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Host–Guest Interaction of 12‐MC‐4, 15‐MC‐5, and Fused 12‐MC‐4 Metallacrowns with Mononuclear and Binuclear Carboxylato Complexes: Structure and Magnetic Behavior
Author(s) -
DendrinouSamara Catherine,
Psomas George,
Iordanidis Lykourgos,
Tangoulis Vassilis,
Kessissoglou Dimitris P.
Publication year - 2001
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20011203)7:23<5041::aid-chem5041>3.0.co;2-6
Subject(s) - chemistry , excited state , crystallography , ground state , crystal structure , ring (chemistry) , population , ferromagnetism , stereochemistry , condensed matter physics , atomic physics , organic chemistry , physics , demography , sociology
Interaction of manganese with salicylhydroxamic ligands leads to the formation of the 12‐membered metallacrown [Mn II 2 (2,4‐DP) 2 (HCOO) 2 ][12‐MC Mn III N(shi) ‐4](py) 6 ( 2 ) (H‐2,4‐DP =2‐(2,4‐dichlorophenoxy)propionic acid) and the 15‐membered metallacrown [Mn II (2,4‐D) 2 ][15‐MC Mn III N(shi) ‐5](py) 6 ( 1 ) (H‐2,4‐D = 2,4‐dichlorophenoxyacetic acid). The crystal structure analysis shows that mononuclear and dinuclear alkanoato complexes are accommodated in the cavity of the metallacrown ring. The magnetic behaviour of 1 and 2 and the magnetic behaviour of the fused 12‐membered metallacrown [Ni II (mcpa)] 2 [12‐MC Ni II N(shi) 2 (pko) 2‐4][12‐MC Ni II N(shi) 3 (pko) ‐4](CH 3 OH) 3 (H 2 O) ( 3 ) (Hmcpa=2‐methyl‐4‐chlorophenoxyacetic acid) have shown that the zero field and/or the population of many energy levels at low temperatures is the reason for the divergence of the susceptibility data at high fields. For compound 3 , the ground state is S =0, with S =1 and S =2 low‐lying excited states. This leads to a non‐Brillouin behaviour of the magnetisation, since the ground state is very close to the excited states.