Cation-Induced Structural Diversity in the Cobalt(II)/Nitranilato System: A Monomer, a Dimer, a Trimer and a Chain
Year: 2025
Type: article
Abstract: Herein, we show how it is possible to prepare a monomer, a dimer, a trimer and a chain with cobalt(II) and the ligand nitranilato (3,6-dinitro-2,5-dihydroxy-1,4-benzoquinone dianion = C 6 O 4 (NO 2 ) 2 2– = NA 2– ) by simply changing the counter-cations. Thus, we show that when we combine the ligand NA 2– with cobalt(II) in the presence of a bulky cation as PPh 4 +, we obtain compound (PPh 4 ) 4 [Co(NA) 3 ] ( 1 ), which contains the first monomeric anion of the type [Co(L) 3 ] 4– (L = any anilato ligand). With a smaller cation as NMe 4 +, we obtain (NMe 4 ) 2 [Co 2 (NA) 3 (H 2 O) 4 ] ( 2 ), a rare example of anilato-containing dimer based on a transition metal (TM). With a larger cation as NPr 4 +, we obtain a trinuclear cobalt–nitranilato complex formulated as (NPr 4 ) 2 [Co 3 (NA) 4 (H 2 O) 6 ] ( 3 ) and finally, when using the small NH 4 + cation, we obtain the neutral chain: [Co(NA)(H 2 O) 2 ] ( 4 ). This work presents the synthesis and structure of these compounds and the magnetic characterization of compounds 2 – 4 that show the presence of very weak antiferromagnetic interactions between the cobalt centers through the anilato bridges.
Source: Crystal Growth & Design
Institution: Universitat de València
Language: English
Subfield: Inorganic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
OpenAlex ID: W4408766001