A manganese(II) dichloro-bridged one-dimensional polymer: Structural, fluorescence and low-temperature magnetic study Arpi Majumder a , Matthias Westerhausen b , Alexander N. Kneifel b , Jean-Pascal Sutter c, * , Nathalie Daro c , Samiran Mitra a, * a Department of Chemistry, Jadavpur University, Raja S. C. Mallik Road, Kolkata, West Bengal 700 032, India b Institute of Inorganic and Analytical Chemistry, Friedrich-Schiller-University Jena, August-Bebel-Str. 2, D-07743 Jena, Germany c Institut de Chimie de la Matie ` re, Condense ´e de Bordeaux, UPR 9048 CNRS, 87, Ave. Dr. Schweitzer, F-33608 PESSAC, France Received 30 November 2005; received in revised form 31 March 2006; accepted 19 April 2006 Available online 11 May 2006 Abstract One-dimensional organic/inorganic composite coordination polymer has been synthesised by the reaction of manganese(II) chloride with the chelating bidentate ligand, 1,10-phenanthroline (1,10-phen). X-ray single crystal analysis shows a doubly chloride bridged 1-D polymer, [Mn(l-Cl) 2 (phen)] n (1), where manganese(II) ions possess octahedral environment. The complex is characterised by elemental analysis, different spectroscopic, electrochemical and low temperature magnetic susceptibility measurements. 1 exhibits strong fluores- cence emission band at 410 nm and can serve as potential photoactive material as indicated from the characteristic fluorescence prop- erties. Magnetic susceptibility measurements reveal a weak ferromagnetic interaction between the two high-spin Mn(II) ions of J = 0.017 cm 1 . Ó 2006 Elsevier B.V. All rights reserved. Keywords: Mn(II) complex; Doubly chloro-bridged; Crystal structure; Fluorescence; Magnetic susceptibility study 1. Introduction The polymeric compounds have received much interest and importance in recent years, owing to not only their intriguing structural motifs but also due to their potential application in catalysis, medicine, host–guest chemistry and the promising photo-, electro-, and magnetic materials [1,2]. A number of one-dimensional chain coordination polymers have been reported. But, relatively few investiga- tions of the structures and magnetic properties of halogen- bridged Mn(II) polymers have been carried out [3,4]. In addition to the magnetic interest and the application of manganese compounds in industrial catalysis [5], chlo- ride-bridged Mn(II) compounds are attractive for the study of the role of chloride anions in the assembly of manganese ions in photosynthetic water oxidation systems [2]. Dichloro-bridged complexes have been used as models to understand the electron transfer process, the excited-state acid–base properties of inorganic systems and magnetic coupling interactions. The ferromagnetic exchange interac- tions in some of these complexes exhibit a dramatic rise in magnetic moment at low temperature and have been stud- ied in detail [6]. Dichloro-bridged species have primarily been used as precursors for the preparation of monomeric ortho-metallated complexes [7]. Such compounds contain- ing cyclometallating ligands have been exploited in elec- trophosphorescent complexes that are capable of generating pure red, green and blue light, are in high demand due to their potential use as dopants in full-colour organic light-emitting displays [8]. 0020-1693/$ - see front matter Ó 2006 Elsevier B.V. All rights reserved. doi:10.1016/j.ica.2006.04.044 * Corresponding authors. Present address: Laboratoire de Chimie de Coordination du CNRS, Universite ´ Paul Sabatier, 205, route de, Narbonne, F-31077 Toulouse, France (J.-P. Sutter); Tel.: +91 33 2668 2017; fax: +91 33 2414 6414 (S. Mitra). E-mail address: smitra_2002@yahoo.com (S. Mitra). www.elsevier.com/locate/ica Inorganica Chimica Acta 359 (2006) 3841–3846