Studies on Mixed Thiocyanato and Selenocyanato Complexes
| Main Authors: | S. B. SHARMA, M. K. SINGH, V. P. SINGH |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 1986
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/6271770 |
Daftar Isi:
- Department of Chemistry, M. L. K. College, Balrampur-271 201 Manuscript received 23 July 1985, revised 8 May 1986, accepted 7 June 1986 A new series of bimetallic mixed thiocyanate selenocyanate complexes, M[T](SCN)(SeCN)]2 and M[T](SCN)(SeCN)2 xL, where M= CoII, NiII or CuII ; x =2 or 4 ; L=urea (u), acetamide (actm), benzamide (bnzm), acetanilide (actn) or bromoacetanilide (Br-actn), have been prepared and characterised by the various physicochemical studies, such as elemental analysis, molar conductance, magnetic moment, infrared and electronic spectra. From these studies monomeric bridged structures for the complexes have been proposed. These structures are supported by softness calculations and Pearson's HSAB principle. Ligands prefer M(II) for coordination. Thiocyanate and selenocyanate coordinate through N-end to M(II) and S- or Se-end to Ti(I). Stability constants of the complexes which were calculated by the shifts in carbonyl stretching frequency of amide, show direct relationship with their decomposition temperatures and reciprocal relationship with the amount of shifts ( ∆ \(\vartheta\)CO). Thermogravimetric analysis shows that the ligands are decomposed earlier than thiocyanate and selenocyanate.