Synthesis and multinuclear NMR studies of (M(o-C sub 6 H sub 4 (TeMe) sub 2 )X sub 2 ) (M = Pd, Pt; X = Cl, Br, I). The presence of a characteristic ring contribution to sup 125 Te NMR chemical shifts

Journal Article · Tue Feb 20 23:00:00 EST 1990 · Inorganic Chemistry; (USA)

DOI:https://doi.org/10.1021/ic00329a032· OSTI ID:6944971

Kemmitt, T; Levason, W ^[1]

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1. The University, Southampton (England)

The complexes (M(o-C{sub 6}H{sub 4}(TeMe){sub 2})X{sub 2}) (M = Pd, Pt; X = Cl, Br, I) and (N{sup n}Bu{sub 4})(Ir(o-C{sub 6}H{sub 4}(TeMe){sub 2})X{sub 4}) (X = Cl, Br) have been prepared, and characterized by analysis and uv-visible, ir, and multinuclear ({sup 1}H, {sup 195}Pt({sup 1}H), {sup 125}Te({sup 1}H))NMR spectroscopy. Two isomers, meso and dl invertomers, are present in each complex. The coordination shifts in the {sup 125}Te NMR spectra of the Pd and Pt complexes are compared with those reported for (M(PhTe(CH{sub 2}){sub 3}TePh)X{sub 2}) and for the analogous cis-(M(TeMePh){sub 2}x{sub 2}). It is found that, compared with the monodentate complexes, the chelate complexes having five-membered rings exhibit large high frequency coordination shifts and those having six-membered rings have small low frequency shifts. Data on complexes of o-C{sub 6}H{sub 4}(TePh){sub 2} and MeTe(CH{sub 2}){sub 3}TeMe compared with data for TePh{sub 2} and TeMe{sub 2} complexes show similar effects, which are rationalized in terms of a characteristic chelate ring contribution, defined as {Delta}{sub R}, to the shifts of the bidentate telluroethers. Similar phenomena are known for {sup 31}P and {sup 77}Se shifts in analogous complexes, but this is the first demonstration of the effect in {sup 125}Te NMR. 21 refs., 3 figs., 4 tabs.

• OSTI ID: 6944971
• Journal Information: Inorganic Chemistry; (USA), Journal Name: Inorganic Chemistry; (USA) Vol. 29:4; ISSN 0020-1669; ISSN INOCA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
AROMATICS
CHELATES
CHEMICAL SHIFT
COMPLEXES
DATA
EXPERIMENTAL DATA
INFORMATION
NMR SPECTRA
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
PALLADIUM COMPLEXES
PLATINUM COMPLEXES
SPECTRA
SYNTHESIS
TELLURIUM COMPLEXES
TRANSITION ELEMENT COMPLEXES