Silver complexation by metallacryptates. Issue 1 (25th November 2015)

• Record Type: Journal Article
• Authors: Lamberts, Kevin; Tegoni, Matteo; Jiang, Xiang; Kou, Hui-Zhong; Englert, Ulli
• Is Part Of: Dalton transactions. Volume 45:Issue 1(2016)
• Page Start: 284
• Page End: 295
• Publication Date: 2015-11-25
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c5dt03749b
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : We report the first complete characterization of metallycryptates encapsulating Ag(i ) cations: carboxylato ligands derived froml -proline andl -alanine chelate and bridge six Cu(ii ) centres arranged in a slightly distorted octahedral fashion. Abstract : We report the first complete characterization of metallycryptates encapsulating Ag(i ) cations: carboxylato ligands derived froml -proline andl -alanine chelate and bridge six Cu(ii ) centres arranged in a slightly distorted octahedral fashion. Eight oxygen atoms of these ligands are disposed in square-prismatic geometry and coordinate the monovalent cation. Two alternative metallacryptates based on alanine have been identified which differ with respect to aggregation: a solid in which pairs of encapsulating sites are formed competes with an infinite chain of M(i ) coordinating sites. In contrast, the individual encrypting moieties are arranged as overall neutral and isolated molecular species in the proline-based metallacryptate. This proline derivative can accomodate Ag(i ) and Na(i ) cations and form a solid solution. Susceptibility measurements confirm ferromagnetic interactions between the Cu(ii ) within the hexanuclear proline cryptate and thus underline the similarity between solids accommodating Na(i ) and Ag(i ). Spectroscopic results suggest that these metallacryptates hardly dissociate in methanol solution.