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Inheritance of guanidinium chloride structure in two Molybdenum(II) chloride salts
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
2005 (English)In: Comptes rendus. Chimie, ISSN 1631-0748, E-ISSN 1878-1543, Vol. 8, no 11-12, 1750-1759 p.Article in journal (Refereed) Published
Abstract [en]

Depending on the proticity of the solvent, two different salts may be crystallized from the combination of solutions of guanidinium chloride, C(NH2)3Cl, and the acidic hydrate of molybdenum dichloride, [(Mo6Cl8)Cl6](H20O9). From aprotic solvents such as dimethyl sulfoxide (DMSO) or formamide (FA), compound I, [(Mo6Cl8)Cl6]Cl6(C(NH2)3)8, crystallizes, while from protic solvents such as ethanol or water, compound II, [(Mo6Cl8)Cl6]Cl3(C(NH2)3)5, crystallises. In both compounds, the basic motif of the two parent structures, the octahedral [(Mo6Cl8)Cl6]2– cluster and the planar, triangular, C(NH2)3Cl3 entity are fairly well preserved. The assembly of the blocks, however, differs distinctly, and while both compounds are rather porous, compound I (s.g. Fm

m, No. 225) has a volume of 27 Å3/non-hydrogen atom, compound II (s.g. C2/c, No. 15) is somewhat denser, with a volume of 24 Å3/non-hydrogen atom.

Place, publisher, year, edition, pages
Elsevier SAS , 2005. Vol. 8, no 11-12, 1750-1759 p.
Keyword [en]
Molybdenum octahedral cluster; Guanidine; Crystal structure; Single-crystal X-ray diffraction
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-23804DOI: 10.1016/j.crci.2005.06.002OAI: oai:DiVA.org:su-23804DiVA: diva2:194586
Note
Part of urn:nbn:se:su:diva-491Available from: 2005-05-04 Created: 2005-05-04 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Solide Molydbenum(II) Chloride Cluster compounds From a Hudrogen Bonding Poin of View
Open this publication in new window or tab >>Solide Molydbenum(II) Chloride Cluster compounds From a Hudrogen Bonding Poin of View
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is based on a study of solid Molybdenum(II) chloride cluster compounds. The emphasis of the text is on the hydrogen network in the different compounds. The main analysis tool has been single crystal x-ray diffraction, and in some cases theoretical calculations have been performed to confirm the hydrogen positions.

It has been shown that the Mo(II) cluster is a very good promoter for hydrogen bonds. The hydrogen bond networks studied here are fairly rigid and strong, except for one compound where the easy loss of a water molecule changes the water structure dramatically.

There are several ways to alter the crystal structure and of course alter the hydrogen bond network.

Ø Change the syntheses with respect to pH

Ø Change the apical halogenides

Ø Introducing cations instead of H3O+

Ø Using protonated organic amino bases as cations and different organic solvents

All of these methods have been tested and evaluated. The general conclusion is that the cluster units are nicely ordered in the hydrogen bond network.

Place, publisher, year, edition, pages
Stockholm: Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi, 2005. 54 p.
Keyword
Molybdenum Cluster Hydrogen network
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:su:diva-491 (URN)91-7155-070-4 (ISBN)
Public defence
2005-05-26, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 8 C, Stockholm, 10:00
Opponent
Supervisors
Available from: 2005-05-04 Created: 2005-05-04Bibliographically approved

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