1.2- Bis ethylenediamine

Stranks has also studied the exchange between tris- and bis-ethylenediamine complexes of Co(III) and Co(II). The isotopic method was used. At low ionic strengths (CIO4 ) a rate law... 

Bis(ethylenediamine)gold(III) chloride reacts with a variety of -diketonates in aqueous base, via Schiff base condensation, to form 14-membered tetraaza 12jt macrocyclic species [78[. The parent member of the series [AuL ]" being 22 (where H2L = 5,7,12,14-tetramethy]-l,4,8,ll-tetraazacydotetradeca-4,6,ll,13-tetra-ene) (Figure 2.15). The X-ray structure shows the cation to be nearly planar. 

CijH NioOigPjPtj 2 HjO iodide, dihydrate Bis(cytidine 5 -phosphate) bis[ethylenediamine-platinum(n)], CMPEPT 38 527... 

Bis(ethylenediamine)gold(III) chloride reacts with /3-diketonates in aqueous base via Schiff base condensation to form complexes of gold(III) with a 14-membered macrocyclic tetraaza ligand such as (292).1711-1713 The X-ray structure showed the cation to be nearly planar. Delocalization of -electrons within the six-membered /3-diketonate rings was indicated by the observed pattern of C—C and C—N distances. Open-chain tetraaza ligand complexes in which condensation of only one /3-diketonate has occurred, can be isolated as intermediates in this reaction. They may be used for further condensation with a different /3-diketonate. Oxidation of this complex with trityl tetrafluoroborate introduces a double bond in position C2C3.1712,1714... 

To indicate the number of ligands of a particular type, the prefixes di, tri, tetra, and so on are used. If the name of the ligand contains one of these prefixes, the number of ligands is indicated by using the prefixes bis, tris, tetrakis, and so forth. For example, two ethylenediamine ligands would be indicated as bis(ethylenediamine) rather than diethylenediamine. 

Bhat et al. [199] used complexation with the bis(ethylenediamine) copper (II) cation as the basis of a method for estimating anionic surfactants in fresh estuarine and seawater samples. The complex is extracted into chloroform, and copper is measured spectrophotometrically in the extract using l,2(pyridyl azo)-2-naphthol. Using the same extraction system these workers were able to improve the detection limit of the method to 5 pg/1 (as linear alkyl sulfonic acid) in fresh estuarine and seawater samples. 

This is another of the very interesting contributions in Tobe s paper. Tobe has studied substitution reactions of the dichloro-bis(ethylenediamine)cobalt(III) ion in methanol, reported the preparation of the supposed solvo intermediate that would be required, and studied the rate of the chloride anion entry into this supposed solvo intermediate. He reports that the lability of methanol in this complex is insufficient to allow the complex to be an intermediate in a substitution process of the dichloro complex. Yet it is possible to obtain, in the case of the dichloro-chloride exchange, a term in the rate law for the free ion. This leads to the conclusion that, in fact, one has a genuinely unimolecular substitution process. 

Neutral. A bis(ethylenediamine) structure has been incorporated into the surfactant molecule -Ci6H33C(H)[CON(H)(CH2)2NH2]2 in older to incorporate metal ions in an LB film structure via coordination instead of ionic complexation as occurs for anionic/cationic amphiphiles (14). Also, films of n-octadecylacetoacetate containing Cu2+ have been prepared, and exposure to H2S has resulted in the formation of a copper sulfide (39). Ditetradecyl-A-[4- [6-(A, N, W -trimethyl-ethylenediamino)-hexyl]oxy]benzoyl]-L-glutamate (DTG), which also contains the ethylenediamine unit, was used to make self-assembled films containing Cd2+ (40). 

Certain other 1,3-dicarbonyl chelates were brominated with difficulty or not at all. For example, the trifluoro- and hexafluoroacetylacetonates (VI, R = CF3, R = CH3, and R = R = CF3) were not brominated under a variety of vigorous conditions. However, in the case of the chromium chelates of 1-phenyl-1,3-butanedione and dibenzoylmethane (VI, R = C( Hr), R = CH5, and R = R = C(iHr)), reaction with N-bromosuccinimide (NBS) was successful. That the electron density at the central carbon of the chelate ring is an important factor in the success or failure of these electrophilic substitutions is evident from the fact that the bis-(ethylenediamine)-2,4-pentanedionocobalt(III) cation cannot be brominated even under vigorous conditions. 

Dinitro-bis(ethylenediamine)coba t (III) nitrates, cis- and rrans- forms. Prepn and properties ate given in Ref 2. 

Examples of the preparations of ris-[Cr(CN)2(en)2]2+ salts, mono- and di-ammine- and fluoro-bis(ethylenediamine) salts are given in Schemes 39 to 46. 

Copper compds (listing) (cont d) copper azidodithiocarbonate 1 A636 copper (II) bis (ethylenediamine) bromate 3C518... 

Dinitro-bis (ethylenediamine)-cobalt (III) nitrates see Di(ethylenediamine) and derivs 5 D1231... 

It is not necessary to have three chelate rings present. The cation dichloro-bis(ethylenediamine)coball(lI() exists as two geometric isomers, cis and irans The j... 

A series of complexes of the type ML(SCN) (C104)2-, (M - Zn, Cd, or Hg x = 1 or 2) has been prepared where L is en and its tetramethyl derivative, diethylenetriamine and its pentamethyl derivative, triethylenetetramine and its hexamethyl derivative, and bis(ethylenediamine). The complexes are either monomeric with four-, five- or six-coordinate metal, or polymeric containing bridging thiocyanate the perchlorate is always ionic. The thiocyanate is generally bonded through nitrogen to zinc and cadmium (and through sulfur to mercury).181... 

The stereochemical course of anations has been examined in some systems. The deaquation and anation of cis- and tronj-[Co(en)2(H20)2]X3 (X- = Cl- or Br-) have been studied.72 When X- = Cl-, the product in each case is cw-[Co(en)2Cl2]Cl a mixture of cis and trans isomers forms when X- = Br-. The deaquation—anation of a series of compounds of the type cis-[CoN4(H20)X]Y2, where X- = Cl- or Br-, N4 is tetraammine or bis(ethylenediamine) and Y- = Cl-, Br- or N03-, has also been investigated. When X- = Y- = Cl the anation occurs with retention of configuration the trans isomer forms when X- = Y- = Br-.73... 

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