Master's Dissertation
DOI
https://doi.org/10.11606/D.54.1992.tde-09042014-160458
Document
Author
Full name
Claudio Barberato
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1992
Supervisor
Committee
Castellano, Eduardo Ernesto (President)
Nascimento, Otaciro Rangel
Torriani, Iris C Linares de
Nascimento, Otaciro Rangel
Torriani, Iris C Linares de
Title in Portuguese
Introdução a cristalografia geométrica e determinação de estruturas de pequenas moléculas por difração de raios-X
Keywords in Portuguese
Difração de raios-X
Estrutura de moléculas pequenas
Estrutura de moléculas pequenas
Abstract in Portuguese
Foram determinadas quatro estruturas de complexos de Lantanóides utilizando a difração de raios-X. As intensidades dos feixes difratados foram medidas com um difratômetro automático de 4 ciclos CAD-4. As estruturas foram resolvidas utilizando o método de Patterson, sínteses de Fourier e Fourier Diferença e refinadas por métodos de mínimos quadrados com matriz bloqueada. Os poliedros de coordenação foram obtidos considerando as distâncias quadráticas médias mínimas entre os coordenantes e poliedros ideais. Y(C6H2N3O)3(6H18N3OP)2 e Ho(C6H2N3O)3(C6H18N3OP)2 são complexos isomorfos pertencentes ao sistema monoclínico, P21/n, tendo como parâmetros de rede para o complexo de Y: a = 17.104(2), b = 16.328(1), c = 17.671(6) Å, β = 95.40(1)°, Z = 4, Dc = 1.53 gcm-3, V = 4913(4) Å3; e para o complexo de Ho: a = 17.097(2), b = 16.299(1), c = 17.685(3) Å, β = 95.41(1)°, V = 4907(2) Å3, Dc = 1.63 gcm-3. O poliedro de coordenação para esses complexos é o dodecaedro, simetria D2d (42m). Ce(C6H2N3O)3(C5H12N2O)3, é uma estrutura pertencente ao sistema triclínico, P-1, a = 1.495(5), b = 11.815(5), c = 18.40(1)Å, α = 83.09(5)°, β = 76.7995)°, γ = 77.00(3)°, Z = 2, V = 4800(2)Å3, Dc = 1.63 gcm-3. Existem 8 coordenantes ao redor do átomo pesado formando um Prisma Trigonal Biencapuzado. Nd(C6H2N3O)3(C5H12N2O)3, pertence ao sistema monoclínico, P21/c, a = 18.913(5), b = 12.386(5), c = 22.134(5)Å, β = 120.20(5)°, V = 4800(2)Å3, Dc = 1.63 gcm-3. O número de coordenação é igual a 9 e o poliedro de coordenação é uma forma intermediária entre o antiprisma quadrado monoencapuzado e o prisma trigonal Trigonal Triencapuzado.
Title in English
Introduction to crystallographic symmetry and determination of small molecules structures by X-ray diffraction
Keywords in English
Small molecules structure
X-ray diffraction
X-ray diffraction
Abstract in English
It were determinated four small molecules structures by X-Ray diffraction. The intensities of the reflections were measured with an automatic four-cicle difractometer CAD-4. The structures were solved by Patterson, Fourier Synthesis and refined by least squares methods. The coordination polyedras were obtained considering the minimal root mean distances between the polyedras founded and the ideal polyedras. Y(C6H2N3O)3(6H18N3OP)2 e Ho(C6H2N3O)3(C6H18N3OP)2 are isomorphos strutures belong to the monoclinic system, P21/n; Y: a = 17.104(2), b = 16.328(1), c = 17.671(6) Å, β = 95.40(1)°, Z = 4, Dc = 1.53 gcm-3, V = 4913(4) Å3; Ho: a = 17.097(2), b = 16.299(1), c = 17.685(3)Å, β = 95.41(1)°, V = 4907(2)Å3, Dc = 1.63 gcm-3. The coordination number of these structures is 8 and the coordination polyedra is dodecahedro, with simetry D2d (42m). Ce(C6H2N3O)3(C5H12N2O)3, is a structure belongs to the triclinic system. P-1, a = 1.495(5), b = 11.815(5), c = 18.40(1)Å, α = 83.09(5)°, β = 76.7995)°, γ = 77.00(3)°, Z = 2, V = 4800(2)Å3, Dc = 1.63 gcm-3. There are 8 coordinates around the heavy metal forming a Two-couped Trigonal Prism. Nd(C6H2N3O)3(C5H12N2O)3, belongs to the monoclinic system, P21/c, a = 18.913(5), b = 12.386(5), c = 22.134(5)Å, β = 120.20(5)°, V = 4800(2)Å3, Dc = 1.63 gcm-3. The coordination number is a 9 and the coordination polyedra is intermediate between mono-couped square antiprism and three-couped trigonal.
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