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Synthesis, Crystal Structure and Magnetic Properties of Heteropolynuclear Re IV M II Complexes Based on the Robust [ReCl 5 (pyzCOO)] 2– Unit (pyzCOO = 2‐pyrazinecarboxylate)
Author(s) -
Arizaga Livia,
González Ricardo,
Armentano Donatella,
De Munno Giovanni,
Novak Miguel A.,
Lloret Francesc,
Julve Miguel,
Kremer Carlos,
Chiozzone Raúl
Publication year - 2016
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/ejic.201501487
Subject(s) - chemistry , antiferromagnetism , acetonitrile , rhenium , crystallography , crystal structure , ferromagnetism , carboxylate , spin canting , intramolecular force , magnetic susceptibility , inorganic chemistry , stereochemistry , magnetization , condensed matter physics , quantum mechanics , magnetic field , physics , chromatography
The syntheses, crystal structures and magnetic properties of four rhenium(IV) compounds of formulae NBu 4 [ReCl 5 (pyzCOOH)] · H 2 O ( 1 ), [ReCl 5 (µ‐pyzCOO)M(dmphen) 2 ] · 2CH 3 CN [M = Ni ( 2 ) and Co ( 3 )] and {[ReCl 5 (µ 3 ‐pyzCOO)] 2 Mn 2 (dmphen) 3 } n ( 4 ) (NBu 4 = tetra‐ n ‐butylammonium cation, pyzCOOH = 2‐pyrazinecarboxylic acid, dmphen = 2,9‐dimethyl‐1,10‐phenanthroline) are reported herein. Compound 1 was obtained by the reaction of NBu 4 [ReCl 5 (dmf)] (dmf = dimethylformamide) with pyzCOOH in acetone, whereas the other complexes were obtained by the reaction of 1 with M(ClO 4 ) 2 · 6H 2 O [M = Ni ( 2 ), Co ( 3 ), Mn ( 4 )] and dmphen in acetonitrile. Complex 1 is a mononuclear compound, 2 and 3 are neutral heterodinuclear complexes and 4 is a neutral chain in which each pyzCOO – bridges one Re IV and two Mn II in a very unusual µ 3 ‐binding mode. Compounds 2 and 3 behave as magnetically isolated species with intramolecular ferromagnetic coupling between Re IV and Ni II or Re IV and Co II ions, respectively. In turn, weak antiferromagnetic coupling between the Mn II ions through anti‐syn ‐carboxylate bridges together with weak ferromagnetism below 3.1 K due to small spin canting is observed in 4 .