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Synthesis, spectroscopic studies and structural systematics of phosphine oxide complexes with Group II metal (beryllium-barium) nitrates

Synthesis, spectroscopic studies and structural systematics of phosphine oxide complexes with Group II metal (beryllium-barium) nitrates
Synthesis, spectroscopic studies and structural systematics of phosphine oxide complexes with Group II metal (beryllium-barium) nitrates
Complexes of the nitrates of beryllium, magnesium, calcium, strontium and barium with the phosphine oxides OPPh3, Ph2P(O) CH2P(O) Ph-2, and o-C6H4(P(O) Ph-2)(2) have been prepared and characterised by analysis and IR spectroscopy and the structures of [Be(OPPh3)(2)(NO3)(2)], [Mg(OPPh3)(2)(NO3)(2)], [Ca{Ph2P(O) CH2P(O) Ph-2}(2)(NO3)(2)] and [Ca{o-C6H4(P(O) Ph-2)(2)}(2)(NO3)(2)] have been determined. The solution speciation has been probed by a combination of H-1, P-31{H-1} and Be-9 NMR spectroscopy and conductance measurements. The variation in speciation and stability from Be - Ba is interpreted in terms of changes in the charge/radius ratio of the cations - thus whilst Be and Mg interact strongly with the phosphinoyl ligands, strontium and especially barium have very limited affinity for these ligands, and the complexes are extensively dissociated in solution.
crystal-structures
1144-0546
782-790
Davis, M. F.
87ace902-58fe-4327-8bcc-faced23eed4e
Levason, W.
e7f6d7c7-643c-49f5-8b57-0ebbe1bb52cd
Ratnani, R.
5c33e340-5b43-4fae-b43d-c37ae26100ff
Reid, G.
37d35b11-40ce-48c5-a68e-f6ce04cd4037
Webster, M.
f26c6e36-cb2e-486e-b2ed-b0d25a3a71f7
Davis, M. F.
87ace902-58fe-4327-8bcc-faced23eed4e
Levason, W.
e7f6d7c7-643c-49f5-8b57-0ebbe1bb52cd
Ratnani, R.
5c33e340-5b43-4fae-b43d-c37ae26100ff
Reid, G.
37d35b11-40ce-48c5-a68e-f6ce04cd4037
Webster, M.
f26c6e36-cb2e-486e-b2ed-b0d25a3a71f7

Davis, M. F., Levason, W., Ratnani, R., Reid, G. and Webster, M. (2006) Synthesis, spectroscopic studies and structural systematics of phosphine oxide complexes with Group II metal (beryllium-barium) nitrates. New Journal of Chemistry, 30 (5), 782-790. (doi:10.1039/b600301j).

Record type: Article

Abstract

Complexes of the nitrates of beryllium, magnesium, calcium, strontium and barium with the phosphine oxides OPPh3, Ph2P(O) CH2P(O) Ph-2, and o-C6H4(P(O) Ph-2)(2) have been prepared and characterised by analysis and IR spectroscopy and the structures of [Be(OPPh3)(2)(NO3)(2)], [Mg(OPPh3)(2)(NO3)(2)], [Ca{Ph2P(O) CH2P(O) Ph-2}(2)(NO3)(2)] and [Ca{o-C6H4(P(O) Ph-2)(2)}(2)(NO3)(2)] have been determined. The solution speciation has been probed by a combination of H-1, P-31{H-1} and Be-9 NMR spectroscopy and conductance measurements. The variation in speciation and stability from Be - Ba is interpreted in terms of changes in the charge/radius ratio of the cations - thus whilst Be and Mg interact strongly with the phosphinoyl ligands, strontium and especially barium have very limited affinity for these ligands, and the complexes are extensively dissociated in solution.

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More information

Published date: 2006
Keywords: crystal-structures

Identifiers

Local EPrints ID: 44418
URI: http://eprints.soton.ac.uk/id/eprint/44418
ISSN: 1144-0546
PURE UUID: 49cb4a7b-55e5-4b0c-9524-7fdcbfe1f557
ORCID for W. Levason: ORCID iD orcid.org/0000-0003-3540-0971
ORCID for G. Reid: ORCID iD orcid.org/0000-0001-5349-3468

Catalogue record

Date deposited: 01 Mar 2007
Last modified: 03 Dec 2019 02:07

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