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Updated: Oct 13, 2025

Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyltroponeiron
Published on: August 12, 2019
Adapting (4,4) Networks through Substituent Effects and Conformationally Flexible 3,2':6',3"-Terpyridines
Dalila Rocco1, Alessandro Prescimone1, Edwin C Constable1
1Department of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, CH-4058 Basel, Switzerland.
Abstract:
Coordination networks formed between Co(NCS)2 and 4'-substituted-[1,1'-biphenyl]-4-yl-3,2':6',3"-terpyridines in which the 4'-group is Me (1), H (2), F (3), Cl (4) or Br (5) are reported. [Co(1)2(NCS)2]·4.5nCHCl3, [Co(2)2(NCS)2]·4.3nCHCl3, [Co(3)2(NCS)2]·4nCHCl3, [Co(4)2(NCS)2], and [Co(5)2(NCS)2]·nCHCl3 are 2D-networks directed by 4-connecting cobalt nodes. Changes in the conformation of the 3,2':6',3"-tpy unit coupled with the different peripheral substituents lead to three structure types. In [Co(1)2(NCS)2]·4.5nCHCl3, [Co(2)2(NCS)2]·4.3nCHCl3, [Co(3)2(NCS)2]·4nCHCl3, cone-like arrangements of [1,1'-biphenyl]-4-yl units pack through pyridine…arene π-stacking, whereas Cl…π interactions are dominant in the packing in [Co(4)2(NCS)2] The introduction of the Br substituent in ligand 5 switches off both face-to-face π-stacking and halogen…π-interactions, and the packing interactions are more subtly controlled. Assemblies with organic linkers 1-3 are structurally similar and the lattice accommodates CHCl3 molecules in distinct cavities; thermogravimetric analysis confirmed that half the solvent in [Co(3)2(NCS)2]·4nCHCl3 can be reversibly removed.
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