Reactions of Ph4Se4Br4 with tertiary phosphines. Structural isomerism within a series of R3PSe(Ph)Br compounds

Dalton Transactions : an International Journal of Inorganic Chemistry
Nicholas A BarnesShamsa Sarwar

Abstract

The synthesis and characterisation of Ph(4)Se(4)Br(4) (1) directly from the reaction of Ph(2)Se(2) with dibromine is reported. The solid-state structure of 1 consists of four PhSeBr units linked by weak selenium-selenium bonds [3.004(2)-3.051(2) A] into a Se(4) square, and is structurally analogous to the previously reported Ph(4)Te(4)I(4). The reactions of Ph(4)Se(4)Br(4) with a variety of tertiary phosphines have been undertaken, resulting in the formation of compounds of formula R(3)PSe(Ph)Br. X-Ray crystallographic analysis of three of the compounds reveals different structural isomers. Ph(3)PSe(Ph)Br (2) is a charge-transfer (CT) compound [Se-Br 3.0020(8) A], with an essentially linear P-Se-Br bond angle, 172.15(4) degrees and T-shaped geometry at selenium. Me(3)PSe(Ph)Br (5) also contains the selenium atom in a T-shaped geometry, consistent with a CT formulation, although the Se-Br distance of 3.327(3) A is considerably longer than observed for 2. In contrast, Cy(3)PSe(Ph)Br (6) is an ionic phosphonium salt, [Cy(3)PSePh]Br with no short Se-Br interactions. Geometry at selenium is bent, as expected for an ionic compound. These results are discussed with reference to the previously reported iodo-compounds Ph(3)PSe(Ph)I and ...Continue Reading

References

Nov 25, 2000·Angewandte Chemie·T Wirth
May 22, 1996·Inorganic Chemistry·Francesco BigoliEmanuele F. Trogu
Aug 30, 2003·Acta Crystallographica. Section B, Structural Science·Carole OuvrardChristian Laurence
May 7, 2005·Dalton Transactions : an International Journal of Inorganic Chemistry·Nicholas A BarnesRobin G Pritchard
Jun 18, 2005·Dalton Transactions : an International Journal of Inorganic Chemistry·M Carla AragoniGaetano Verani
Jul 2, 2005·The Journal of Organic Chemistry·Tsutomu KimuraShinzi Kato

❮ Previous
Next ❯

Citations

Jun 1, 2011·Journal of Molecular Modeling·Nora Beatriz OkulikEduardo A Castro
Jul 31, 2012·Inorganic Chemistry·Jonathan W DubePaul J Ragogna
Oct 22, 2010·Journal of the American Chemical Society·Scott E DenmarkWilliam R Collins
Oct 17, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Laura C ForfarChristopher A Russell
Feb 29, 2008·Dalton Transactions : an International Journal of Inorganic Chemistry·Nicholas A BarnesRobin G Pritchard
Oct 13, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Nicholas A BarnesRobin G Pritchard
Jan 16, 2009·Inorganic Chemistry·Jason L Dutton, Paul J Ragogna

❮ Previous
Next ❯

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.