Alkinylverbindungen von Übergangsmetallen, XXXVIII [1]. Komplexe Mangan(II)-Verbindungen des 1.2-Diethinylbenzols / Alkynyl Compounds of Transition Metals, XXXVIII [1]. Complex Manganese(II) Compounds of 1,2-Diethynylbenzene

1980 ◽  
Vol 35 (2) ◽  
pp. 248-249 ◽  
Author(s):  
Reinhard Nast ◽  
Amelia Santos
Keyword(s):  
Transition Metals ◽  
High Spin ◽  
Magnetic Moment ◽  
Potassium Salt ◽  
Liquid Ammonia ◽  
Solid Compounds

The high-spin d5 complexes M2Mn(1,2-C6H4(C≡C)2)2 (M = K, Na) are prepared in liquid ammonia according to equation (1). The magnetic moment and the position of the IR-active υC ≡ C of the potassium salt are discussed with respect to the structure of the solid compounds.

High-spin enforcement in first-row metal complexes of a constrained polyaromatic ligand: synthesis, structure, and properties

2018 ◽  
Vol 42 (23) ◽  
pp. 18667-18677 ◽  
Author(s):  
Lizhu Chen ◽  
Hunter A. Dulaney ◽  
Branford O. Wilkins ◽  
Sarah Farmer ◽  
Yanbing Zhang ◽  
...  
Keyword(s):  
Coordination Chemistry ◽  
Transition Metals ◽  
Metal Complexes ◽  
High Spin ◽  
Structure And Properties ◽  
Polypyridyl Ligand ◽  
Ligand Synthesis

The coordination chemistry of a rigid tetradentate polypyridyl ligand has been developed with first-row transition metals Mn(ii), Fe(ii), Co(ii), Ni(ii), and Zn(ii).

Sulphur-nitrogen chelating agents. VI. Five- and six-coordinate complexes of 3d metal ions with an SNN tridentate ligand

1969 ◽  
Vol 22 (8) ◽  
pp. 1613 ◽  
Author(s):  
PSK Chia ◽  
SE Livinhstone
Keyword(s):  
Metal Ions ◽  
High Spin ◽  
Infrared Spectra ◽  
Magnetic Moment ◽  
Nickel Complex ◽  
Copper Complexes ◽  
Chelating Agents ◽  
Iron Complex ◽  
Tridentate Ligand ◽  
Infrared Data

Mono-ligand complexes of 6-methylpyrid-2-yl-N-(2?-methylthiophenyl)- methyleneimine (SNSMe) of the type MX2(SNNMe) (M = Mn, Fe, Co, Xi, and Cu; X = Cl, Br, I, or NCS) have been prepared. Infrared data show that in all the complexes the ligand (SNNMe) is tridentate. The electronic and infrared spectra indicate that the complexes of manganese, iron, and cobalt are five-coordinate, whereas the nickel and copper complexes are six-coordinate and polymeric. The complex CO(NO3)2(SNNMe) is six- coordinate and contains one bidentate and one unidentate nitrato group. ��� The bis-ligand complexes [N(SNNMe)2]Y2 (M = Fe, Ni, and Cu; Y = ClO4 or BF4) were also isolated. The iron complex is low-spin (μ 1.5 B.M.) but the magnetic moment of the nickel complex (μ 3.0 B.M.) is normal for high-spin octahedral nickel(II).

Alkinylverbindungen von Übergangsmetallen, XXXVI [1]. Kupfer(I)-Verbindungen des 1.2-Diethinylbenzols / Alkynyl Compounds of Transition Metals, XXXVI [1]. Copper(I) Compounds of 1,2-Diethynylbenzene

1979 ◽  
Vol 34 (6) ◽  
pp. 856-858 ◽  
Author(s):  
Reinhard Nast ◽  
Wulf-Heiner Lepel
Keyword(s):  
Transition Metals ◽  
Liquid Ammonia ◽  
Dipotassium Salt

The diamagnetic complexes 1,2-C6H4(C≡CCu)2, 1,2-C6H4(C≡CCU)2·2 Pet3, 1,2-C6H4(C≡CCu)2·Pet3 (et=C2H5) and K3Cu(1,2-C6H4(C≡C)2)2 are prepared by reactions of Cul with the dipotassium salt of 1,2-diethynylbenzene o-C6H4(C≡CK)2 in liquid ammonia. The IR-active νC≡C frequencies and possible structures of the polymeric solids are discussed.

New high-spin clusters featuring transition metals

2007 ◽  
pp. 260-278
Author(s):  
Euan K. Brechin ◽  
Alasdair Graham ◽  
Paul E. Y. Milne ◽  
Mark Murrie ◽  
Simon Parsons ◽  
...  
Keyword(s):  
Transition Metals ◽  
High Spin ◽  
Spin Clusters

FORMATION OF MAGNETIC MOMENTS IN INTERMETALLIC COMPOUNDS AND ALLOYS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 756-759 ◽  
Author(s):  
T. BEUERLE ◽  
K. HUMMLER ◽  
M. FÄHNLE
Keyword(s):  
Transition Metals ◽  
Ab Initio ◽  
Intermetallic Compounds ◽  
Magnetic Moment ◽  
Nearest Neighbor ◽  
Physical Mechanism ◽  
Magnetic Moments ◽  
Lmto Method ◽  
Minimum Number ◽  
Alloy Systems

Jaccarino and Walker proposed that in certain alloy systems a considered kind of atom attains a constant value of the magnetic moment if it is surrounded by at least a minimum number of nearest-neighbor atoms of a certain kind, and that it is nonmagnetic otherwise. It is shown by ab initio supercell calculations within the LMTO method that the system Nbi−xMox with 1% iron approximately fulfills the Jaccarino-Walker hypothesis, whereas the alloy FexRh1−x does not. The physical mechanism for the destruction of the Fe moment in bcc alloys with 4d and 5d transition metals is elucidated.

Substituted phenanthrolines and their metal chelates

1973 ◽  
Vol 26 (5) ◽  
pp. 951 ◽  
Author(s):  
EJ Halbert ◽  
CM Harris ◽  
E Sinn ◽  
GJ Sutton
Keyword(s):  
Magnetic Properties ◽  
High Spin ◽  
Copper Complex ◽  
Magnetic Moment ◽  
Room Temperature ◽  
Spin Crossover ◽  
Metal Chelates ◽  
One Step

Substituents at and adjacent to the nitrogen atoms in 2,2?-bipyridyl and 1,10-phenanthroline are most likely to cause drastic changes in the magnetic properties of complexes with these ligands. Complexes of the N-oxides (2,2?-bipyridine 1,1?-dioxide, and 1,10-phenanthroline 1- oxide) with copper, and of 2-substituted phen (substituent = Cl, CONH2) with iron(II) are investigated, and a new one-step reaction to convert phno into cphn is reported. The copper complex Cu(bpyo)Br2 shows antiferromagnetic interactions, but other complexes Cu(bpyo)X2 (X = Cl, NO3) with this ligand are magnetically normal, as are Cu(phno)Cl2 and Cu(phno)Br2. The complex [Fe(cphn)3] (ClO4)2 lies near the high spin-low spin crossover for iron(II), and its magnetic moment is normal at room temperature but falls with decreasing temperature. The dioxide of phen appears not to be formed by the literature method and no successful synthesis can be reported here.

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