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Self‐Assembly of Cobalt(II) Coordination Polymers with Differently Halosubstituted Nicotinate Ligands and 4,4’‐Bipyridine – The Effect of the Halosubstituent Positions on Polymer Types
Author(s) -
Hok Lucija,
Lluch Sanchez Eloi,
Vianello Robert,
Kukovec BorisMarko,
Popović Zora
Publication year - 2021
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.202100055
Subject(s) - chemistry , cobalt , denticity , bipyridine , molecule , 2,2' bipyridine , crystallography , coordination polymer , stereochemistry , medicinal chemistry , inorganic chemistry , crystal structure , organic chemistry
Two structurally different 1D cobalt(II) coordination polymers with 4,4’‐bipyridine (4,4’‐bpy) and 2‐chloronicotinate (2‐Cl‐nic) or 5‐bromonicotinate (5‐Br‐nic), namely {[Co(2‐Cl‐nic) 2 (4,4’‐bpy)(H 2 O) 2 ] ⋅ 4H 2 O} n ( 1 ) and {[Co(4,4’‐bpy)(H 2 O) 4 ] [Co(5‐Br‐nic) 4 (H 2 O) 2 ] ⋅ 4,4’‐bpy ⋅ 2H 2 O} n ( 2 ), were prepared under the same experimental conditions. The cobalt(II) ions in 1 are bridged by 4,4’‐bipyridine ligands into a 1D polymeric chain, each cobalt(II) ion being coordinated with two O ‐monodentate 2‐chloronicotinate ligands and two water molecules as well, while 2 consists of a complex cation {[Co(4,4’‐bpy)(H 2 O) 4 ] 2+ } n , in which cobalt(II) ions are bridged by 4,4’‐bipyridine ligands into a 1D polymeric chain, and a complex anion [Co(5‐Br‐nic) 4 (H 2 O) 2 ] 2− , in which cobalt(II) ion is coordinated with four 5‐bromonicotinate ligands (two of them being O ‐monodentate and the other two are N ‐monodentate) and two water molecules. DFT calculations revealed a correlation between the halosubstituent (chlorine or bromine) positions in the employed nicotinate ligands and the cobalt(II) coordination environments in the obtained coordination polymers, being responsible for their different structural types.