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- W1971470036 abstract "Abstract with M II = Fe, Co, Ni (n = 2) and M II = Cu (n = 1): Four New Coordination Polymers with Acetylenedicarboxylate (ADC 2− ) as Bridging Ligand By slow diffusion of pyridine (Py) into an aqueous solution of a respective metal salt and acetylenedicarboxylic acid (H 2 ADC) single crystals of new coordination polymers of composition (M = Fe, Co, Ni; C2/c, Z = 4) ( 1 – 3 ) and (P2 1 2 1 2 1 , Z = 4) ( 4 ) were obtained. In compounds 1 – 3 octahedral M II O 4 N 2 units are connected via acetylenedicarboxylate anions to form chain‐like polymers. In compound 4 square pyramidal Cu II O 3 N 2 units are found, which are also connected to chains by acetylenedicarboxylates. Thermoanalytical investigations on 3 show an abrupt mass loss of approx. 40 % above 130 °C, which points to a release of both pyridine ligands (calc.: 43 %). Thereafter, the sample decomposes continuously, which is confirmed by XRPD measurements, as an amorphous residue is found. Magnetic susceptibility measurements of 1 – 3 display paramagnetic behaviour in the temperature range 2‐300 K. While μ eff of 3 (d 8 configuration) with orbital singlet ground state is nearly temperature‐independent, 1 (d 6 ) and 2 (d 7 ) exhibit complicated μ eff − T behaviour on account of a ligand‐field ground state derived from the cubic states 5 T 2 and 4 T 1 , respectively. On the basis of a tetragonal ligand‐field model excellent adaptations are obtained with reasonable ligand‐field parameters. Exchange interactions between the magnetic ions are detected in no case." @default.
- W1971470036 created "2016-06-24" @default.
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- W1971470036 date "2007-06-25" @default.
- W1971470036 modified "2023-09-23" @default.
- W1971470036 title "mit M<sup>II</sup> = Fe, Co, Ni (n = 2) und M<sup>II</sup> = Cu (n = 1): Vier neue Koordinationspolymere mit dem Acetylendicarboxylat‐Dianion (ADC<sup>2−</sup>) als verbrückendem Liganden" @default.
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- W1971470036 doi "https://doi.org/10.1002/zaac.200700133" @default.
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