Sequence-selective assembly of tweezer-molecules on linear templates enables frameshift-reading of sequence information

Monomer-sequence information in synthetic copolyimides can be recognised by tweezer-type molecules binding to adjacent triplet-sequences on the polymer chains. In the present paper different tweezer-molecules are found to have different sequence-selectivities, as demonstrated in solution by 1H NMR spectroscopy and in the solid state by single crystal X-ray analyses of tweezer-complexes with linear and macrocyclic oligo-imides. This work provides clear-cut confirmation of polyimide chain-folding and adjacent-tweezer-binding. It also reveals a new and entirely unexpected mechanism for sequence-recognition which, by analogy with a related process in biomolecular information processing, may be termed "frameshift-reading". The ability of one particular tweezer-molecule to detect, with exceptionally high sensitivity, long-range sequence-information in chain-folding aromatic copolyimides, is readily explained by this novel process

Probing Donor-Acceptor Interactions and Co-Conformational Changes in Redox Active Desymmetrized [2]Catenanes

The Spanish language translation of Raíz [Root], the first work of Constandinos Tsimas. The author introduces himself by means of a singular philosophical approach, “man as a coordinate”, superlative in his totality, earthling. The aesthetics of the poems has a sober style; one foot in realism, the other in geometric surrealism. With lyrical rawness, the poet sinks into the existential search for meanings and values —truth, honesty, our instincts, creation, improvement, liberty— to stand up with full force, capable of feeling, acting and facing life with momentum.Traducción al español de Raíz, la primera obra de Constandinos Tsimas. El autor se presenta mediante un acercamiento filosófico singular, “el hombre como coordenada”, superlativo en su totalidad, terrícola. La estética de los poemas tiene un estilo sobrio, con un pie en el realismo y otro en el surrealismo geométrico. Con una crudeza lírica el poeta se sumerge en la búsqueda existencial de los sentidos y los valores —la verdad, la honradez, nuestros instintos, la creación, la superación, la libertad— para alzarse con toda su fuerza, capaz de sentir, de actuar y de lanzarse con ímpetu a la vida

Heteroaromatic organic compound with conjugated multi-carbonyl as cathode material for rechargeable lithium batteries

The heteroaromatic organic compound, N,N\u27-diphenyl-1,4,5,8-naphthalenetetra-carboxylic diimide (DP-NTCDI-250) as the cathode material of lithium batteries is prepared through a simple one-pot N-acylation reaction of 1,4,5,8-naphthalenetetra-carboxylic dianhydride (NTCDA) with phenylamine (PA) in DMF solution followed by heat treatment in 250 °C. The as prepared sample is characterized by the combination of elemental analysis, NMR, FT-IR, TGA, XRD, SEM and TEM. The electrochemical measurements show that DP-NTCDI-250 can deliver an initial discharge capacity of 170 mAh g-1 at the current density of 25 mA g-1. The capacity of 119 mAh g-1 can be retained after 100 cycles. Even at the high current density of 500 mA g-1, its capacity still reaches 105 mAh g-1, indicating its high rate capability. Therefore, the as-prepared DP-NTCDI-250 could be a promising candidate as low cost cathode materials for lithium batteries