Complexes of propyl mercury thiocyanates with cobalt, nickel, and zinc thiocyanate
作者:P. P. Singh、V. P. Singh
DOI:10.1139/v82-335
日期:1982.9.15
general formula (SCN)2M(NCSHgR)2. Conductance measurements and infrared and electronic spectral studies indicate that M and mercury atoms are linked by bridging thiocyanate groups. Cobalt and zinc are tetrahedrally coordinated, whereas nickel is octahedral. With the exception of zinc analogs, these compounds form complexes with Lewis bases. Pyridine and nicotinamide form adducts of general formula L2(SCN)2M(NCSHgR)2
Tetrathiopyridyl-tetrathiafulvalene-based Cd(<scp>ii</scp>) coordination polymers: one ligand, one metal cation, many possibilities
作者:Damien Bechu、Guillaume Rogez、Mir Wais Hosseini、Stéphane A. Baudron
DOI:10.1039/c9nj03572a
日期:——
CdI2, Cd(NO3)2 and Cd(NCS)2 salts for the construction of a series of coordinationpolymers. Five networks presenting four different arrangements have been obtained and characterized by single-crystal X-Ray diffraction along with three isostructural compounds with other M(NCS)2 salts (M = Mn, Fe, Co). Whereas one is based on infinite Cd(NCS)2}∞ chains, the others are constructed from mononuclear nodes
Solid-state transformation of [Co(NCS)2(pyridine)4] into [Co(NCS)2(pyridine)2]n: from Curie–Weiss paramagnetism to single chain magnetic behaviour
作者:Jan Boeckmann、Christian Näther
DOI:10.1039/c0dt00904k
日期:——
Reaction of Co(NCS)2 with pyridine (pyr) in aqueous solution at roomtemperature leads to the formation of the pyridine-rich 1 : 4 compound of composition [Co(NCS)2(pyridine)4] (1) reported recently. On heating, the pyridine-rich 1 : 4 compound transforms into its corresponding pyridine-deficient 1 : 2 compound of composition [Co(NCS)2(pyridine)2]n (2), which decomposes on further heating. In the crystal
[Co(NCS)2(py)2]n (py = pyridine) is composed of ferromagnetic chains of Co(II) cations connected by double NCS bridges. The chains are irregular because of two crystallographically inequivalent Co(II) cations. The coordination polyhedron of the Co(II) cations is a distorted octahedron built from two N and two S atoms of four equatorial NCS anions and two apical N atoms of the pyridine ligands. Magnetic
[Co(NCS)2(py)2 ] n(py =吡啶)由通过双NCS桥连接的Co(II)阳离子的铁磁链组成。由于两个晶体学上不等价的Co(II)阳离子,这些链是不规则的。Co(II)阳离子的配位多面体是一种扭曲的八面体,由四个赤道NCS阴离子的两个N和两个S原子和吡啶配体的两个顶端N原子构成。磁性和比热研究表明,该化合物在3.7 K处发生相转变为铁磁态。确定的磁相互作用,链内(J / k B = 28 K)和链间(zJ′/ k B = 0.5 K),确定[Co(NCS)2(py)2 ] n的准一维伊辛磁特性。使用交流磁化率测量,确定了不同弛豫过程的磁化逆转的能垒,包括各个链的能垒。通过高场-高频ESR研究,在Ising模型的框架中观察并解释了磁激发,并与磁研究的结果相吻合。从头算计算证实了系统的高磁各向异性,并允许确定易轴的方向。破损的对称DFT计算支持铁磁链内相互作用。讨论了与松弛有关的能
作者:Damien Bechu、Lilia S. Xie、Nolwenn Le Breton、Sylvie Choua、Mircea Dincă、Mir Wais Hosseini、Stéphane A. Baudron
DOI:10.1039/c9cc09960c
日期:——
The electronic conductivity of two isostructural interdigitated coordination polymers based on a novel tetrathiafulvalene derivative and M(NCS)2 nodes (M = Fe, Co) is enhanced upon surface oxidation of the crystals by iodine.