Synthesis and Physicochemical Properties of Binary Cobalt(II) Borides. Thermal Reduction of Precursor Complexes [CoLn][B10H10] (L = H2O, n = 6; N2H4, n = 3)

Малинина, Е. А.; Гоева, Л. В.; Бузанов, Г. А.; Авдеева, В. В.; Ефимов, Н. Н.; Козерожец, И. В.; Кузнецов, Н. Т.

doi:10.1134/s0036023619110123

Cited by 18 publications

(7 citation statements)

References 20 publications

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“…Precursor complexes containing easily removed ligands have shown their efficiency in the synthesis of metal borides and related compounds [24][25][26][27]. In the present study, copper(II) complexes with hydrazine (N 2 H 4 ) and ammonia (NH 3 ) were chosen as precursor complexes.…”

Section: Resultsmentioning

confidence: 99%

“…In this case, variation in the nature of the boron cluster anions used can affect both the phase composition (the formation of a boride on a boron nitride matrix or in the form of an individual compound) and the structural features of the formed cobalt monoboride. In the case of thermolysis of nickel(II) and cobalt(II) complexes with the closo-decaborate anion [M(solv) 6 ][B 10 H 10 ] (M = Co, Ni; solv = H 2 O, N 2 H 4 , DMF, DMSO) [25][26][27], two-component systems have been obtained: a boron-containing phase and binary metal compounds. In particular, the thermolysis of the nickel(II) complex [Ni(DMF) 6 ][B 10 H 10 ] led to the formation of the solid solution Ni 3 C 1−x B x + Ni 3 C [26], while the thermolysis of the cobalt(II) complex [Co(N 2 H 4 ) 3 ][B 10 H 10 ] led to the BN boron nitride phase and dicobalt boride Co 2 B [27].…”

Section: Introductionmentioning

confidence: 99%

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Physicochemical Fundamentals of the Synthesis of a Cu@BN Composite Consisting of Nanosized Copper Enclosed in a Boron Nitride Matrix

Malinina,

Myshletsov,

Buzanov

et al. 2023

Inorganics

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The thermal reduction of the copper(II) complexes [CuII(N2H4)3][B10H10]·nH2O (I·nH2O) and [CuII(NH3)4][B10H10]·nH2O (II·nH2O) has been studied in an argon atmosphere at 900 °C. It has been found that the annealing of both compounds results in a Cu@BN boron-containing copper composite. It has been shown that this process leads to the formation of a boron nitride matrix doped with cubic copper(0) nanoparticles due to the copper(II)→copper(I)→copper(0) thermal reduction. The phase composition of annealing products I900 and II900 has been determined based on powder X-ray diffraction, IR spectroscopy and thermal analysis data. The morphology, average particle size and composition of the composite have been determined by TEM and high-resolution TEM + EDS. The average particle size has been found to be about 81 nm and 52 nm for samples I900 and II900, respectively. Comparison of the results obtained using physicochemical studies has shown the identity of the composition of the products of annealing I900 and II900. The electrical properties of a coating based on an I900 sample modified with Cu0→Cu2O in situ during deposition on a chip at 300 °C in air have been studied. As a result, with increasing temperature, an increase in the electrical conductivity characteristic of semiconductors has been observed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Physicochemical Fundamentals of the Synthesis of a Cu@BN Composite Consisting of Nanosized Copper Enclosed in a Boron Nitride Matrix

Malinina,

Myshletsov,

Buzanov

et al. 2023

Inorganics

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“…For example, the lead(II) complexation with hydroxy-closo-decaborates with different types of binding of the OH group to the boron cluster leads to mono-, binuclear, and polymeric complexes [49]. Research in this area is of interest both from the point of view of fundamental science and from the point of view of practice, for example, for the synthesis of functional boron-containing materials [50,51].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Structures of Lead(II) Complexes with Substituted Derivatives of the Closo-Decaborate Anion with a Pendant N3 Group

