Ligand field properties of the peptide nitrogen: The sharp-line electronic spectrum of mer-di(3-aminopropyl)amine(glycylglycinato-O,N,N′)-chromium(III)
作者:Jong-Ha Choi、Patrick E. Hoggard
DOI:10.1016/s0277-5387(00)83531-7
日期:1992.1
Angular Overlap Model calculation was used to fit the electronic spectrum, particularly the sharp-line positions, of [Cr(dpt)(glygly)]ClO 4 ·0.5C 4 H 6 N 2 O 2 ·2.5H 2 O [dpt = di(3-aminopropyl)amine, H 2 glygly = glycylglycine] at 77 K. An e π value of 502 cm −1 for the peptide nitrogen indicates that it is a weak net π-donor to chromium(III), presumably because donation from the filled π-orbital and back-donation
摘要利用角重叠模型计算拟合了[Cr(dpt)(glygly)] ClO 4·0.5C 4 H 6 N 2 O 2·2.5H 2 O [dpt]的电子光谱,特别是尖线位置。 =二(3-氨基丙基)胺,H 2甘氨酸=甘氨酰甘氨酸]在77K。肽氮的eπ值为502 cm -1,表明它是铬(III)的弱净π供体,可能是因为从填充的π轨道和反向捐赠到空的π反键轨道的捐赠几乎是平衡的。
Structure and spectroscopic properties of [di(3-aminopropyl)amine-N,N′,N″][iminodiacetato-N,O,O′]chromium(III) perchlorate
作者:Vaseetha Subramaniam、Kyu-Wang Lee、Patrick E. Hoggard
DOI:10.1016/0020-1693(93)03722-m
日期:1994.2
The mixed-ligand complex [Cr(dpt)(ida)]ClO4.2H2O (dpt = di(3-aminopropyl)amine, H-2ida = iminodiacetic acid) adopts a structure in which the ligands are tridentate and coordinate facially, with the imino nitrogen trans to the dpt secondary amine. Thus the preference of iminodiacetate for facial coordination prevails over the preference of di(3-aminopropyl)amine for meridional coordination. The crystal structure of the title complex has been determined: space group Pbca; a = 17.609(2), b = 14.762(2), c = 14.423(2) angstrom, Z = 2. An analysis of the 4A2g --> 2E(g), 2T1g} electronic spectrum shows the iminodiacetate carboxylate groups to be moderately strong sigma- and pi-donors.
Spectroscopic and ligand-field properties of [l-prolylglycinato][di(3-aminopropyl)amine]chromium(III) perchlorate
作者:Jong-Ha Choi、Yong Pyo Hong、Yu Chul Park
DOI:10.1016/s1386-1425(01)00611-4
日期:2002.6
The mixed ligand complex [Cr(L-progly)(dpt)]ClO4 [H(2)progly = prolylglycine, dpt = di(3-aminopropyl)amine] has been prepared. and its geometric structure was discussed on the basis of electronic absorption and IR spectral data. The emission and excitation spectra taken at 77 K were also reported. The 12 electronic bands due to spin-allowed and spin-forbidden transitions were assigned. Using the electronic transitions, a ligand-field optimization has been performed to determine the metal-ligand bonding properties for the coordinated atoms. We confirmed that the peptide nitrogen of prolylglycinate has moderate strong sigma- and weak pi-donor properties toward chromium(III) ion. (C) 2002 Elsevier Science B.V. All rights reserved.