the air–water interface on the cover, was site‐selectively modified with two different ECE‐pincer–metal complexes. The resulting cutinase–pincer–metal hybrids crystallized under halide‐rich conditions to give monomeric crystal structures, but also crystallized under halide‐poor conditions to form a metal‐induced dimer. See the Full Paper by R. J. M. Klein Gebbink, P. Gros, G. van Koten et al. on page 4270 ff. , for details of the chemistry and the crystal structures. Photograph: View from the island of Saba (Netherlands Antilles) taken by Birgit Wieczorek. Design: Birgit Wieczorek and Cornelis A. Kruithof.
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Qinyu Song Dr. Olaf Stefanczyk Guanping Li Dr. Kunal Kumar Kazuki Nakamura Dr. Koji Nakabayashi Prof. Shin-ichi Ohkoshi 《欧洲无机化学杂志》2023,26(30):e202300482
The spin-crossover (SCO) and charge-transfer (CT) phenomena, the switching processes between two distinguishable magnetic states, are promising for developing materials capable of sophisticated memory and sensing functionalities. The majority of SCO systems are based on iron(II) complexes. However, cobalt(II)-2,2′:6′,2′′-terpyridine (terpy) systems emerge as a promising alternative. In this work, new complex salts [CoII(terpy)2]2[MoIV(CN)8] ⋅ 15H2O, Co2Mo (H2O), and [CoII(terpy)2]3[WV(CN)8]2 ⋅ 12H2O, Co3W2 (H2O) were synthesized and physiochemically characterized. Structural studies for both compounds revealed [Co(terpy)2]2+ layers pillared by octacyanidometallate anions and completed with water molecules between them. Magnetic studies confirmed that the (de)solvated phases of both complexes exhibit partial SCO on the cobalt(II) centers: CoII−LS (SCo(II)-LS=1/2)↔CoII−HS (SCo(II)-HS=3/2). Moreover, handling dehydrated samples in a high-humidity environment leads to partial recovery of previous magnetic properties via humidity-induced SCO for Co2Mo : CoII−HS→CoII−LS, and the new phenomenon of isothermal humidity-activated charge-transfer-induced spin transition, which we define here as HACTIST, for Co3W2 : CoII−HS⋅⋅⋅WV (SCo(II)-HS=3/2 and SW(V)=1/2)→CoIII−LS⋅⋅⋅WIV (SW(IV)=0 and SCo(III)-LS=0). These comprehensive studies shed light on the water-solvation-dependent spin transitions in Co(II)-octacyanidometallate(IV/V) complexes. 相似文献
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Back Cover: Characterization of Paramagnetic Reactive Intermediates: Predicting the NMR Spectra of Iron(IV)–Oxo Complexes by DFT (Chem. Eur. J. 37/2015) 下载免费PDF全文
Dr. Andrea Borgogno Dr. Federico Rastrelli Prof. Alessandro Bagno 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(37):13140-13140
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