Structure of trans-amminebis(ethylenediamine)fluorochromium(III) perchlorate, [CrF(NH3)(C2H8N2)2](ClO4)2

Beveridge, K. A.; Bushnell, Gordon W.; Kirk, A. D.

doi:10.1107/s0108270185005923

Cited by 10 publications

(4 citation statements)

References 4 publications

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“…The Cr--N ligand distance is 2.055(4)A which is normal, agreeing with many literature values, e.g. trans-dicyano(1,4,8,11-tetraazacyclotetradecane)chromium(III) perchlorate (Hemmings, Lisgarten, Palmer & Gazi, 1990), trans-amminebis(ethylenediamine)fluorochromium(III) perchlorate (Beveridge, Bushnell & Kirk, 1985) and di-/z-methoxo-bis- [7-amino-4-methyl-5-azahept-3-en-2-onato-O,N,N')-aquachromium(III)] diperchlorate (Clegg, 1985). The Br--Cr--Br' and N(2)--Cr--N(2"') angles are exactly linear, due to symmetry requirements.…”

Section: (3) C(i')--c(i)--n(2) 107-6 (8) C(3)--n(2)--cr(1) 117-5 (4) supporting

confidence: 75%

Structures of chromium(III) cyclam complexes. 2. Structure of trans-dibromo(1,4,8,11-tetraazacyclotetradecane)chromium(III) bromide

Dealwis¹,

Janes²,

Palmer³

et al. 1990

Acta Crystallogr C

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Abstract. [CrBr2(Ct0H24Na)]Br, Mr = 492.0, tetragonal, P42/m, a= 7.860 (1), c= 13.507 (2) A, V= 834"5 (3) A 3, Z = 2, Dx = 1"96 g cm -3, A(Cu Ka) = 1-54184/~, /z = 119.4cm -1, F(000) =483.96, room temperature, R = 0.0722 for 637 observed reflections. The cyclam moiety exists in a chair conformation with exact 2/m symmetry. The twofold axis passes through Cr and bisects the C(1)---C(I') and C(I")--C(I'") bonds of the five-membered chelate * To whom correspondence should be addressed.0108-2701/90/030396-04503.00rings; the mirror plane also passes through Cr and contains atoms C(4) and C(4') of the cyclam moiety. The Br.-.Br' vector is tilted by 2.4 ° from the perpendicular to the CrN4 plane. Zaleski (1904) and Taylor (1940), for example.Increasing interest has been shown recently in the chromium complexes of cyclic ligands. Although several workers have prepared and studied transdibromo complexes of Ru, Co, Cu and Cr with 5,6,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane, preparation of the corresponding transdibromo cyclam complex is not known. The title complex has now been prepared in the pure form and crystallized. It is particularly interesting because components of all three spin-forbidden electronic transitions have been located and assigned (Gazi, 1988).Experimental. Crystals of the title compound were grown from a saturated green solution that was slowly evaporated over sodium hydroxide. Brightgreen square platy crystal 0.30 >< 0.30 × 0.14 mm used for data collection, preliminary Weissenberg photographs yielded approximate cell dimensions and showed tetragonal (4/m) Laue symmetry. Space group P42 or P4Jm indicated from systematic absences (00l: l = 2n + 1); P42/m confirmed by structure analysis.Enraf-Nonius CAD-4 diffractometer; 25 highangle reflections (20°< 0<40 ° ) used to obtain accurate cell dimensions by least-squares fit. at--20 scan width (0-90 + 0.14 tan0) ° in w, vertical aperture 6 mm. 4992 reflections measured (-6 < h ___ 6, 0 _ k _8, -15_3~r(/) with Rint=0"039. The structure was solved by Patterson and difference Fourier methods. The pyramidal nitrogen H atoms were positioned unambiguously by refinement of an isotropic thermal parameter for each of the geometrically positioned alternative tetrahedral sites, defined with respect to the C--N--C moiety, Cr being at too great a distance to be considered by the program for the purposes of this calculation. The incorrect alternative site acquires an unacceptably high value for this at z = ~generates ...

