Issue 8, 2007

Competitive interactions in carboxy-functionalized pyridinium salts: crossover from O–H⋯O to O–H⋯X–M contacts

Abstract

The solid state organization of bromide and tetrabromopalladate(II) derivatives of carboxy-functionalized pyridinium cations [C5H5N(CH2)nCOOH]+, thereafter [PYn–COOH]+ (n = 5, 15), was investigated by infrared spectroscopy, which revealed the active role of carboxy groups in defining the crystalline order. [PY5–COOH]2[PdBr4] and [PY15–COOH]2[PdBr4] were also characterized by single-crystal X-ray diffraction. [PY5–COOH]2[PdBr4] exhibits strong inter-cation O–H⋯O contacts, whereas in [PY15–COOH]2[PdBr4] lateral, hydrophobic interactions predominate, which allow interionic O–H⋯X–M contacts. In both cases, a large number of additional C–H⋯X–M and C–H⋯O interactions stabilize the crystal.

Graphical abstract: Competitive interactions in carboxy-functionalized pyridinium salts: crossover from O–H⋯O to O–H⋯X–M contacts

Supplementary files

Article information

Article type
Paper
Submitted
21 Dec 2006
Accepted
18 Apr 2007
First published
04 May 2007

CrystEngComm, 2007,9, 698-703

Competitive interactions in carboxy-functionalized pyridinium salts: crossover from O–H⋯O to O–H⋯X–M contacts

F. Neve and A. Crispini, CrystEngComm, 2007, 9, 698 DOI: 10.1039/B618696C

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