Premium
Three 3‐Amino‐1, 2, 4‐Triazole‐Based Magnetic Complexes Incorporated with Different Carboxylate‐Containing Coligands: Synthesis, Structures, and Magnetic Properties
Author(s) -
Zhang XiYing,
Liu ZhengYu,
Liu ZhongYi,
Yang EnCui,
Zhao XiaoJun
Publication year - 2013
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201300033
Subject(s) - carboxylate , chemistry , phthalic acid , crystallography , antiferromagnetism , hydrogen bond , supramolecular chemistry , paramagnetism , triazole , 1,2,4 triazole , stereochemistry , crystal structure , molecule , medicinal chemistry , organic chemistry , physics , condensed matter physics , quantum mechanics
Three 3‐amino‐1, 2, 4‐triazole (atz)‐based paramagnetic complexes, [Mn(atz)(pa)] n ( 1 ), {[Mn(atz) 1.5 (hip)] · H 2 O} n ( 2 ), and [Mn(H 2 O) 2 (atz) 2 (nb) 2 ] ( 3 ) (H 2 pa = o ‐phthalic acid, H 2 hip = 5‐hydroxylisophthalic acid, and Hnb = p ‐nitrobenzoic acid) were prepared by introducing different carboxylate‐containing aromatic coligands, and structurally and magnetically characterized. Helical Mn II ‐atz and bent Mn II ‐pa 2– chains are crosslinked by sharing the same metal sites to generate a honeycomb‐shaped framework of 1 . The undulated Mn II ‐atz layers constructed from 22‐member metallomacrocycles are periodically supported by ditopic hip 2– ligands to lead to a pillared‐layer structure of 2 . In contrast, complex 3 is a centrosymmetric mononuclear entity, which is assembled into a three‐dimensional supramolecular network by abundant hydrogen‐bonding interactions. The structural difference of 1 – 3 is significantly due to the combinations of the flexible coordination modes adopted by the mixed atz and carboxylate groups. Weak and comparable antiferromagnetic couplings are observed in the nearest neighbors of 1 – 3 , which are cooperatively transmitted either by short carboxylate and/or atz heterobridges or by weak non‐covalent interactions.