منابع مشابه
Organization of acenes with a cruciform assembly motif.
This study explores the assembly in the crystalline state of a class of pentacenes that are substituted along their long edges with aromatic rings forming rigid, cruciform molecules. The crystals were grown from the gas phase, and their structures were compared with DFT-optimized geometries. Both crystallographic and computed structures show that a planar acene core is the exception rather than...
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متن کاملCompetitive superhelical transitions involving cruciform extrusion
A DNA molecule under negative superhelical stress becomes susceptible to transitions to alternate structures. The accessible alternate conformations depend on base sequence and compete for occupancy. We have developed a method to calculate equilibrium distributions among the states available to such systems, as well as their average thermodynamic properties. Here we extend this approach to incl...
متن کاملCruciform pi-systems for molecular electronics applications.
This study details a modular and general synthesis of a new class of molecules consisting of cruciform pi-systems. The key to synthesizing these molecules was an unprecedented double Staudinger cyclization. Once formed, these rigid compounds assemble into ordered monolayer films on metal and metal oxide surfaces to orient their conjugated, bis-phenyloxazole subunits upright. This surface orient...
متن کاملSlow cruciform transitions in palindromic DNA.
Extrusion of cruciform structures in self-complementary regions of DNA is known to be favored by negative supercoiling of DNA. We show here that, in moderately supercoiled DNA, cruciform extrusion is a very slow process. In plasmid pUC7 DNA, with a 48-base-pair palindrome, the half-time of extrusion at 50 degrees C is typically several hours; rates are even slower at lower temperature. The rate...
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ژورنال
عنوان ژورنال: KIVA
سال: 1971
ISSN: 0023-1940,2051-6177
DOI: 10.1080/00231940.1971.11757748