Matveev,

Dontsova,

Avdeeva

et al. 2023

Molecules

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In this work, we studied lead(II) and cobalt(II) complexation of derivatives [2-B10H9O(CH2)2O(CH2)2N3]2− and [2-B10H9O(CH2)5N3]2− of the closo-decaborate anion containing pendant azido groups in the presence of 1,10-phenanthroline and 2,2′-bipyridyl. Mononuclear [PbL2{An}] and binuclear [Pb2L4(NO3)2{An}] lead complexes (where {An} is the N3-substituted boron cluster) were isolated and studied by IR spectroscopy and elemental analysis. The mononuclear lead(II) complex [Pb(phen)2[B10H9O(CH2)2O(CH2)2N3] and the binuclear lead(II) complex [Pb2(phen)4(NO3)2[B10H9O(CH2)5)N3] were determined by single-crystal X-ray diffraction. In complex [Pb2(phen)4(NO3)2[B10H9O(CH2)5)N3], the boron cluster is coordinated by the metal atom only via the 3c2e MHB bonds. In complex [Pb(phen)2[B10H9O(CH2)2O(CH2)2N3], the coordination environment of the metal includes BH groups of the boron cluster and the oxygen atom of the exo-polyhedral substituent. When the reaction was performed in a CH3CN/water mixture, the binuclear lead(II) complex [(Pb(bipy)NO3)(Pb(bipy)2NO3)(B10H9O(CH2)2O(CH2)2N3)]·CH3CN·H2O was isolated, where the boron cluster acts as a bridging ligand between lead atoms coordinated by the boron cage via the O atoms of the substituent and/or the BH groups. In the course of cobalt(II) complexation, the starting compound (Ph4P)2[B10H9O(CH2)5N3] was isolated and its structure was also determined by X-ray diffraction. Although a number of lead(II) complexes with coordinated N3 are known from the literature, no complexes with the boron cluster coordinated by the pendant N3 group involved in the metal coordination have been isolated.

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“…We did not expose it to higher temperatures; however, based on our previous data for closely related compounds, we can expect them to show reasonable thermal stability. Note that cobalt and nickel compounds of the general formula [ML 6 ][B 10 H 10 ] (M = Co, Ni; L = DMF, H 2 O, 1/2N 2 H 4 ) were used for low-temperature synthesis of metal borides [58][59][60][61]; they contain solvent molecules that can be easily removed when heating. Thermal stability data of gold complexes obtained here could be interesting because gold complexes contain metal in a more oxidized form (gold(III)), and in the presence of boron clusters that act as reducing agents, the obtained compounds should be more powerconsuming compounds.…”

Section: Resultsmentioning

confidence: 99%

Gold(III) Complexation in the Presence of the Macropolyhedral Hydridoborate Cluster [B20H18]2−

et al. 2022

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Gold(III) complexation with the octadecahydrido-eicosaborate anion [B20H18]2– was studied for the first time. It was found that when gold(III) complexes [Au(L)Cl2]BF4 (L = bipy, phen) reacted with [B20H18]2–, complexes [Au(L)Cl2]2[B20H18] were isolated. The compounds consisted of a cationic gold(III) complex [Au(L)Cl2]+ and the hydridoborate cluster as a counterion. X-ray diffraction studies revealed weak B–H...Au interactions for both compounds. Note that more reactive anions [BnHn]2– (n = 10, 12) in similar reactions with gold(III) complexes resulted in gold mirror reactions.

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Synthesis and Physicochemical Properties of Binary Cobalt(II) Borides. Thermal Reduction of Precursor Complexes [CoLn][B10H10] (L = H2O, n = 6; N2H4, n = 3)

Cited by 18 publications

References 20 publications

Physicochemical Fundamentals of the Synthesis of a Cu@BN Composite Consisting of Nanosized Copper Enclosed in a Boron Nitride Matrix

Physicochemical Fundamentals of the Synthesis of a Cu@BN Composite Consisting of Nanosized Copper Enclosed in a Boron Nitride Matrix

Synthesis and Structures of Lead(II) Complexes with Substituted Derivatives of the Closo-Decaborate Anion with a Pendant N3 Group

Gold(III) Complexation in the Presence of the Macropolyhedral Hydridoborate Cluster [B20H18]2−

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