1H and 13C NMR spectral studies on dicyclopentadiene complexes of rhodium(I) containing N-heterocycles
IR@NISCAIR: CSIR-NISCAIR, New Delhi - ONLINE PERIODICALS REPOSITORY (NOPR)
View Archive Info| Field | Value | |
| Title |
1H and 13C NMR spectral studies on dicyclopentadiene complexes of rhodium(I) containing N-heterocycles
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| Creator |
Ramaswamy, Y S
Gowda, N M N Reddy, G K N |
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| Description |
11-17
The bridge cleavage reaction of [Rh(μ-CI)(DCPD)]<sub>2</sub> (DCPD = <em>endo</em>-dicyclopentadiene) with <em>exo-</em>bidentate N-he-terocycles (N - N) yields binuclear complexes of the type [{RhCl(DCPD)<sub>2</sub>(μ-N-N)] [where N-N =pyrazine(pyz), 4,4'-bipyridyl(bpy) or <em>trans</em>-1,2-bis(4-pyridyl)ethylene(bpel)]. The <sup>1</sup>H NMR spectral assignments of DCPD and [Rh(μ -Cl)(DCPD)]<sub>2</sub> have been unequivocally confirmed by two-dimensional NMR spectroscopy. The stereochemical aspects of the latter are reflected in selective homonuclear <sup>1</sup>H{<sup>1</sup>H} nuclear overhauser enhancement studies. The N-N bridged structure for the complexes [{RhCl(DCPD}]<sub>2</sub> (μ-N-N)] has been proposed based on the recurrence of spectral features of their precursor in addition to those of the uncoordinated N-heterocycles. The synergistic effect in the metal-olefin bonding in these complexes in manifested in the upfield shifts of olefinic proton and carbon resonances as compared with those of free DCPD. The complexes, [{RhCl(DCPD)}<sub>2</sub>(μ -N-N)] undergo facile substitution of DCPD with carbon monoxide to afford carbonyl complexes retaining the [Rh(μ -N-N)Rh] unit. |
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| Date |
2019-03-20T07:35:42Z
2019-03-20T07:35:42Z 1990-01 |
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| Type |
Article
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| Identifier |
0975-0975(Online); 0376-4710(Print)
http://nopr.niscair.res.in/handle/123456789/46268 |
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| Language |
en_US
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| Rights |
<img src='http://nopr.niscair.res.in/image/cc-license-sml.png'> <a href='http://creativecommons.org/licenses/by-nc-nd/2.5/in' target='_blank'>CC Attribution-Noncommercial-No Derivative Works 2.5 India</a>
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| Publisher |
NISCAIR-CSIR, India
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| Source |
IJC-A Vol.29A(01) [January 1990]
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