Crystal structures and spectral properties of five-coordinate copper(II) complexes with N,N,N′,N″,N″-pentamethyldiethylenetriamine (pmdt) and α-diamines: Approximately regular trigonal bipyramidal [Cu(en)(pmdt)](ClO4)2 and highly distorted [Cu(SS-chxn(pmdt)](ClO4)2 (en  1,2-diaminoethane and SS-chxn  (1S,2S)-1,2-diaminocyclohexane)

Solution [Cu(amm)]2+ is a Strongly Solvated Square Pyramid: A Full Account of the Copper K-edge XAS Spectrum Within Single-Electron Theory

“…However, the EXAFS unfit residuals of the three fits (Figure 2, inset) contained obvious periodic intensities at lower k-values indicating that these models could not fully reproduce the EXAFS spectrum. Fits using an even more greatly axially compressed trigonal bipyramidal model (4 × Cu-N eq ) 2.04 Å; 2 × Cu-N ax ) 2.02 Å, F ) 0.1369) 29,30 produced a similar unfit residual. Therefore, all three models, trigonal [Cu(NH 3 ) 3 ] 2+ , tetragonal [Cu(NH 3 ) 4 ] 2+ , and trigonal bipyramidal [Cu(NH 3 ) 5 ] 2+ , were rejected as viable candidates for the solution structure of [Cu(amm)] 2+ .…”

Solution [Cu(amm)]2+ is a Strongly Solvated Square Pyramid: A Full Account of the Copper K-edge XAS Spectrum Within Single-Electron Theory

“…However, the EXAFS unfit residuals of the three fits (Figure 2, inset) contained obvious periodic intensities at lower k-values indicating that these models could not fully reproduce the EXAFS spectrum. Fits using an even more greatly axially compressed trigonal bipyramidal model (4 × Cu-N eq ) 2.04 Å; 2 × Cu-N ax ) 2.02 Å, F ) 0.1369) 29,30 produced a similar unfit residual. Therefore, all three models, trigonal [Cu(NH 3 ) 3 ] 2+ , tetragonal [Cu(NH 3 ) 4 ] 2+ , and trigonal bipyramidal [Cu(NH 3 ) 5 ] 2+ , were rejected as viable candidates for the solution structure of [Cu(amm)] 2+ .…”

Efficacious Alkaline Copper Corrosion Inhibition by a Mixed Ligand Copper(II) Complex of 2,2′‐Bipyridine and Glycine: Electrochemical and Theoretical Studies

“…[31][32][33][34][35][36] Applications of these methods to square planar and trigonal bipyramidal, as well as intermediate copper complexes have been reported recently. [37,38] One of the simplest methods utilizes the difference in basal angles θ and ω formed by the trans-ligands and the central metal ion. [39] These angles are 180°in an ideal square pyramid, but they are usually smaller and fall in the range of 160-170°due to displacement of the metal ion from the basal plane.…”

Solution [Cu(amm)]2+ is a Strongly Solvated Square Pyramid: A Full Account of the Copper K-edge XAS Spectrum Within Single-Electron Theory

“…However, the EXAFS unfit residuals of the three fits (Figure 2, inset) contained obvious periodic intensities at lower k-values indicating that these models could not fully reproduce the EXAFS spectrum. Fits using an even more greatly axially compressed trigonal bipyramidal model (4 × Cu-N eq ) 2.04 Å; 2 × Cu-N ax ) 2.02 Å, F ) 0.1369) 29,30 produced a similar unfit residual. Therefore, all three models, trigonal [Cu(NH 3 ) 3 ] 2+ , tetragonal [Cu(NH 3 ) 4 ] 2+ , and trigonal bipyramidal [Cu(NH 3 ) 5 ] 2+ , were rejected as viable candidates for the solution structure of [Cu(amm)] 2+ .…”

Efficacious Alkaline Copper Corrosion Inhibition by a Mixed Ligand Copper(II) Complex of 2,2′‐Bipyridine and Glycine: Electrochemical and Theoretical Studies

“…[31][32][33][34][35][36] Applications of these methods to square planar and trigonal bipyramidal, as well as intermediate copper complexes have been reported recently. [37,38] One of the simplest methods utilizes the difference in basal angles θ and ω formed by the trans-ligands and the central metal ion. [39] These angles are 180°in an ideal square pyramid, but they are usually smaller and fall in the range of 160-170°due to displacement of the metal ion from the basal plane.…”

Solution [Cu(amm)]2+ is a Strongly Solvated Square Pyramid: A Full Account of the Copper K-edge XAS Spectrum Within Single-Electron Theory

“…However, the EXAFS unfit residuals of the three fits (Figure 2, inset) contained obvious periodic intensities at lower k-values indicating that these models could not fully reproduce the EXAFS spectrum. Fits using an even more greatly axially compressed trigonal bipyramidal model (4 × Cu-N eq ) 2.04 Å; 2 × Cu-N ax ) 2.02 Å, F ) 0.1369) 29,30 produced a similar unfit residual. Therefore, all three models, trigonal [Cu(NH 3 ) 3 ] 2+ , tetragonal [Cu(NH 3 ) 4 ] 2+ , and trigonal bipyramidal [Cu(NH 3 ) 5 ] 2+ , were rejected as viable candidates for the solution structure of [Cu(amm)] 2+ .…”

Efficacious Alkaline Copper Corrosion Inhibition by a Mixed Ligand Copper(II) Complex of 2,2′‐Bipyridine and Glycine: Electrochemical and Theoretical Studies

“…[31][32][33][34][35][36] Applications of these methods to square planar and trigonal bipyramidal, as well as intermediate copper complexes have been reported recently. [37,38] One of the simplest methods utilizes the difference in basal angles θ and ω formed by the trans-ligands and the central metal ion. [39] These angles are 180°in an ideal square pyramid, but they are usually smaller and fall in the range of 160-170°due to displacement of the metal ion from the basal plane.…”