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- <meta content="Astley, T." name="eprints.creators_name" />
- <meta content="Canty, A.J." name="eprints.creators_name" />
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- <meta content="Structural, Spectroscopic and Angular-overlap Studies of
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- <meta content="The metal(II) complexes [M((pz)2(py)CH}2][NO3]2 (M = Fe, Co, Ni, Cu or Zn), where (pz)2(py)CH is the unsymmetrical tripodal nitrogen-donor ligand bis(pyrazo1-1-yl)(pyridin-2-yl)methane, have been prepared and examined by single-crystal X-ray diffraction and single-crystal electronic
- spectroscopy. The structural studies, and the application of the angular overlap model to the spectroscopic results, provide new information on the bonding characteristics of tripod ligands and a comparison of pyrazole and pyridine groups. The zinc complex crystallizes in both the monoclinic(P21/c) and triclinic (P1 bar) systems, the monoclinic complex being isomorphous with those of cobalt
- and copper. The cations are centrosymmetric, but exhibit disorder in the orientation of the pyrazole and pyridine rings, except for the copper complex which exhibits a Jahn-Teller distortion involving two Cu-N(pz) bonds which are ca. 0.038 A longer than the other Cu-N distances. Except for the copper complex, the ligands form 'bite' angles N-M-N of 83.8(2)-86.9(2), resulting in a slight trigonal distortion from octahedral geometry. The tripod ligand produces a relatively strong ligand field, consistent with the rather short metal-nitrogen bond lengths in the complexes. The pyridine group is a slightly stronger sigma donor than the pyrazole groups, with both amines acting as weak pi donors." name="eprints.abstract" />
- <meta content="1991" name="eprints.date" />
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- <meta content="Journal of the Chemical Society, Dalton Transactions" name="eprints.publication" />
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- <meta content="1 See, for example, C. C. Tang, D. Davalian, P. Huang and R. Breslow,
- J. Am. Chem. Soc., 1978,100,3918; R. S. Brown and J. Huguet, Can.
- J. Chem., 1980, 58, 889.
- 2 See, for example, S. Trofimenko, Chem. Rev., 1972, 72, 497; Prog.
- Znorg. Chem., 1986,34,115.
- 3 T. A. Hafeli and F. R. Keene, Aust. J. Chem., 1988,41,1379.
- 4 P. K. Byers, A. J. Canty, B. W. Skelton and A. H. White, J. Chem.
- SOC., Chem. Commun., 1987, 1093; P. K. Byers, A. J. Canty, B. W.
- Skelton and A. H. White, Organometallics, 1990,9, 826.
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- 1990,385,417.
- 8 International Tables for X-Ray Crystallography, eds., J. A. Ibers and
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- 1967,89,3158.
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- R. G. McDonald, M. J. Riley and M. A. Hitchman, Znorg. Chem.,
- 1988, 27, 894; R. G. McDonald and M. A. Hitchman, Znorg. Chem.,
- 1989,28,3996.
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- 30 M. A. Hitchman and J. B. Bremner, Inorg. Chim. Acta, 1978, 27,
- 31 R. J. Deeth and M. Gerloch, Inorg. Chem., 1984,23,3853.
- 32 M. Gerloch, R. F. McMeeking and M. White, J. Chem. Soc., Dalton
- Trans., 1976, 655; A. Bencini, C. Benelli, D. Gatteschi and C.
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- 1967, 23, 135; G. J. Long and P. J. Clarke, Inorg. Chem., 1978, 17,
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- 34 A. J. Canty and C. V. Lee, Organometallics, 1982,1, 1063.
