mer-Trichloro(2,2′,2′′-terpyridine)chromium(III) dimethyl sulfoxide solvate

Abstract

The title compound, mer‐[CrCl3(C15H11N3)]·(CH3)2SO, adopts a distorted octa­hedral configuration about the CrIII atom.

(Acetylacetonato)aqua(2,2′,2′′-terpyridine)chromium(III) bis(perchlorate) dihydrate hexamethylphosphoramide solvate

“…The mean Cr-N(peripheral) distance of 2.062 (1) Å is slightly longer than the Cr-N(central) bond distance (1.998 (1) Å). This difference of approximately 0.08 Å has also been observed in mer-[Cr(terpy) 2 ] 3+ (Wickramasinghe et al, 1982) and in the metallo-mono(terpy) complexes mer-[CrCl 3 (terpy)] (Cloete et al, 2007), [mer-[GaCl 2 (terpy)] (0.078 Å) (Beran et al, 1970), mer-[ZnCl 2 (terpy)] (0.12 Å) (Einstein et al, 1966) and mer-[(CH 3 ) 2 SnCl(terpy)] + (0.08 Å) (Einstein et al, 1968). The C-C bond distances for the acac ligand range between 1.384 (2) and 1.496 Å.…”

“…The other bonds in complex (I) fall within the same range as the corresponding complexes (Beran et al, 1970;Cloete et al, 2007;Einstein et al, 1966;Einstein et al, 1968;Liu & Verkade, 1998;Shiren &Tanaka, 2002 andVisser et al, 2005).…”

“…Data collection: APEX2 (Bruker, 2005); cell refinement: SAINT-Plus (Bruker, 2004); data reduction: SAINT-Plus and XPREP (Bruker, 2004); program(s) used to solve structure: SIR97 (Altomare et al, 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: DIAMOND (Brandenburg & Putz, 2005); software used to prepare material for publication: WinGX (Farrugia, 1999). The Cr-atom in (I) adopts a distorted octahedral geometry where the mean intraligand N-Cr-N bond angle is 78.4 (1)°, similar to bond angles in mer-[CrCl 3 (terpy)] (Cloete et al, 2007). The rigidity of the terpyridyl group necessatates the above mentioned bite angles to be much smaller than 90°.…”

“…For similar complexes, see: Beran et al (1970); Cloete et al (2007); Einstein & Penfold (1966, 1968; Liu & Verkade (1998); Morosin (1965); Shiren & Tanaka (2002); Visser et al (2005); Wickramasinghe et al (1982). For the synthesis of the starting complex mer-[CrCl 3 (terpy)], see: Cloete et al (2007).…”

The surprising lability of bis(2,2′:6′,2′′-terpyridine)chromium(iii) complexes

“…16 We have found that [Cr(tpy) 2 ][PF 6 ] 3 can be conveniently prepared by the strategy shown in Scheme 2, and this method is easily adapted to prepare heteroleptic chromium(III) complexes. The precursor [Cr(tpy)Cl 3 ] was prepared by a modification of the method of Broomhead et al; 35,36 a similar method has been used to prepare [Cr(4′-(2-py)tpy)Cl 3 ] (4′-(2-py)tpy = 4′-(2-pyridyl)-2,2′:6′,2″-terpyridine). 37 16 and the appearance of the spectrum of [Cr(tpy)(4′-(4-tolyl)tpy)]-[PF 6 ] 3 between 300 and 380 nm is similar to that reported for [Cr(4′-(4-tolyl)tpy) 2 ] 3+ .…”