187 Os subspectra in  1 H and  31 P{ 1 H} spectra of triosmium carbonyl clusters | Zendy

Stchedroff Marc J. | Zendy; Aime Silvio | Zendy; Gobetto Roberto | Zendy; Salassa Luca | Zendy; Nordlander Ebbe | Zendy

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187 Os subspectra in 1 H and 31 P{ 1 H} spectra of triosmium carbonyl clusters

Author(s) -

Stchedroff Marc J.,

Aime Silvio,

Gobetto Roberto,

Salassa Luca,

Nordlander Ebbe

Publication year - 2002

Publication title -

magnetic resonance in chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.483

H-Index - 72

eISSN - 1097-458X

pISSN - 0749-1581

DOI - 10.1002/mrc.962

Subject(s) - chemistry , diphosphines , spectral line , crystallography , phosphine , yield (engineering) , nmr spectra database , cluster (spacecraft) , stereochemistry , physics , biochemistry , astronomy , computer science , thermodynamics , programming language , catalysis

A survey of the use of 187 Os satellite subspectra in 1 H and 31 P{ 1 H} spectra of triosmium carbonyl clusters is reported. By varying evolution delays in HMQC spectra of [Os 3 (µ‐H) 2 (CO) 10 ] we have selectively extracted the values for 1 J (Os,H) and 2 J (Os,H), respectively. An analysis of the principal modes of phosphine coordination in triosmium clusters demonstrates that 31 P{ 1 H} 187 Os satellite subspectra are diagnostic for equatorial coordination [ 1 J (Os,P) = 211–223 Hz] or for axial coordination (perpendicular to the plane of the cluster) [ 1 J ( Os , P ) ≈ 147 Hz]. Chelating and bridging diphosphines yield 187 Os satellite subspectra which are the sum of A 2 X and AA′X spin systems. If significant P–P coupling is present, the AA′X component requires simulation. All observed 2 J (Os,P) trans ‐equatorial couplings fall in the range 38–65 Hz. Copyright © 2001 John Wiley & Sons, Ltd.

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