Über die Epitaxie von Vitamin B12 auf Quarz
Abstract
The crystallographical expectation of different behaviour of crystals with asymmetric molecules against the optical antipodes of quartz was not exactly proved up to date. The weak asymmetry of the potential field of the crystal surfaces was probably the cause. We awaited a distinct effect from a substance consisting of large complex molecules like vitamin B12.
The epitaxial effect is extremely selective. The orientation of the vitamin crystals was splendidly positive upon the polished l-quartz surfaces activated by etching with HF, never upon r, quartz. There were found and described 18 laws of orientation of the vitamin crystals upon the faces (10[unk]0), (11[unk]0), ([unk][unk]20), (10[unk]1). (01[unk]1), (0001). The laws could be formulated as one-dimensional structure analogies.
The structural interpretation of the molecular kinetics, i.e. adsorption, formation of H bridges between both active groups and seed formation gave a new outlook upon the existence of small molecular matrices of very different size at the surfaces for this catalytic process which leads to the macroscopic appearance of the overranging one-dimensional analogies. The proof of a total mismatch of every matrix system with respect to the vitamin upon the r quartz is especially interesting.
Artikel in diesem Heft
- Crystal structure of magnesium potassium sulfate hexahydrate MgK2(SO4)2 · 6H2O
- The crystal structure of glauberite, CaNa2(SO4)2
- Beziehungen zwischen den Strukturen der Modifikationen des Platin- und Kupferphthalocyanins und einiger Chlorderivate*
- Über die Epitaxie von Vitamin B12 auf Quarz
- The crystal structure of arsenic tribromide*
- Stacking faults in cronstedtite and other kaolin-type silicates
- Crystal chemistry of alpha-boron derivatives
- The crystal and molecular structure of bis(hydrazine)zinc bis(hydrazincarboxylate-N′,O)
- The crystal and molecular structure of chrysazin
- Hydrogen bonding in o-aminophenol hydrochloride
- Bestimmung der Struktur von Diphenantridylmethan mit der Methode der diffusen Streuung*
- A simple stereographic plotting table
- Elastische und thermoelastische Eigenschaften von CaSO4 · 2H2O (Gips)
- The unit cell and space group of gadolinium molybdate and of scandium tungstate
- An x-ray study of 2,5-dichloro-nitrobenzene
- The space group of anhydrous copper propionate
- An x-ray study of 3-nitro 4-toluidine
- Space group and unit-cell dimensions of 7-chloro, 4-methyl coumarin
- Crystal structures.
- Exhibition of Photographs of Crystallographic Interest
Artikel in diesem Heft
- Crystal structure of magnesium potassium sulfate hexahydrate MgK2(SO4)2 · 6H2O
- The crystal structure of glauberite, CaNa2(SO4)2
- Beziehungen zwischen den Strukturen der Modifikationen des Platin- und Kupferphthalocyanins und einiger Chlorderivate*
- Über die Epitaxie von Vitamin B12 auf Quarz
- The crystal structure of arsenic tribromide*
- Stacking faults in cronstedtite and other kaolin-type silicates
- Crystal chemistry of alpha-boron derivatives
- The crystal and molecular structure of bis(hydrazine)zinc bis(hydrazincarboxylate-N′,O)
- The crystal and molecular structure of chrysazin
- Hydrogen bonding in o-aminophenol hydrochloride
- Bestimmung der Struktur von Diphenantridylmethan mit der Methode der diffusen Streuung*
- A simple stereographic plotting table
- Elastische und thermoelastische Eigenschaften von CaSO4 · 2H2O (Gips)
- The unit cell and space group of gadolinium molybdate and of scandium tungstate
- An x-ray study of 2,5-dichloro-nitrobenzene
- The space group of anhydrous copper propionate
- An x-ray study of 3-nitro 4-toluidine
- Space group and unit-cell dimensions of 7-chloro, 4-methyl coumarin
- Crystal structures.
- Exhibition of Photographs of Crystallographic Interest
