Supramolecular Compound (supramolecular + compound)

Distribution by Scientific Domains


Selected Abstracts


Synthesis, Structure and Photochromic Properties of a Novel 1,6-Hexanediamine Trimolybdate Supramolecular Compound.

CHEMINFORM, Issue 22 2007
Dehui Sun
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]


Characterization of spin crossover crystal surface by AFM

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 5 2010
C. Chong
Abstract Imaging nano-domains in spin crossover (SCO) compounds remains so far an unreached goal. We report on the first AFM tapping-mode investigation of SCO single crystals, performed at room temperature with the well known mononuclear compound [Fe(ptz)6](BF4)2 (ptz,=,1-propyl-tetrazole) and the trinuclear supramolecular compound [Fe3(hyetrz)6(H2O)6](CF3SO3)6 (hyetrz,=,4-(2,-hydroxyethyl)-1,2,4-triazole) which shows a gradual spin conversion centred at room temperature. The natural surface of the former crystal revealed a volatile coating of the scanned area attributed to the transport of adsorbed water under the effect of interaction with the AFM tip. The second one showed astonishing leopard-skin patterns assigned to the effect of atmospheric humidity on this hygroscopic compound. Their origin is discussed. We suggest the use of fluid coating layers as a general method for revealing the nano-patterning of physical properties (e.g. like-spin domains) at the surface of dielectric materials. AFM-tapping images of [Fe3(hyetrz)6(H2O)6](CF3SO3)6 at room temperature and ambient atmosphere. [source]


5,7,7,12,14,14-Hexamethyl-4,11-diaza-1,8-diazonia­cyclo­tetra­decane penta­cyano­nitroso­ferrate(II) dihydrate: a supramolecular compound constructed by hydrogen bonds

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 4 2006
Ai-Hua Yuan
The title compound, (C16H38N4)[Fe(CN)5(NO)]·2H2O, contains one [Fe(CN)5(NO)]2, dianion, two half [H2teta]2+ dications (teta is 5,7,7,12,14,14-hexa­methyl-1,4,8,11-tetra­aza­cyclo­tetra­decane), each lying about an independent inversion centre, and two solvent water mol­ecules, all of which are held together by hydrogen bonds to form a three-dimensional supramolecular framework. [source]


Crystal structure, thermal analysis and theoretical calculation of a one-dimensional chain complex [zn(dafo)2(H2O)2](NO3)2

CHINESE JOURNAL OF CHEMISTRY, Issue 8 2004
Rong-Lan Zhang
Abstract A novel one-dimensional chain complex [Zn(dafo)2(H2O)2](NO3)2 was obtained when we tried synthesizing a mixed ligand supramolecular compound of Zinc(II) with dafo and o -phthalic acid. Its structure was determined by single-crystal X-ray diffraction analysis. The crystal belongs to triclinic system, P -1 space group. The crystallographic data: a=0.6989(4) nm, b=0.8281(5) nm, c=1.0231(5) nm, ,=94.934(5)°, ,=91.366(7)°, ,=99.820(7)°, V=0.5809(5) nm3, Z= 1, F(000)=300, Mr=589.78, Dc=1.686 g/cm3, ,(Mo K,)=1.130 mm,1, R1=0.0521, wR2=0.1096. The analysis of the crystal structure indicates that the compound has a one-dimensional chain structure which is formed by hydrogen bonds. The constitutes of the title complex were proved by elemental analysis, IR spectra and thermal analysis. On the basis of the experimentation, the complex was calculated by DFT-B3LW/LANL2DZ in Gaussian-98w also. [source]


Nuclear aggregates of polyamines

IUBMB LIFE, Issue 2 2006
Luciano D'Agostino
Abstract Nuclear aggregates of polyamines (NAPs) are cyclic supramolecular compounds made of polyamines and phosphate groups. Three different aggregates, s-NAP, m-NAP and l-NAP, with a molecular weight of 1035, 5175 and 9552 Da, respectively, are described. These molecules interact with genomic DNA. In consequence of this interaction, NAPs not only protect DNA from nucleases with extraordinarily greater efficiency than single polyamines (spermine, spermidine and putrescine), but also induce noticeable changes in DNA condensation status, as shown by temperature-dependent modifications of DNA electrophoretic properties. The biochemical characterization of these compounds has allowed the definition of a structural model for each NAP. According to this model, five s-NAPs assemble together to form a m-NAP unit. We hypothesize that the complexation of s-NAP into m-NAP favours the transition to Z-DNA through the progressive widening of DNA strands and the exposure of bases. We propose that NAPs, by wrapping the DNA helixes, form supramolecular tunnel-like structures that confer efficient protection without affecting DNA elasticity. iubmb Life, 58: 75-82, 2006 [source]