Pentaammines

IS further extended by the replacement of X by other anionic or neutral ligands. The inertness of the compounds makes such substitution reactions slow (taking hours or days to attain equilibrium) and, being therefore amenable to examination by conventional analytical techniques, they have provided a continuing focus for kinetic studies. The forward (aquation) and backward (anation) reactions of the pentaammines ... 

Cobalt, hexaamminetrifluoroacetato-photothermography, 6,119 Cobalt, nitropentaammine-, 1, 3 Cobalt, octacarbonyldi-exchange reactions, 1,289 Cobalt, pentaammine-electron transfer, 1, 373... 

Cobalt, p-pe roxobis(pentaammine)-cyclic voltammetry, 1, 482 Cobalt, tetraammine-structure, 1, 8... 

Rhodium, iodotetrakis(difluoro(diethylamino)-phosphine)-, 4, 924 Rhodium, pentaamminethiocyanato-base hydrolysis, 1, 504 Rhodium, pentaammincurea-linkage isomerism, 4, 961 Rhodium, pentaammine(urea)-decomposition, 1,186... 

Ruthenium, pyrazincbis(pentaammine-electron transfer, 1,360 Ruthenium, tetraamminedichloro-cyclic voltammetry, 1,483 Ruthenium, tetraamminedihalo-cyclic voltammetry, 1,482 Ruthenium, tetrachloronitrido-tetraphenylarsenate stereochemistry, 1, 44 Ruthenium, tris(acetyIacetone)-structure, 1,65... 

First, consider the base hydrolysis of pentaammine(bromo)cobalt(2+) ion, Eq. (I -27).4 The rate is directly proportional to the hydroxide ion concentration,... 

Utilizing an alternate mode of Diels-Alder reactivity, Harman has examined the cycloaddition reactions of 4,5-T -Os(II)pentaammine-3-vinylpyrrole complexes with suitably activated dienophiles <96JA7117>. For instance, cycloaddition of the p-vinylpyrrole complex 58 with 4-cyclopentene-l,3-dione, followed by DDQ oxidation affords 59, possessing the fused-ring indole skeleton of the marine cytotoxic agent, herbindole B. 

PEN polymers, 20 38, 44. See also Poly(ethylene 2,6-naphthalenedicarboxylate) (PEN) properties of, 20 70 Penta-4-tolylantimony, 3 78 Pentaammine complexes, aquation of, 13 442... 

Y. Harel, A. W. Adamson. Photocalorimetry. 4. Enthalpies of Substitution Reactions of Rhodium(III) and Iridium(lll) Pentaammine Halides and of Ruthenium(II) Hexaammine. J. Phys. Chem. 1986, 90, 6690-6693. 

Creutz-Taube ion [bis(pentaammine-ruthenium)pyrazine]D (30) provides an example of this. There is good reason to suppose (in spite of many earlier arguments to the contrary) that this is a fully delocalized mixed-valence system (27). In symmetry, the one-electron levels separated by energy gap 2J are calculated to have b u (bonding) and b (antibonding) symmetry,... 

Kinetic parameters k, often also and AS, occasionally AV ) for formation and dissociation of several pentacyanoferrate(II) complexes [Fe(CN)5L]" have been established. Ligands L include several S- and A-donor heterocycles,4-methyl- and 4-amino-pyridines, a series of alkylamines, 3- and 4-hydroxy- and 3- and 4-methoxy-pyridines, several amino acids, nicotinamide, " 4-pyridine aldoxime, 3-Me and 3-Ph sydnones, several bis-pyridine ligands,neutral, protonated, and methylated 4,4 -bipyridyl, 1,2-bis(4-pyridyl)ethane and traTO-l,2-bis0-pyridyl)ethene, pyrazine- 4,4 -bipyridyl- and bis(4-pyridyl)ethyne-pentaammine-cobalt(III), edta-ruthenium(III), and pentaammineruthenium-(II)and-(III) complexes of... 

Boldyreva EV (2001) Structural aspects of intramolecular solid-state linkage isomerization in Co(III) pentaammine nitro/nitrito complexes. Russ J Coord Chem 27 1-28... 

The structure and reactivity of the pentaammine-L and penta-cyano-L complexes show close similarities (79), although the greater lability of L in the latter ones is well recognized (3,5). 

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