| dc.contributor.author | Borecka, Bozena. | en_US |
| dc.date.accessioned | 2014-10-21T12:37:32Z | |
| dc.date.available | 1992 | |
| dc.date.issued | 1992 | en_US |
| dc.identifier.other | AAINN80147 | en_US |
| dc.identifier.uri | http://hdl.handle.net/10222/55324 | |
| dc.description | The work reported here examines various aspects of a study of the fine details in X-ray structure determination. It is divided into three parts. | en_US |
| dc.description | 1. Charge density studies of the benzene clathrate of hexa(aziridinyl)cyclotriphosphazene. The object of this part was to investigate the bonding electron density in the phosphazene ring and to answer, from a charge density study, the long-debated question about the nature of phosphazene -P=N- bonds. The charge densities on the benzene ring and aziridinyl groups were also examined and are exactly as predicted. These observations are used to validate the charge density observed for the phosphazene ring which confirms that Dewar's original island delocalization model for the -P=N-P- system is essentially correct. | en_US |
| dc.description | 2. Charge density studies of a supposed aromatic 10-electron $p\pi$-$p\pi$ system. The object of this part was to see if a proposed aromatic 3p$\pi$-3p$\pi$ bonding in a hetero-bicyclic benzodithiaphospholium cation could be confirmed by an examination of the bonding electron density. The neutral non-aromatic analogue (benzodithiaphosphole) was also examined to provide the necessary comparison. While it was possible to confirm that the neutral analogue had all the expected bonding density features, disorder phenomena in the cation structure made the identification of the aromatic 10e p$\pi$-p$\pi$ system rather tentative. | en_US |
| dc.description | 3. Precise determination of the factors influencing the observed structures of the neutral series of compounds $XPh\sb4$ (X = C, Si, Ge, Sn, Pb). The factors which control the fine details of the molecular structure were explored and the inter-relation between the molecular shape and the crystal packing is discussed. | en_US |
| dc.description | Thesis (Ph.D.)--Dalhousie University (Canada), 1992. | en_US |
| dc.language | eng | en_US |
| dc.publisher | Dalhousie University | en_US |
| dc.publisher | | en_US |
| dc.subject | Chemistry, Inorganic. | en_US |
| dc.subject | Chemistry, Physical. | en_US |
| dc.title | The chemical implication of charge density distribution for heterocyclic rings, and the conformational consequences of the packing in XPh(4) (X = carbon, silicon, germanium, tin, lead) and related crystals. Crystallography and molecular modelling. | en_US |
| dc.type | text | en_US |
| dc.contributor.degree | Ph.D. | en_US |
