Kinetics of the anation of diaquobis(ethylenediamine)cobalt(III) by oxalic acid in aqueous acidic solution. Pressure and medium effects

Preparation, characterization, and properties of platinum(0) complexes with tri-n-butyl phosphite, tri-n-butylarsine, and tri-n-butylstibine

“…It is interesting to note that the order also follows a decreasing steric requirement of the ligand L, which agrees well with previous observations. 16 The assignment of the carbon atoms of the ligand in the 13C NMR spectra of these compounds (Table I) has been based on the data available for P-m-Bu3 complexes.17 The Ca carbons of the As-«-Bu3 and Sb-n-Bu3 ligands show only a small unresolved 2JPtC coupling, a probable consequence of the quadrupolar nuclei.…”

The Anation by Oxalate and Isomerization of cis- and trans-[Co(en)2(OH2)OH]2+

“…The anation of cis-and trans-[Co(en) 2 (OH 2 )OH] 2+ by C 2 O 4 2-1-3 is much faster than the anation of cis-[Co(en) 2 -(OH 2 ) 2 ] 3+ by HC 2 O 4or H 2 C 2 O 4 . [4][5][6][7][8] The changes in reactivity parallel changes in the rates of water exchange, with [Co(en) 2 -(OH 2 )OH] 2+ reacting almost 10 3 times faster than [Co(en) 2 -(OH 2 ) 2 ] 3+ or [Co(en) 2 (OH) 2 ] + . [9][10][11] The three previous reports [1][2][3] on the anation of [Co(en) 2 (OH 2 )OH] 2+ by C 2 O 4 2have interpreted spectrophotometric rate data in terms of the simple ionpairing mechanism with K IP ) 5.8 M -1 and k ) 8.2 × 10 -4 s -1 at 25 °C (I ) 0.37 M).…”