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The last decade witnessed the successful synthesis of metal nanocrystals in a rich variety of shapes. A typical synthesis can be divided into three distinct stages: nucleation, evolution of nuclei into seeds, and growth of seeds into nanocrystals. As illustrated in the cover picture and discussed by Y. Xia et al. in their Review, the final shape of a nanocrystal is determined primarily by the internal structure of the seed and the binding of the capping agent. http://doi.org/c5fk8w

The last decade witnessed the successful synthesis of metal nanocrystals in a rich variety of shapes. A typical synthesis can be divided into three distinct stages: nucleation, evolution of nuclei into seeds, and growth of seeds into nanocrystals. As illustrated in the cover picture and discussed by Y. Xia et al. in their Review, the final shape of a nanocrystal is determined primarily by the internal structure of the seed and the binding of the capping agent. http://doi.org/c5fk8w

By the biochemical technique of rolling-circle amplification (RCA), a circular oligonucleotide sequence serves as a template for the synthesis of a complementary single-stranded DNA chain. If the DNA chain contains aptamers for a protein such as thrombin or lysozyme, subsequent complexation results in periodic protein–DNA composites. I. Willner et al. describe such compounds and even assemblies of DNA, protein, and gold nanoparticles: http://doi.org/bw32sj

By the biochemical technique of rolling-circle amplification (RCA), a circular oligonucleotide sequence serves as a template for the synthesis of a complementary single-stranded DNA chain. If the DNA chain contains aptamers for a protein such as thrombin or lysozyme, subsequent complexation results in periodic protein–DNA composites. I. Willner et al. describe such compounds and even assemblies of DNA, protein, and gold nanoparticles: http://doi.org/bw32sj

Retro-cycloaddition of easily prepared pyrrolidinofullerenes affords quantitatively pristine fullerenes, and thus can be used as a new protection-deprotection protocol in the chemistry of fullerenes, as shown in the cover picture. In their Communication on page 110 ff., N. Martín, L. Echegoyen, and co-workers report on this promising finding, which has already allowed the selective isolation of the Ih constitutional isomer of Sc3N@C80. http://doi.org/bxx2nc

Retro-cycloaddition of easily prepared pyrrolidinofullerenes affords quantitatively pristine fullerenes, and thus can be used as a new protection-deprotection protocol in the chemistry of fullerenes, as shown in the cover picture. In their Communication on page 110 ff., N. Martín, L. Echegoyen, and co-workers report on this promising finding, which has already allowed the selective isolation of the Ih constitutional isomer of Sc3N@C80. http://doi.org/bxx2nc

A blooming tree illustrates how CO2 can be recycled to a variety of chemicals based on a strategy discussed by T. Cantat and co-workers in their Communication on page 187 ff. The approach relies on the simultaneous use of a functionalizing reagent and a reductant that can be independently adjusted to access a variety of molecules from CO2. The direct conversion of CO2, amines, and silanes to formamides is reported. http://doi.org/c5fr77

A blooming tree illustrates how CO2 can be recycled to a variety of chemicals based on a strategy discussed by T. Cantat and co-workers in their Communication on page 187 ff. The approach relies on the simultaneous use of a functionalizing reagent and a reductant that can be independently adjusted to access a variety of molecules from CO2. The direct conversion of CO2, amines, and silanes to formamides is reported. http://doi.org/c5fr77

Angewandte Chemie 1/2000 http://doi.org/bxjnf4

Angewandte Chemie 1/2000 http://doi.org/bxjnf4

... the environment of the Rb-centered Rb6 octahedron in the compound Na16Rb7Sb7 (Na = anthracite. Rb = blue, Sb = red). The virtually spherical isosurfaces of the partial electron densities are colored according to the values of the electron localization function (high values are white). They support the interpretation of the Rb-centered Rb6 octahedron as Rb− (Rb+)6. More about this unusual antimonide is reported by H. G. von Schnering et al. http://doi.org/fvf2wm

... the environment of the Rb-centered Rb6 octahedron in the compound Na16Rb7Sb7 (Na = anthracite. Rb = blue, Sb = red). The virtually spherical isosurfaces of the partial electron densities are colored according to the values of the electron localization function (high values are white). They support the interpretation of the Rb-centered Rb6 octahedron as Rb− (Rb+)6. More about this unusual antimonide is reported by H. G. von Schnering et al. http://doi.org/fvf2wm

1977 - Charge density analysis by X-ray and neutron diffraction provides information which is otherwise experimentally inaccessible. Problems studied include the nature of single, double, and triple bonds, lone-pair hybridization, and bonding in metals. Details are reported by Philip Coppens http://doi.org/fmrps3

1977 - Charge density analysis by X-ray and neutron diffraction provides information which is otherwise experimentally inaccessible. Problems studied include the nature of single, double, and triple bonds, lone-pair hybridization, and bonding in metals. Details are reported by Philip Coppens http://doi.org/fmrps3

Ulrich Pinder. «Epiphanie medicorum». Nurnberg, 1506. Det Kongelige Bibliotek, København

Ulrich Pinder, Urine Wheel from the book Epiphanie Nuremberg, Germany. It describes the possible colours, smells and tastes of urine, and uses them to diagnose disease.

