Iron(ii) and cobalt(ii) complexes based on anionic phenanthroline-imidazolate ligands: reversible single-crystal-to-single-crystal transformations. Issue 29 (4th July 2018)

• Record Type: Journal Article
• Authors: Abhervé, Alexandre; Benmansour, Samia; Gómez-García, Carlos José; Avarvari, Narcis
• Is Part Of: CrystEngComm. Volume 20:Issue 29(2018)
• Page Start: 4141
• Page End: 4150
• Publication Date: 2018-07-04
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c8ce00561c
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Among the series of Fe II and Co II complexes based on phenanthroline-imidazolate ligands, the Fe II complex (H9 O4 )[Fe(PIMP)3 ]·(C4 H10 O)2 (H2 O) (1a ) exhibits reversible single-crystal-to-single-crystal transformations by solvent uptake/release. Abstract : A series of low-spin Fe II and Co II complexes based on phenanthroline-imidazolate (PIMP) ligands are reported. The Fe II complex (H9 O4 )[Fe(PIMP)3 ]·(C4 H10 O)2 (H2 O) (1a ) shows reversible crystalline phase transformations to afford two new phases (H9 O4 )[Fe(PIMP)3 ]·(H2 O) (1b ) and (H9 O4 )[Fe(PIMP)3 ]·(C8 H18 O)(C4 H10 O)(H2 O) (1c ) by release of diethyl ether and absorption of diethyl/dibutyl ether, respectively. This reversible uptake/release of solvent molecules is a clear example of single-crystal-to-single-crystal transformation involving a discrete metal complex. On the other hand, the corresponding Co II complex (H9 O4 )[Co(PIMP)3 ]·(C4 H10 O)2 (H2 O)2 (2 ) does not exhibit similar phase transformations. In the neutral complexes [Fe(H-TfPIMP)(TfPIMP)2 ]·(EtOH)4 (H2 O)7 (3 ) and [Co(H-TfPIMP)(TfPIMP)2 ]·(EtOH)2 (H2 O)2 (4 ), which crystallized in the polar space group Pna 21 and in the centrosymmetric space group P 21 / n, respectively, one of the imidazole ligands was not deprotonated.