Jump to main content
Jump to site search

Issue 11, 2010
Previous Article Next Article

Metalla-macro-tricyclic cryptands: anion encapsulation and selective separation of sulfate via in situ crystallization

Author affiliations

Abstract

A conformationally flexible bis-pyridyl-bis-amide ligand, namely N,N′-bis-(3-pyridyl)isophthalamide (L1), has been exploited to synthesize metalla-macro-tricyclic cryptands by reacting it with various Cu(II) salts having different counteranions. Out of the five coordination compounds, namely [{Cu(μ-L1)2(H2O)2}·SO4·2H2O·X] (1a), [{Cu(μ-L1)(H2O)4}·SO4·3H2O] (1b), [{Cu(μ-L1)2(H2O)2}·SiF6·CH3OH·4H2O] (2), [{Cu(μ-L1)2(μ-Cl)}·ClO4] (3) and [{Cu(μ-L1)2(H2O)}·(NO3)2·2H2O·X] (4a) (X = disordered solvents), compounds such as 1a, 2 and 3 are metallacryptands, of which 3 is the first example of a polymeric metalla-macro-tricyclic cryptand. The effect of the conformation-dependent ligating topology and hydrogen bonding backbone of ligand L1, and counteranions on the formation of metallacryptands is discussed. Interestingly, an important anion, namely SO42−, has been separated by concomitantly crystallizing 1a and 1b from a complex mixture of anions, such as SO42−, NO3 and ClO4, by following an in situ crystallization technique. Magnetic interactions in 3 have been investigated as a typical example. Weak antiferromagnetic coupling is observed in 3, as expected given the topology of the networks.

Graphical abstract: Metalla-macro-tricyclic cryptands: anion encapsulation and selective separation of sulfate via in situ crystallization

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 12 Oct 2009, accepted on 18 Jun 2010 and first published on 25 Aug 2010


Article type: Paper
DOI: 10.1039/B9NJ00556K
Citation: New J. Chem., 2010,34, 2458-2469
  •   Request permissions

    Metalla-macro-tricyclic cryptands: anion encapsulation and selective separation of sulfate via in situ crystallization

    N. N. Adarsh, D. A. Tocher, J. Ribas and P. Dastidar, New J. Chem., 2010, 34, 2458
    DOI: 10.1039/B9NJ00556K

Search articles by author