31P NMR studies of redox reactions of bis (trialkylphosphine) gold(I) bromide (alkyl = methyl, ethyl) with disulphide and diselenide ligands

Waqar Ashraf; Anvarhusein A. Isab

doi:10.1080/00958970410001671228

³¹P NMR studies of redox reactions of bis (trialkylphosphine) gold(I) bromide (alkyl = methyl, ethyl) with disulphide and diselenide ligands

Waqar Ashraf, Anvarhusein A. Isab^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Redox reactions of bis (trialkylphosphine) gold(I) bromide (alkyl = methyl, ethyl) with two diselenides (R′Se-SeR′), selenocystine and selenocystamine and their corresponding disulfides were studied in D ₂O by ³¹P NMR spectroscopy. Upon interaction of diselenides with (Me₃P)₂AuBr or with (Et ₃P)₂AuBr, the Se-Se bond is broken, resulting in the formation of R₃PAu⁺, R′SeH, R′Se-Au-PR ₃, R₃PO and (AuSeR′)_n. Second-order rate constants were determined for the decomposition of (R₃P) ₂AuBr. Selenocystamine reacts with (Et₃P)₂AuBr about 100 times faster than its corresponding disulfide. However, cystamine reacts twice as fast with (Me₃P)₂AuBr compared to its corresponding diselenide.

Original language	English
Pages (from-to)	337-346
Number of pages	10
Journal	Journal of Coordination Chemistry
Volume	57
Issue number	4
DOIs	https://doi.org/10.1080/00958970410001671228
State	Published - 10 Mar 2004

Bibliographical note

Funding Information:
This research was supported by the KFUPM Research Committee under project no. SABIC/2003-08.

Keywords

Diselenide
Gold(I) thiomalate
NMR
Selenocystamine
Selenocystine

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Materials Chemistry

Access to Document

10.1080/00958970410001671228

Cite this

@article{fe815ed6c9a243cdb95b3428d0b689ea,

title = "31P NMR studies of redox reactions of bis (trialkylphosphine) gold(I) bromide (alkyl = methyl, ethyl) with disulphide and diselenide ligands",

abstract = "Redox reactions of bis (trialkylphosphine) gold(I) bromide (alkyl = methyl, ethyl) with two diselenides (R′Se-SeR′), selenocystine and selenocystamine and their corresponding disulfides were studied in D 2O by 31P NMR spectroscopy. Upon interaction of diselenides with (Me3P)2AuBr or with (Et 3P)2AuBr, the Se-Se bond is broken, resulting in the formation of R3PAu+, R′SeH, R′Se-Au-PR 3, R3PO and (AuSeR′)n. Second-order rate constants were determined for the decomposition of (R3P) 2AuBr. Selenocystamine reacts with (Et3P)2AuBr about 100 times faster than its corresponding disulfide. However, cystamine reacts twice as fast with (Me3P)2AuBr compared to its corresponding diselenide.",

keywords = "Diselenide, Gold(I) thiomalate, NMR, Selenocystamine, Selenocystine",

author = "Waqar Ashraf and Isab, \{Anvarhusein A.\}",

note = "Funding Information: This research was supported by the KFUPM Research Committee under project no. SABIC/2003-08.",

year = "2004",

month = mar,

day = "10",

doi = "10.1080/00958970410001671228",

language = "English",

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journal = "Journal of Coordination Chemistry",

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T1 - 31P NMR studies of redox reactions of bis (trialkylphosphine) gold(I) bromide (alkyl = methyl, ethyl) with disulphide and diselenide ligands

AU - Ashraf, Waqar

AU - Isab, Anvarhusein A.

N1 - Funding Information: This research was supported by the KFUPM Research Committee under project no. SABIC/2003-08.

PY - 2004/3/10

Y1 - 2004/3/10

N2 - Redox reactions of bis (trialkylphosphine) gold(I) bromide (alkyl = methyl, ethyl) with two diselenides (R′Se-SeR′), selenocystine and selenocystamine and their corresponding disulfides were studied in D 2O by 31P NMR spectroscopy. Upon interaction of diselenides with (Me3P)2AuBr or with (Et 3P)2AuBr, the Se-Se bond is broken, resulting in the formation of R3PAu+, R′SeH, R′Se-Au-PR 3, R3PO and (AuSeR′)n. Second-order rate constants were determined for the decomposition of (R3P) 2AuBr. Selenocystamine reacts with (Et3P)2AuBr about 100 times faster than its corresponding disulfide. However, cystamine reacts twice as fast with (Me3P)2AuBr compared to its corresponding diselenide.

AB - Redox reactions of bis (trialkylphosphine) gold(I) bromide (alkyl = methyl, ethyl) with two diselenides (R′Se-SeR′), selenocystine and selenocystamine and their corresponding disulfides were studied in D 2O by 31P NMR spectroscopy. Upon interaction of diselenides with (Me3P)2AuBr or with (Et 3P)2AuBr, the Se-Se bond is broken, resulting in the formation of R3PAu+, R′SeH, R′Se-Au-PR 3, R3PO and (AuSeR′)n. Second-order rate constants were determined for the decomposition of (R3P) 2AuBr. Selenocystamine reacts with (Et3P)2AuBr about 100 times faster than its corresponding disulfide. However, cystamine reacts twice as fast with (Me3P)2AuBr compared to its corresponding diselenide.

KW - Diselenide

KW - Gold(I) thiomalate

KW - NMR

KW - Selenocystamine

KW - Selenocystine

UR - https://www.scopus.com/pages/publications/2942584858

U2 - 10.1080/00958970410001671228

DO - 10.1080/00958970410001671228

M3 - Article

AN - SCOPUS:2942584858

SN - 0095-8972

VL - 57

SP - 337

EP - 346

JO - Journal of Coordination Chemistry

JF - Journal of Coordination Chemistry

IS - 4

ER -