Synthesis and crystal structure of La21Cr8−2aAlbGe7−bC12 [a = 0.22 (2) and b = 0.758 (19)]
نویسندگان
چکیده
Single crystals of a new multinary chromium carbide, La21Cr8-2a Al b Ge7-b C12 (henicosa-lanthanum octa-chromium aluminium hexa-germanium dodeca-carbide), were grown from an La-rich self flux and were characterized by single-crystal X-ray diffraction. The face-centered cubic crystal structure is composed of isolated and geometrically frustrated regular Cr tetra-hedra that are co-centered within regular C octa-hedra. These mutually separated Cr4-aC6 clusters are distributed throughout a three-dimensional framework of Al, Ge, and La. The title compound is isotypic with La21-δMn8X7C12 and R21Fe8X7C12 (R = La, Ce, Pr; X = Al, Bi, Ge, Sn, Sb, Te) and represents the first example of a Cr-based compound with this structure-type.
منابع مشابه
SYNTHESIS AND CRYSTAL STRUCTURE OF [PPh ] [WOS (CUNCS) ]
The reaction of [PPhJ, NOS,] with CuCl and KSCN (1 :3:3) in acetone produces the yell-ow crystals of [PPh,], [WOS,(CuNCS),]. The crystals are triclinic, space group P1(2), z=2, a=12.4823(7), b=12.9224(7), c=18.6395(10)?, ?=83.907(5), ?= 73.152(4), Y= 65.194(4)'. The crystal structure was determined by single crystal Xray diffraction methods (Mo-K ?) and refined by least-squares calculations ...
متن کاملSYNTHESIS AND CRYSTAL STRUCTURE OF [Pph ] [WS (CUNCS) ] A. Taeb A. Beheshti and N.K. Javadi SYNTHESIS AND CRYSTAL STRUCTURE OF [Pph ] [WS (CUNCS) ]
The crystals of [WS (CuNCS) ] anion have been isolated from CH ,CI solution and examined by X-ray structural analysis as well as by IR spectroscopy. The unit cell is monoclinic with a= 14.3796(13), b= 18.039(1 I), c= 22.5956(23)& P= 96.053(8)', space group P2,/n (14), Z= 4. The crystal structure was refined by the least-squares calculations to a final R-value of 0.0398(Rw= 0.0443) for 2777 u...
متن کاملSynthesis, characterization and crystal structure of a new azo-Schiff base "ethyl 2-((E)-(4-((E)-(4-ethylphenyl)diazenyl)-2-hydroxybenzylidene)amino)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate"
A new azo-Schiff base"Ethyl 2-((E)-(4-((E)-(4-ethylphenyl)diazenyl)-2-hydroxybenzylidene)amino)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate" was prepared by the reaction of "Ethyl 2-amino-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate" and "(E)-5-((4-ethylphenyl)diazenyl)-2-hydroxybenz aldehyde" (1:1 molar ratio) in MeOH under reflux condition. The structure of compound was studied by ...
متن کاملSynthesis, Characterization, and Crystal Structure of a New Coordination Polymer, {[Ba2(Hpydc)2(pydc)(H20)31.H20.(112P3110}n
The reaction of barium chloride with 2, 6-pyridinedicarboxylic acid in water led to the formation of a novelpolymeric complex formulated as {[Ba2(Hpydc)2(pydc)(H20)3].H20.(H2pydc)}.(I). The crystal structure of (I)was characterized by single crystal X-ray diffraction method. The complex was crystallized in the monoclinicsystem with space group P2/c, with four molecule in unit-cell, e.g Z=4. The...
متن کاملSynthesis and crystal structure of Schiff-base compound (E)-4-methoxy-N- (4-hydroxybenzylidene) aniline
New Schiff-base compound (E)-4-methoxy-N-(4-hydroxybenzylidene) aniline has been synthesized from the reaction of 4-hydroxybenzaldehyde with 4-methoxyaniline in methanol at 50ºC, and has been characterized by using elemental analysis and FT-IR spectroscopy. The crystal structure of the title compound has been determined by single crystal X-ray diffraction study. The title compound crystallizes ...
متن کامل