- 35 P. K. Byers and A. J. Canty, J. Chem. SOC., Chem. Commun., 1988,
- 639; D. G. Brown, P. K. Byers and A. J. Canty, Organometallics,
- 1990,9, 1231." name="eprints.referencetext" />
- <meta content="Astley, T. and Canty, A.J. and Hitchman, M.A. and Rowbottom, G.L. and Skelton, B.W. and White, A.H. (1991) Structural, Spectroscopic and Angular-overlap Studies of the Nature of Metal-Ligand Bonding for Tripod Ligands. Journal of the Chemical Society, Dalton Transactions, 8 . pp. 1981-1990. ISSN 1477-9226" name="eprints.citation" />
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- <meta content="The metal(II) complexes [M((pz)2(py)CH}2][NO3]2 (M = Fe, Co, Ni, Cu or Zn), where (pz)2(py)CH is the unsymmetrical tripodal nitrogen-donor ligand bis(pyrazo1-1-yl)(pyridin-2-yl)methane, have been prepared and examined by single-crystal X-ray diffraction and single-crystal electronic
- spectroscopy. The structural studies, and the application of the angular overlap model to the spectroscopic results, provide new information on the bonding characteristics of tripod ligands and a comparison of pyrazole and pyridine groups. The zinc complex crystallizes in both the monoclinic(P21/c) and triclinic (P1 bar) systems, the monoclinic complex being isomorphous with those of cobalt
- and copper. The cations are centrosymmetric, but exhibit disorder in the orientation of the pyrazole and pyridine rings, except for the copper complex which exhibits a Jahn-Teller distortion involving two Cu-N(pz) bonds which are ca. 0.038 A longer than the other Cu-N distances. Except for the copper complex, the ligands form 'bite' angles N-M-N of 83.8(2)-86.9(2), resulting in a slight trigonal distortion from octahedral geometry. The tripod ligand produces a relatively strong ligand field, consistent with the rather short metal-nitrogen bond lengths in the complexes. The pyridine group is a slightly stronger sigma donor than the pyrazole groups, with both amines acting as weak pi donors." name="DC.description" />
- <meta content="1991" name="DC.date" />
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- <h1 class="ep_tm_pagetitle">Structural, Spectroscopic and Angular-overlap Studies of the Nature of Metal-Ligand Bonding for Tripod Ligands</h1>
- <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Astley, T.</span> and <span class="person_name">Canty, A.J.</span> and <span class="person_name">Hitchman, M.A.</span> and <span class="person_name">Rowbottom, G.L.</span> and <span class="person_name">Skelton, B.W.</span> and <span class="person_name">White, A.H.</span> (1991) <xhtml:em>Structural, Spectroscopic and Angular-overlap Studies of the Nature of Metal-Ligand Bonding for Tripod Ligands.</xhtml:em> Journal of the Chemical Society, Dalton Transactions, 8 . pp. 1981-1990. ISSN 1477-9226</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/2853/1/Dalton1991_2C_1981.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/2853/1/Dalton1991_2C_1981.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />1292Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input value="4075" name="docid" accept-charset="utf-8" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1039/DT9910001981">http://dx.doi.org/10.1039/DT9910001981</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The metal(II) complexes [M((pz)2(py)CH}2][NO3]2 (M = Fe, Co, Ni, Cu or Zn), where (pz)2(py)CH is the unsymmetrical tripodal nitrogen-donor ligand bis(pyrazo1-1-yl)(pyridin-2-yl)methane, have been prepared and examined by single-crystal X-ray diffraction and single-crystal electronic
- spectroscopy. The structural studies, and the application of the angular overlap model to the spectroscopic results, provide new information on the bonding characteristics of tripod ligands and a comparison of pyrazole and pyridine groups. The zinc complex crystallizes in both the monoclinic(P21/c) and triclinic (P1 bar) systems, the monoclinic complex being isomorphous with those of cobalt
- and copper. The cations are centrosymmetric, but exhibit disorder in the orientation of the pyrazole and pyridine rings, except for the copper complex which exhibits a Jahn-Teller distortion involving two Cu-N(pz) bonds which are ca. 0.038 A longer than the other Cu-N distances. Except for the copper complex, the ligands form 'bite' angles N-M-N of 83.8(2)-86.9(2), resulting in a slight trigonal distortion from octahedral geometry. The tripod ligand produces a relatively strong ligand field, consistent with the rather short metal-nitrogen bond lengths in the complexes. The pyridine group is a slightly stronger sigma donor than the pyrazole groups, with both amines acting as weak pi donors.</p></div><table style="margin-bottom: 1em" border="0" cellpadding="3" class="not_ep_block"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/250200.html">250000 Chemical Sciences > 250200 Inorganic Chemistry</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2853</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Prof Allan J Canty</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">14 Jan 2008 09:39</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">14 Jan 2008 09:39</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=2853;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=2853">item control page</a></p>
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