Dip-Pen Nanolithography makes possible rapid patterning of surfaces on the nanometer scale. The cover picture clearly shows the principles of this technique: the deposition of dye molecules from an atomic force microscopy tip onto a substrate. Feymans 1960 dictum on miniturization, shown in nanometer-sized type in the background, is proving to be once again applicable. Review by C. A. Mirkin et al. http://doi.org/c5fcgt

Dip-Pen Nanolithography makes possible rapid patterning of surfaces on the nanometer scale. The cover picture clearly shows the principles of this technique: the deposition of dye molecules from an atomic force microscopy tip onto a substrate. Feymans 1960 dictum on miniturization, shown in nanometer-sized type in the background, is proving to be once again applicable. Review by C. A. Mirkin et al. http://doi.org/c5fcgt

The cover illustration of the superionic conductor Agl (green: Ag+; red; I-), shows just what a new computer program can accomplish: for the first time it is possible to make a combined representation of experimentally determided crystal structures and calculated periodic potential surfaces for various space group symetries. ... Further details are reported by H. G. von Schnering et al. http://doi.org/c77zcq

The cover illustration of the superionic conductor Agl (green: Ag+; red; I-), shows just what a new computer program can accomplish: for the first time it is possible to make a combined representation of experimentally determided crystal structures and calculated periodic potential surfaces for various space group symetries. ... Further details are reported by H. G. von Schnering et al. http://doi.org/c77zcq

... the structure of a complex formed by self-association of six Cu+ ions (red), as well as three quaterpyridine (blue) and two hexaazatriphenylene ligand molecules (yellow). If a suitable guest molecule were spontaneously and selectively included within the cavity of the complex during self-assembly, this would represent the close association of 12 (!) partners in an elective community (EC), a process in the spirit of 1993 alluded to by the European flag. Lehn et al. http://doi.org/bxm7ms

... the structure of a complex formed by self-association of six Cu+ ions (red), as well as three quaterpyridine (blue) and two hexaazatriphenylene ligand molecules (yellow). If a suitable guest molecule were spontaneously and selectively included within the cavity of the complex during self-assembly, this would represent the close association of 12 (!) partners in an elective community (EC), a process in the spirit of 1993 alluded to by the European flag. Lehn et al. http://doi.org/bxm7ms

Unnatural amino acids can be incorporated as new building blocks into genetic codes  to facilitate studies of protein structure and function. Over 30 unnatural amino acids with modified side chains have been genetically encoded in response to unique triplet and quadruplet codons. L. Wang and P. G. Schultz describe in their Review chemical and biochemical approaches that have been developed to manipulate protein structure and add new amino acids to the genetic code. http://doi.org/cj72qs

Unnatural amino acids can be incorporated as new building blocks into genetic codes to facilitate studies of protein structure and function. Over 30 unnatural amino acids with modified side chains have been genetically encoded in response to unique triplet and quadruplet codons. L. Wang and P. G. Schultz describe in their Review chemical and biochemical approaches that have been developed to manipulate protein structure and add new amino acids to the genetic code. http://doi.org/cj72qs

1979 - A hydrogen atom at the center of an octahedral cage of cobalt atoms—that is a striking structural feature of the title compound which is the first of its kind to be accurately characterized by neutron diffraction in a single crystal. Only few examples of such “interstitial” hydride ligands are known for covalent complexes. The apparent radius of the H atom is 0.53Å; it can readily enter and leave its “metal cage”. Details were reported by Thomas F. Koetzle et al. http://doi.org/c85g7g

1979 - A hydrogen atom at the center of an octahedral cage of cobalt atoms—that is a striking structural feature of the title compound which is the first of its kind to be accurately characterized by neutron diffraction in a single crystal. Only few examples of such “interstitial” hydride ligands are known for covalent complexes. The apparent radius of the H atom is 0.53Å; it can readily enter and leave its “metal cage”. Details were reported by Thomas F. Koetzle et al. http://doi.org/c85g7g

... a model of the “progenitor-TADDOLs” in front of Swiss panorama. The model is flanked by a stylized view of the general mechanistic model for the preferred stereochemical pathway of the Ti–TADDOLate-catalyzed reaction of chelating substrates (left) and a blackboard (right) showing formulae of compounds that can be prepared with high enantioselectivity by nucleophilic addition in the presence of titanium TADDOLates. D. Seebach et al. http://doi.org/c34cxz

... a model of the “progenitor-TADDOLs” in front of Swiss panorama. The model is flanked by a stylized view of the general mechanistic model for the preferred stereochemical pathway of the Ti–TADDOLate-catalyzed reaction of chelating substrates (left) and a blackboard (right) showing formulae of compounds that can be prepared with high enantioselectivity by nucleophilic addition in the presence of titanium TADDOLates. D. Seebach et al. http://doi.org/c34cxz

1984 - The cover shows the structure of a novel hydrocarbon, which, contrary to the Hückel rule is aromatic, despite its 16π-electron periphery. The electronic properties in this “bicalicene” can be described in terms of three mesomeric structures. Further details are reported by Z. Yoshida et al. http://doi.org/csv8cv

1984 - The cover shows the structure of a novel hydrocarbon, which, contrary to the Hückel rule is aromatic, despite its 16π-electron periphery. The electronic properties in this “bicalicene” can be described in terms of three mesomeric structures. Further details are reported by Z. Yoshida et al. http://doi.org/csv8cv

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