Low-dimensional compounds containing cyano groups. XII.)copper(II) perchlorate

Burčák, Milan; Potočňák, Ivan; Massa, Werner; Jäger, Lothar

doi:10.1107/s0108270105016768

Cited by 1 publication

(1 citation statement)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…, and dca is dicyanamide [11], and [Cu(tn) 2 dca]ClO 4 compounds, where tn is 1,3-diaminopropane [12]. We have found that the geometry in these compounds depends mostly on the rigidity of L. Geometry of the central atom in compounds with highly rigid phen is only slightly distorted trigonal bipyramidal, while it is more distorted trigonal bipyramidal in compounds with less rigid bipy and slightly distorted square pyramidal when L is a flexible tn ligand.…”

Section: Introductionmentioning

confidence: 99%

Low-dimensional compounds containing cyano groups. XV. Preparation, crystal structure and spectral properties of three copper(II) nitrosodicyanomethanide complexes

Potočňák

Vávra

Jäger

et al. 2007

Transition Met Chem

Self Cite

View full text Add to dashboard Cite

We describe the preparation and crystal structures of the ionic complexes [Cu(bipy) 2 {ONC(CN) 2 }] CF 3 SO 3 (1b), [Cu(phen) 2 {ONC(CN) 2 }]PF 6 (2p) and [Cu(bipy) 2 {ONC(CN) 2 }]PF 6 (2b). In the complex cations [Cu(L) 2 {ONC(CN) 2 }] + (L is 2,2 0 -bipyridine (bipy) or 1,10-phenanthroline (phen)) the two molecules of bipy or phen coordinate to the copper atom through two nitrogen atoms along with the oxygen atom of the nitrosodicyanomethanide anion, ONC(CN) 2 -, to form a {CuN 4 O} chromophore with a distorted square pyramidal coordination sphere in (1b) and (2b) and a distorted trigonal bipyramidal geometry in (2p). The basal plane in (1b) and (2b) is formed by an oxygen atom coordinated at the Cu1-O1 distance of 1.990(2) and 2.002(2) Å , respectively, and three nitrogen atoms coordinated to the copper atom at similar distances with the average of 2.01(2) and 2.00(3) Å , respectively. The axial position is occupied by the fourth N atom at the longer distance of 2.222(2) and 2.185(2) Å , respectively. The trifluoromethanesulfonate anion (triflate), CF 3 SO 3 -, in (1b) might be considered as very weakly coordinated in the opposite axial position (Cu1-O2 = 2.719(2) Å ). The equatorial plane in (2p) is formed by an oxygen atom coordinated at the Cu1-O1 distance of 1.975(3) Å , and two nitrogen atoms from different phen molecules coordinated to the copper atom at the same distance within 2 r with the average distance of 2.124(2) Å . The axial positions are occupied by the remaining two nitrogen atoms coordinated at shorter distance (average Cu-N = 1.99(3) Å ). The hexafluorophosphate anions, PF 6 -, in (2p) and (2b) remain uncoordinated. Besides the ionic forces, the structures of (2p) and (2b) may be stabilized by very weak C-HÁÁÁF whereas the structure of (1b) by very weak C-HÁÁÁF, C-HÁÁÁO and C-HÁÁÁN hydrogen bonds. The structural-spectral correlations are also discussed.

show abstract

Section: Introductionmentioning

confidence: 99%