The State of Cu2+ Ions in Concentrated Aqueous Ammonia Solutions of Copper Nitrate
Научная публикация
| Общее |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Переводная
|
| Журнал |
Russian Journal of Inorganic Chemistry
ISSN: 0036-0236
, E-ISSN: 1531-8613
|
| Вых. Данные |
Год: 2012,
Том: 57,
Номер: 9,
Страницы: 1285-1290
Страниц
: 6
DOI:
10.1134/S0036023612090033
|
| Авторы |
Anufrienko V.F.
1
,
Shutilov R.A.
1
,
Zenkovets G.A.
1
,
Gavrilov V.Yu.
1
,
Vasenin N.T.
1
,
Shubin A.A.
1
,
Larina T.V.
1
,
Zhuzhgov A.V.
1
,
Ismagilov Z.R.
1
,
Parmon V.N.
1
|
| Организации |
| 1 |
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences,
pr. Akademika Lavrent’eva 5, Novosibirsk, 630090 Russia
|
|
Stabilization of Cu2+ ions in concentrated aqueous ammonia solutions of copper nitrate in a wide range of ammonium ion concentrations has been studied by EPR and electronic absorption spectroscopy. Three types of Cu2+ associates with different types of orbital ordering have been identified. The ammonium ion concentration in a solution has a decisive effect on the type of orbital ordering of Cu2+ ions in associates. In all cases, Cu2+ ordering in associates is caused by the existence of bridging OH groups in the axial and equatorial positions of [Cu(NH3) n (H2O)6 − n ]2+ complexes (n < 6). At a high concentration of ammonium ions, weakly bound associates of tetramminecopper with the dx2−y2 ground state are formed. In solutions with low ammonium concentrations, bulky associates with the dy2 and dx2−z2 ground states and associates of Cu2+ ions with the dx2−y2 ground state with hydroxyl groups in the equatorial plane and axial water molecules are formed.