339531-03-2Relevant academic research and scientific papers
A Ca2+-, Mg2+-, and Zn2+-Based Dendritic Contractile Nanodevice with Two pH-Dependent Motional Functions
Stadler, Adrian-Mihail,Karmazin, Lydia,Bailly, Corinne
, p. 14570 - 14574 (2016/01/25)
A contractile dendritic motional device is reported where metal ions with biological importance - Ca2+ (the main regulatory and signaling species of the natural muscles), Mg2+, and Zn2+ - initiate two kinds of motional functions. The first motional function is the metal-ion-induced contraction of a linear strand into a Z-shaped dinuclear complex, and the second one is the change of the height of Z-shaped complexes via transmetalation. By means of the pH-dependent counterligand tren, the two motional features of the machine can depend on alternate additions of acid and base. An optical response is associated with the conversion of the linear form (which is yellow) into the metalated Z-shaped one (which is red).
Synthesis, characterization, and properties of binuclear ruthenium complexes with dendritic side chains on their bridges
Wu, Xiang Hua,Liang, Jin Hua,Xia, Jiang Long,Yin, Jun,Jin, Shan,Yu, Guang-Ao,Liu, Sheng Hua
scheme or table, p. 286 - 291 (2011/06/10)
Three binuclear ruthenium complexes with dendritic side chains, 1,4-[RuCl(CO)(PMe3)3CHCH]2C6H 2-2,5-(Gn)2 with Gn = G0 (1), G1 (2), and G2/
Synthesis of oligo(phenylene ethynylene)s with dendrimer "shells" for molecular electronics
Shi, Zi-Fa,Wang, Le-Jia,Wang, Hong,Cao, Xiao-Ping,Zhang, Hao-Li
, p. 595 - 598 (2008/02/02)
Two series of oligo(phenylene ethynylene)s (OPEs) with different dendrimer side groups have been designed and synthesized. The molecules contain thiol groups at both ends to enable interconnection between nanoscale gapped metallic electrodes. The different dendrimer groups act as "shells", allowing tailoring to the nanoscopic environment surrounding the OPE "core". Meanwhile, the dendrimer shells also act as spacers for the precise control of the packing density and intermolecular interaction between the OPE cores.
Insulated molecular wires: Dendritic encapsulation of poly(triacetylene) oligomers, attempted dendritic stabilization of novel poly(pentaacetylene) oligomers, and an organometallic approach to dendritic rods
Schenning, Albertus P. H. J.,Arndt, Jan-Dirk,Ito, Masato,Stoddart, Alison,Schreiber, Martin,Siemsen, Peter,Martin, Rainer E.,Boudon, Corinne,Gisselbrecht, Jean-Paul,Gross, Maurice,Gramlich, Volker,Diederich, Francois
, p. 296 - 334 (2007/10/03)
Multinanometer-long end-capped poly(triacetylene) (PTA) and poly(pentaacetylene) (PPA) oligomers with dendritic side chains were synthesized as insulated molecular wires. PTA Oligomers with laterally appended Frechet-type dendrons of first to third generation were prepared by attaching the dendrons (8, 13, and 17, respectively. Scheme 1) to (E)-enediyne 18 by a Mitsunobu reaction and subsequent Glaser-Hay oligomerization under end-capping conditions (Scheme 2). Whereas first-generation oligomers up to the pentamer were isolated (1a-e), for reasons of steric overcrowding, only oligomers up to the trimer (2a-c) were formed at the second-generation level, and only the end-capped monomer and dimer (3a.b) were isolated at the third-generation level. By repetitive sequences of hydrosilylation (with the Karstedt catalyst), followed by allylation or vinylation, a series of carbosilane dendrons were also prepared (Schemes 3 and 4). Attachment of the second-generation wedge 40 to (E)-enediyne 18, followed by deprotection and subsequent end-capping Hay oligomerization, provided PTA oligomers 4a-d with lateral carbosilane dendrons (Scheme 5). UV/VIS Studies (Figs. 5-10) demonstrated that the insulating dendritic layers did not alter the electronic characteristics of the PTA backbone, even at the higher-generation levels. Despite distortion from planarity due to the bulky dendritic wedges, no loss of π-electron conjugation along the PTA backbone was detected. A surprising (E)-(Z) isomerization of the diethynylethene (DEE) core in the third generation derivative 3a was observed, possibly photosensitized by the bulky Frechet-type dendritic wedge. Electrochemical investigations by steady-state voltammetry and cyclic voltammetry showed that the first reduction potential of the PTA oligomer with Frechet-type dendrons is shifted to more negative values as the dendritic coverage increases. With compounds 5a-c, the first oligomers with a poly(pentaacetylene) backbone were obtained by oxidative Hay oligomerization under end-capping conditions (Scheme 6). The synthesis of dendritic PPA oligomers by oxidative coupling of (E)-enetetrayne 60 under end-capping conditions provided oligomers 61a-d, which were formed as mixtures of stereoisomers due to unexpected thermal (E)-(Z) isomerization (Scheme 8). In another novel approach towards dendritic encapsulation of molecular wires with a Pt-bridged tetraethynylethene (TEE) oligomeric backbone, the trans-dichloroplatinum(II) complex trans-67 with dendritic phosphane ligands (Fig. 14) was coupled under Hagihara conditions to mono-deprotected 69 under formation of the extended monomer 65 (Scheme 12). Again, an unexpected thermal (E)-(Z) isomerization, possibly induced by steric strain between TEE moieties and dendritic phosphane ligands in the unstable complex, led to the isolation of 65 as an isomeric mixture only.
