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Structural Characterization and Magnetic Behaviour of the Ferro‐Antiferromagnetic Alternating Manganese–Azido Chain [Mn(3‐Et,4‐Mepy) 2 (μ‐N 3 ) 2 ] n (3‐Et,4‐Mepy = 3‐Ethyl‐4‐methylpyridine)
Author(s) -
M. AbuYoussef Morsy A.,
Escuer Albert,
Goher Mohamed A. S.,
Mautner Franz A.,
Vicente Ramon
Publication year - 1999
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199904)1999:4<687::aid-ejic687>3.0.co;2-e
Subject(s) - chemistry , manganese , antiferromagnetism , crystallography , azide , chain (unit) , stereochemistry , condensed matter physics , organic chemistry , physics , astronomy
The ligands 3‐ethyl‐4‐methylpyridine (3‐Et,4‐Mepy) and azide coordinate to Mn II forming an alternating chain with the formula [Mn(3‐Et,4‐Mepy) 2 (μ‐N 3 ) 2 ] n . This compound crystallizes in the space group P –1. The compound consists of chains of octahedrally coordinated manganese atoms alternately bridged by double end‐to‐end (μ 1,3 ) and double end‐on (μ 1,1 ) azido bridges, which results in a structurally and magnetically alternating chain. The 3‐ethyl‐4‐methylpyridine ligands are arranged trans , completing the six‐fold coordination spheres of the manganese atoms. The Mn–Mn distances are distinctly different: Mn(1)–Mn(1A) = 5.149(3) Å (double end‐to‐end azido bridge) and Mn(1)–Mn(1B) = 3.402(2) Å (double end‐on azido bridge). The magnetic properties of the compound, as studied in the temperature range 300‐4 K, show bulk antiferromagnetic interaction. Fitting of the magnetic data by using an equation for alternating ferro‐antiferromagnetic S = 5/2 1‐D systems gives the parameters J AF = –13.7(1) cm −1 , J F = 2.4(1) cm −1 , g = 2.036(2).