Issue 41, 2013

Modular construction of 3D coordination frameworks incorporating SiF62− links: Accessing the significance of [M(pyrazole)4{SiF6}] synthon

Abstract

Rational combination of Cd2+ cations, bitopic pyrazole ligands, bridging SiF62− and terminal NCS anions provide generation of 3D frameworks and precise control over connectedness of the net nodes: two-fold interpenetrated 4-connected NbO-like net (nbo) in [Cd(Me4bpz)2{NCS}2]·⅔CH2Cl2 (1), uninodal 5-connected noz framework in [Cd2(Me4bpz)4{SiF6}{NCS}2]·6CHCl3 (2), novel 5-connected binodal topology (with a point symbol of {42.55.62.7}{42.56.62}) in [Cd2(Me4bpz)4{SiF6}{NCS}2]·2CH2Cl2 (3) and 6-connected α-Po cubic nets (pcu) in [Cd(Me4bpz)2{SiF6}]·6H2O (4) and [Cd(Me4bpz)2{SiF6}]·1.5CH2Cl2 (5) (Me4bpz = 3,3′,5,5′-tetramethyl-4,4′-bipyrazole). Hexafluorosilicate anions act as bridges between Cd ions yielding further linkage of 4-connected [Cd(Me4bpz)2] subtopologies. Characteristic and specific interaction between SiF62− and the metal–organic portion is conditioned by a synergy of coordination and multiple strong NH⋯F bonds, which suggests perfect compatibility of the bipyrazole and SiF62− linkers for the construction of 3D structures, either by pillaring of 2D layers or cross-linking of 3D frameworks. Two observed motifs, 1D [M(pyrazole)4{μ-SiF6}]n (in 4 and 5) and discrete [{M{NCS}(pyrazole)4}2{μ-SiF6}] (in 2 and 3) are discussed as special supramolecular synthons for the framework solids. An improved large-scale and cost-effective procedure for the synthesis of the organic ligand Me4bpz is also described.

Graphical abstract: Modular construction of 3D coordination frameworks incorporating SiF62− links: Accessing the significance of [M(pyrazole)4{SiF6}] synthon

Supplementary files

Article information

Article type
Paper
Submitted
27 Jun 2013
Accepted
13 Aug 2013
First published
14 Aug 2013

CrystEngComm, 2013,15, 8280-8287

Modular construction of 3D coordination frameworks incorporating SiF62− links: Accessing the significance of [M(pyrazole)4{SiF6}] synthon

V. V. Ponomarova, V. V. Komarchuk, I. Boldog, H. Krautscheid and K. V. Domasevitch, CrystEngComm, 2013, 15, 8280 DOI: 10.1039/C3CE41238E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements