Structural isomerism: linkage isomerism
المؤلف:
CATHERINE E. HOUSECROFT AND ALAN G. SHARPE
المصدر:
INORGANIC CHEMISTRY
الجزء والصفحة:
2th ed p 549
27-2-2017
1083
Structural isomerism: linkage isomerism
Linkage isomers may arise when one or more of the ligands can coordinate to the metal ion in more than one way, e.g. in [SCN]- (1.1), both the N and S atoms are potential donor sites.
(1.1)
Thus, the complex [Co(NH3)5(NCS)]2+ has two isomers which are distinguished by using the following nomenclature:
- in [Co(NH3)5(NCS-N)]2+, the thiocyanate ligand coordinates through the nitrogen donor atom;
- in [CoNH35NCS-S]2+, the thiocyanate ion is bonded to the metal centre through the sulfur atom. Scheme 1.1 shows how linkage isomers of [CoNH35NO2]2+ can be prepared.
(1.1)
In this example, the complexes [Co(NH3)5(NO2-O)]2+ and [Co(NH3)5(NO2-N)]2+ can be distinguished by using IR spectroscopy. For the O-bonded ligand, characteristic absorption bands at 1065 and 1470 cm-1 are observed, while for the N-bonded ligand, the corresponding vibrational wavenumbers are 1310 and 1430 cm-1.
الاكثر قراءة في كيمياء العناصر الانتقالية ومركباتها المعقدة
اخر الاخبار
اخبار العتبة العباسية المقدسة
