Search

In 2002, the National Trust commissioned a detailed survey of the timberwork of the moated manor house at Baddesley Clinton, coupled with an extensive dendrochronology programme. The results have radically revised our understanding of the house and of the way that its complex development reflects the changing circumstances and social expectations of its occupiers from the medieval period to the nineteenth century. The integration of documentary sources, structural analysis and tree-ring dating has enabled the house to be portrayed as the product of a quest for greater comfort and privacy, of social responses to changing family circumstances and of the exercise of dower rights by widows, resulting in several periods of joint occupancy. [ABSTRACT FROM AUTHOR]

Single-crystal X-ray diffraction has yielded new crystal structures for cesium formate (CsOOCH) and rubidium formate (RbOOCH). The cesium formate structure has the same unit cell and space group as that published from powder X-ray diffraction data (Masuda, Y.; Yahata, A.; Ogawa, H. Inorg. Chem. 1995, 34, 3130-3133) but differs radically in the placement and orientation of the formate ions. The new crystal structure has been successfully modeled with an empirical force field based on pair potentials, whereas it proved impossible to develop a force field that gave an adequate description of the powder structure. For rubidium formate, the gross structure is similar to that previously published (Masuda, Y.; Morita, W.; Yahata, A.; Yukawa, Y. Thermochim. Acta 1998, 318, 39-43), but the space group includes a mirror plane (Pbcm rather than Pbc21). From this information, we have been able to analyze the effect of the cation size on the crystal structure for alkali-metal formates. [ABSTRACT FROM AUTHOR]

The title compound has been synthesised and its structure determined by X-ray diffraction. The structure comprises a single strand polymer, with five independent Gd units in the crystallographic asymmetric unit. Each gadolinium atom has eight-coordinate bicapped trigonal prismatic geometry, co-ordinated by one terminal chlorine atom, four bridging chlorine atoms, two water molecules and one acetonitrile. Linkage to neighbouring metal centres is by double halogen bridges. The mean co-ordination distances are: Gd&z.sbnd;Cl 2.822 (bridging) and 2.676 A˚ (terminal), Gd&z.sbnd;O, 2.362 and Gd&z.sbnd;N, 2.538 A˚. [Copyright &y& Elsevier]

Novel Cu[sup II] complexes CuLC[sub I]2 (L = 1-4) have been synthesized containing the metal bound to a well-known type of tetracyclic bisaminal formed from the condensation of glyoxal and tetraazamacrocycles (1 = cyclam-glyoxal condensate, 2 = [13]aneN4-glyoxat condensate, 3 = cyclen-glyoxal condensate, 4 = isocyclam-glyoxal condensate). The four-coordinate complexes were characterized by X-ray crystallography, electronic spectroscopy, solid-state magnetic moments, and electron spin resonance spectroscopy. The tetracyclic bisaminals, although having four potential donor atoms, are bound in a cis-bidentate fashion to Cu[sup II] with two additional cis-chloride donors. The ligands take up folded conformations, and with the exception of ligand 4, only nonadjacent nitrogen atoms coordinate. As expected, ligand 2 in Cu(2)Cl[sub 2] has a folded structure similar to those of the previously characterized 1 and 3. The conformation of 4 in the complex Cu(4)CI[sub 2] differs from 1-3 in that three nitrogens direct their lone pairs to one side of the folded tetracycle, with adjacent nitrogen atoms coordinated to Cu[sup II]. This difference is probably caused by the presence of the more flexible seven-membered ring rather than the five- to six-membered rings in 1-3. Air oxidation of Cu[sup I] in the presence of 1 or 3 results in bis(µ-hydroxo) dimers as characterized by X-ray crystal structures, suggesting dioxygen binding, followed by O-O bond splitting to give the Cu[sub 2]O[sub 2] diamond core. [ABSTRACT FROM AUTHOR]

Examines the synthesis of iron(II) and manganese(II) complexes derived from a topologically constrained ligand. Identification of rigid preorganized conformation for complex formation; Determination of high spin adduct in the manganese complex; Reactions of the complexes with tert-butyl hydroperoxide and hydrogen peroxide.

Identifies the materials and methods used in the synthesis and characterization of functionalized diphenylformamidine dimers and complexes. Effect of temperature on the coupling behavior of samples; Correlation of coordination number with thermal and structural stability; Implication of molecular weight measurements on the aggregation of compounds.

Examines the chemical reaction of triamidoamine complexes with actinide halides and amides. Molecular structures of bromide, iodide and diethylamide; Characterization of triamidoamine complexes; Role of trimethylsilyl-substituted ligand in monomeric species production; Role of tert-butyldimethylsilyl-substituted triamidoamine.

Presents a study related to a different type of isomerism which has been detected in the cyclidene family of lacunar dioxygen carriers. Reference to the family of bicyclic [16]cyclidene complexes; Research methodology; Results of this study; Statistical data.

Presents information on a study which demonstrated the design and synthesis of a family of tridentate Schiff base ligands for use in octahedral molecular templates. Experimental details; Results and discussion; Characterization of octahedral metal ion complexes; Conclusions.

Presents a study which examined the preparation of dicompartmental ligands bearing picolyl pendant arms on their amine nitrogen donors, using one-step routes, via the Mannich condensation. Characterization of several derivatives; Methodology used to conduct the study; Findings of the study.