title: Effects of d-orbital occupancy on the geometry of the trigonal-bipyramidal complexes [M(II)Cl3(Hdabco)(dabco)]n, where M is Mn, Co, Ni or Cu and dabco is 1,4-diazabicyclo[2.2.2]octane.
abstract: Geometric data from (1-aza-4-azoniabicyclo[2.2.2]octane-kappaN(1))(1,4-diazabicyclo[2.2.2]octane-kappaN1)trichloromanganese(II), [MnCl3(C6H13N2)(C6H12N2)] or [MnCl3(Hdabco)(dabco)] (dabco is 1,4-diazabicyclo[2.2.2]octane), and the cobalt(II) analogue, [CoCl3(C6H13N2)(C6H12N2)], have been combined with previously reported data for the Ni and Cu analogues to show that bond-length trends across the isotypal series are consistent with a high-spin trigonal-bipyramidal system. As each transition metal is positioned on a D3 site in the space group R32 (No. 155), two bond lengths fully define each trigonal-bipyramidal coordination geometry [Mn-Cl = 2.3903 (7) A and Mn-N = 2.367 (2) A, and Co-Cl = 2.3080 (8) A and Co-N = 2.269 (3) A].
authors.affiliation: School of Chemistry, Faraday Building, Sackville Street, University of Manchester, Manchester M60 1QD, England. robin.pritchard@manchester.ac.uk
authors.forename: Robin G
authors.initials: RG
authors.lastname: Pritchard
authors.forename: Majid
authors.initials: M
authors.lastname: Ali
authors.forename: Abdul
authors.initials: A
authors.lastname: Munim
authors.forename: Asma
authors.initials: A
authors.lastname: Uddin