Diethylenetriamine complexes

Diethylenetriamine complexes of cobalt see Cobalt (III) bis (diethylenetriamine) perchlorate 3 C383... 

The direct preparation of the iodides may be accomplished in the same manner as the bromides, with the use of 5.5 ml. of reagent-grade hydriodic acid (47-50%) in place of the hydrobromic acid. The diethylenetriamine complex was found to be... 

Fig, 5.2. Possible geometrical isomers of the [Co(CN)(0,OXN)j]-type complexes 1) triammine complex, 2) ammineethylenediamine complex, and 3) diethylenetriamine complex... 

N,N, N"-Tris(trimethylsilyl)diethylenetriamine complexes of aluminum have been shown to be active oligomerization catalysts for propylene oxide. Over the course of 2 days, catalyst 6 (Figure 1) produces low-molecular-weight poly (propylene oxide) (A n<500gmor ) with predominantly head-to-tail linkages and an m-dyad content of 60%. 

Solvent Effects. Kinetic parameters for the reaction of [Pt(dien)Br]+ with 3-cyanopyridine have been determined in deuterium oxide solution, in order to make a comparison of reactivities in deuterium oxide and in ordinary water. To avoid any complications from protium-deuterium exchange between solvent and co-ordinated ligand, the perdeuterio-diethylenetriamine complex was used as substrate in deuterium oxide solvent. The kinetic parameters are compared in Table 1. The results were discussed in terms of an associative mechanism and the smaller solvating effects of D2O compared with HgO. ... 

Figure 3.33 The structure of complexes of tridentate amines such as diethylenetriamine.

Metals may also be linked through an oxygen or nitrogen atom to form a stable metal complex without a carbon-metal bond. These include metal complexes of ethylenediamine tetraacetate (EDTA), diethylenetriamine pentaacetate (DTPA), or ethylenediamine tetramethylphosphonate (EDTMP). Metalloid compounds include antimonyl gluconate and bismuth salicylate. 

Materials. Egg phosphatidylcholine (PC), bovine brain phosphatidylserine (PS) were obtained from Avanti Polar Lipids Inc. (Birmingham, AL) and cholesterol was from Sigma (St. Louis, MO). Ganglioside GMj, bovine, was obtained from Calbiochem (San Diego, CA). Diethylenetriamine pentaacetic acid distearylamide complex (DPTA-SA) was synthesized according to ref. 17 and nlIn-DTPA-SA was prepared as described (7). This lipophilic radiolabel is not transferred to the serum components from liposomes (unpublished data), nor is it rapidly metabolized in vivo (7). The synthesis of N-(glutaryl)phosphatidylethanolamine(NGPE) has been described (18). Dipalmitoyl deoxyfluorouridine(dpFUdR) was synthesized as described (24). 

Table 1.8 Consecutive stability constants, expressed as logXMX., of complexes of ammonia (A), ethylene diamine (B), diethylenetriamine (C) and the anion of ethylenediaminetetraacetic acid (D4 ) at 20°C and 0.1 mKN03 as indifferent electrolyte. (According to J. Bjerrum and G.

Tridentate amines come in a variety of forms. Diethylenetriamine (dien) (129) and its bis-trimethylene homolog ditn (130) may adopt either facial or meridional coordination modes. Furthermore, the /ao[Co(dien)2]3+ complex may exist as either the centrosymmetric meso or dissymmetric rac isomer where the secondary amines are trans or cis respectively.662 However,... 

A comprehensive series of mono- and dinuclear iodoplatinum(II) complexes [Ptl(dien)]+ and [ PtI(dien) 2(/r-CH2) ] (42) (dien = parent or substituted diethylenetriamine n = 2-9), respectively, have been synthesized as potential probes of nucleic acid structure.158 Both chiral and achiral species were prepared. In general, the complexes are synthesized by the reaction of trans-[PtI2(DMSO)2] with the dien ligand in DMF solution. 

Stepwise formation constants have been determined in the system Hg2+/Cl-/diethylenetriamine (dien) and related systems by potentiometry. Thermodynamic parameters have been calculated and the contribution of the entropy term to complex stability discussed.208... 

Singh et al. (2006) also used cycloaddition to prepare carbon nanotubes containing indium labeled diethylenetriamine pentaacetic acid (DTPA) derivatives (Figure 15.17). In the initial modification, a SWNT was derivatized to contain a primary amine at the end of a short PEG spacer. The resultant water-soluble nanotube then was reacted with DTPA to create a metal chelating group at the end of the chain. Subsequent loading of the chelate with mIn created a radionuclide-SWNT complex for in vivo biodistribution studies. 

The ligand diethylenetriamine, H2NCH2CH2NHCH2CH2NH2, forms stable complexes with Pt2+. When the complexes [Pt(dien)X]+ undergo reaction with pyridine, the rate constants for X = Cl-, I-, and N02- are 3.5 X 10-5, 1.0 X 10-s,and5.0 X 10-8 sec-1, respectively. What is the mechanism forthe substitution reactions Provide an explanation for the difference in rates of the reactions. What would be a reasonable estimate for the rate constant when X = Br- Explain your answer. 

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