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Section: (3) C(i')--c(i)--n(2) 107-6 (8) C(3)--n(2)--cr(1) 117-5 (4) supporting

confidence: 75%

Structures of chromium(III) cyclam complexes. 2. Structure of trans-dibromo(1,4,8,11-tetraazacyclotetradecane)chromium(III) bromide

Dealwis¹,

Janes²,

Palmer³

et al. 1990

Acta Crystallogr C

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“…~@~n~, *k" " The mean Cr--N ligand distance of 2.084 (2)/~ is consistent with many literature values, e.g. for trans-dibromo (1,4,8,11 -tetraazacyclotetradecane)chromium(III) bromide , trans-amminebis(ethylenediamine)fluorochromium(III) perchlorate (Beveridge, Bushnell & Kirk, 1985), aquadi-/z-methoxy-bis [(7-amino-4-meth yl-5-azahept-3-en-2-onato-O,N (Clegg, 1985). The equatorial nitrogen ligands and the central chromium ion are exactly coplanar.…”

Section: Introductionsupporting

confidence: 71%

Structures of chromium(III) cyclam complexes. 5. Structure of trans-dichloro(1,4,8,11-tetraazacyclotetradecane)chromium(III) isothiocyanate

Bouckaert¹,

Maes²,

Lisgarten³

et al. 1993

Acta Crystallogr C

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“…Both cis-and trans-[Cr(en) 2 F 2 ] + and [Cr(en)F 4 ] À have subsequently been isolated with a wide range of counter ions, and X-ray crystal structures and detailed spectroscopic data reported. [150][151][152][153][154][155][156][157][158][159] Similar complexes have been prepared with other diamines including 1,2-and 1,3-diaminopropane and 1,2-diaminocyclohexane. 157,[160][161][162][163][164][165] Very detailed studies of their absorption and emission spectra, including the effects of temperature and pressure, have been carried out (see for example ref.…”

Section: Groupmentioning

confidence: 69%

Medium and high oxidation state metal/non-metal fluoride and oxide–fluoride complexes with neutral donor ligands

2013

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While most high and medium oxidation state (O.S. ≥ 3) metal and non-metal fluorides and oxide fluorides are strong Lewis acids, exploration of their coordination chemistry with neutral ligands has been limited and mostly non-systematic. This is despite the very different properties conferred on the acceptor centre by the small electronegative fluoride ligands compared to the heavier halides. This article sets out these key differences, discusses possible synthetic routes, the key characterisation techniques, and appropriate bonding models. Current knowledge of the coordination chemistry of d, f and p-block fluorides and oxide fluorides with neutral ligands (with donor atoms drawn from Groups 15 and 16 and including N-heterocyclic carbenes) is then presented and discussed, and the differences in properties compared to complexes containing the heavier halides are illustrated. The emphasis is on work published post 1990, but earlier work is also included as essential background and where no more recent information exists. Attention is drawn to unexplored areas meriting investigation and to possible applications of these complexes.

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Structure of trans-amminebis(ethylenediamine)fluorochromium(III) perchlorate, [CrF(NH3)(C2H8N2)2](ClO4)2

Cited by 10 publications

References 4 publications

Structures of chromium(III) cyclam complexes. 2. Structure of trans-dibromo(1,4,8,11-tetraazacyclotetradecane)chromium(III) bromide

Structures of chromium(III) cyclam complexes. 2. Structure of trans-dibromo(1,4,8,11-tetraazacyclotetradecane)chromium(III) bromide

Structures of chromium(III) cyclam complexes. 5. Structure of trans-dichloro(1,4,8,11-tetraazacyclotetradecane)chromium(III) isothiocyanate

Medium and high oxidation state metal/non-metal fluoride and oxide–fluoride complexes with neutral donor ligands

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