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Abstract
In this paper, three new heterometallic compounds were described and compared with the molecular formula [Cu(pn)2Zn(NCS)4] (1), [Cu(N,N-Me2-en)2Zn(NCS)4] (2), [Cu(N-Me-en)2Zn(NCS)4]∙½H2O (3) where pn = 1,2−diaminopropane, N,N-Me2-en = N,N‒dimethylethylenediamine and N-Me-en = N-methylethylenediamine, respectively. The compounds mentioned above were characterized by elemental analysis, infrared (IR), electronic, electron paramagnetic resonance (EPR) spectra, and magnetic studies. Crystal structures for 1 and 2 were determined by X-ray analysis. Copper(II) in these complexes adopts 4 + 2 coordination with two elongated (in 2 very long and considered as semi-coordination) Cu-S bonds. The Cu-N and Cu-S bond lengths depend on substituent position affecting steric hindrance and hence a topology of the chain. Both chains form different zigzag patterns characterized by one or two Cu-Zn distance values. Weak magnetic interaction is observed, ferromagnetic in the case of 1 and antiferromagnetic in the case of 2, due to diversity of the above structural features.
Highlights
Coordination polymers (CPs) have engaged attention owing to their interesting structural topology features and resulting properties
The key towards the diversity of coordination polymers (CPs) is the design of underlying topology and directionality, which is realized by a judicious choice of metal centers and ligands
We presented three new heterometallic compounds with the formula
Summary
Coordination polymers (CPs) have engaged attention owing to their interesting structural topology features and resulting properties. The thiocyanato-N/S-metalates in reaction with various cationic tectons form numerous zero- [6,7], one- [8,9], two- [10,11], and three-dimensional [4,12] thiocyanato bridged compounds, which manifest interesting structural, physicochemical properties, as well as sometimes potential applications. The properties of thiocyanato-N/S-metalates very frequently lead to one-dimensional chain topologies involving pairs of paramagnetic 3d-3d’ [13,14] and 3d-4d metal ions [15], though the diamagnetic centers are in use [12,16]. The thiocyanato bridges combine alternately the Cr and Ni centers giving the zigzag pattern. In this compound, moderately strong antiferromagnetic interactions between metal centers in the chain were found and Crystals 2019, 9, 637; doi:10.3390/cryst9120637 www.mdpi.com/journal/crystals
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