Synthesis, structure, and properties of the novel iron complex of mixed .kappa.3N- and .kappa.3O-tripod ligands: [n-Bu4N][(HB(pz)3)Fe(P3O9)]

1993 ◽  
Vol 32 (11) ◽  
pp. 2597-2599 ◽  
Author(s):  
Kyu Nam Han ◽  
Dongmok Whang ◽  
Hae Jeong Lee ◽  
Youngkyu Do ◽  
Kimoon Kim
Keyword(s):  
Iron Complex ◽  
The Novel ◽  
Structure And Properties ◽  
Tripod Ligands

scholarly journals Preparation and properties of hydrogel based on sawdust cellulose for environmentally friendly slow release fertilizers

2020 ◽  
Vol 9 (1) ◽  
pp. 139-152 ◽  
Author(s):  
Xiao Zhang ◽  
Yanlu Liu ◽  
Panfang Lu ◽  
Min Zhang
Keyword(s):  
Slow Release ◽  
Environmentally Friendly ◽  
Water Absorbency ◽  
The Novel ◽  
Structure And Properties ◽  
Nitrogen Release ◽  
Release Property ◽  
Slow Release Fertilizers ◽  
Grafting Copolymerization ◽  
Cross Linker

AbstractA novel hydrogel slow-release nitrogen fertilizer based on sawdust with water absorbency was prepared using grafting copolymerization. Urea was incorporated as nitrogen source in a hydrogel fertilizer. Potassium persulfate (KPS) and N,N᾽-methylenebis acrylamide (MBA) were used as the initiator and cross-linker, respectively. The structure and properties of the samples were characterized by XPS, EDS, SEM, XRD and FTIR. The effects of various salt solutions, ionic strength and pH on swelling behavior were discussed. The results showed that the largest water absorbency of the sample reached 210 g/g in distilled water. In addition, the sample had the good nitrogen release property. Thus, the novel environmentally friendly hydrogel fertilizer may be widely applied to agricultural and horticultural fields.

scholarly journals Insertion of Phosphenium Ions into a Bicyclo[1.1.0]Tetraphosphabutane Iron Complex

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3920
Author(s):  
Martin Weber ◽  
Gábor Balázs ◽  
Alexander V. Virovets ◽  
Eugenia Peresypkina ◽  
Manfred Scheer
Keyword(s):  
Diffraction Analysis ◽  
Room Temperature ◽  
31P Nmr ◽  
Spectroscopic Studies ◽  
Iron Complex ◽  
The Novel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Phosphenium Ions

By reacting [{Cp‴Fe(CO)2}2(µ,η1:1-P4)] (1) with in situ generated phosphenium ions [Ph2P][A] ([A]− = [OTf]− = [O3SCF3]−, [PF6]−), a mixture of two main products of the composition [{Cp‴Fe(CO)2}2(µ,η1:1-P5(C6H5)2)][PF6] (2a and 3a) could be identified by extensive 31P NMR spectroscopic studies at 193 K. Compound 3a was also characterized by X-ray diffraction analysis, showing the rarely observed bicyclo[2.1.0]pentaphosphapentane unit. At room temperature, the novel compound [{Cp‴Fe}(µ,η4:1-P5Ph2){Cp‴(CO)2Fe}][PF6] (4) is formed by decarbonylation. Reacting 1 with in situ generated diphenyl arsenium ions gives short-lived intermediates at 193 K which disproportionate at room temperature into tetraphenyldiarsine and [{Cp‴Fe(CO)2}4(µ4,η1:1:1:1-P8)][OTf]2 (5) containing a tetracyclo[3.3.0.02,7.03,6]octaphosphaoctane ligand.

Synthesis, structure and properties of the manganese-doped polyoxotitanate cage [Ti18MnO30(OEt)20(MnPhen)3] (Phen = 1,10-phenanthroline)

2015 ◽  
Vol 44 (44) ◽  
pp. 19090-19096 ◽  
Author(s):  
Ning Li ◽  
Peter D. Matthews ◽  
Jane J. Leung ◽  
Timothy C. King ◽  
Paul T. Wood ◽  
...  
Keyword(s):  
The Novel ◽  
Structure And Properties ◽  
Mn Doped

The novel Mn-doped polyoxotitanate [Ti18MnO30(OEt)20(MnPhen)3] decomposes thermally into α-Mn2O3/TiO2.

Bromoselenate(II): Darstellung, Struktur und Eigenschaften von [P(C6H5)4]2SeBr4 und [P(C6H5)4]2Se2Br6 / Bromoselenates(II): Preparation, Structure and Properties of [P(C6H5)4]2SeBr4 and [P(C6H5)4]2Se2Br6

1984 ◽  
Vol 39 (12) ◽  
pp. 1633-1641 ◽  
Author(s):  
Bernt Krebs ◽  
Andreas Schäffer ◽  
Siegfried Pohl
Keyword(s):  
Bond Length ◽  
Vibrational Spectra ◽  
Acetonitrile Solution ◽  
The Novel ◽  
Structure And Properties ◽  
Subsequent Reaction ◽  
Space Group ◽  
X Ray ◽  
Square Planar ◽  
The Mean

The novel anion SeBr42- was prepared by dissociation of SeOBr2 with formation of SeBr2 and subsequent reaction with bromide in acetonitrile solution; it was isolated as the crystalline tetraphenylphosphonium salt. The X-ray structure analysis of [P(C6H 5)4]2SeBr4 (space group P 1̄ , a = 14.190(3), b = 15.125(3), c = 10.383(2) Å , α = 92.69(2), β = 100.89(2), γ = 92.04(2)° Å , V = 2182.2 Å3) shows the structure to contain monomeric SeBr42- anions with a square planar coordination of Se(II). The mean Se -Br bond length in the anion is 2.598 Å .[P(C6H5)4]2Se2Br6 was obtained from the reaction of SeBr4 (which is in equilibrium with SeBr2, Se2Br2, and Br2, in solution) and bromide in acetonitrile. It crystallizes in the space group P 1̄, with a = 1 0 . 9 3 3 ( 4 ) , = 11.154(4), c = 10.344(4) Å , α = 79.26(3), β = 72.63(3), y = 81.35(3)°, γ = 1176.7 Å3 (at -120 °C), and contains a novel type of centrosymmetric Se2Br62- ions with square planar Se-coordination. The mean terminal and bridging Se -Br bond lengths are 2.442 and 2.799 Å , resp. Vibrational spectra are reported and discussed.

Studies on the synthesis, characterization and application of a novel copolymer macromonomer for polymeric solidsolid phase change materials

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Peng Xi ◽  
Xiao-hua Gu ◽  
Bowen Cheng
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Solid Phase ◽  
The Novel ◽  
Structure And Properties ◽  
Crystal Properties ◽  
Polymeric Solid ◽  
Vinyl Group ◽  
Change Material

AbstractA novel copolymer as a macromonomer with a polyethylene glycol (PEG) unit as the phase change element and a vinyl group was synthesized for the preparation of polymeric solid-solid phase change materials. The IR, 1HNMR, DSC and WAXD and POM were employed to determine the structure and properties of the novel monomer. The results show that the novel monomer possess steady molecular structure, excellent crystal properties, higher phase change enthalpy and reactivity. Furthermore, the novel polymeric solid-solid phase change material was also prepared via the copolymerization of the novel copolymer macromonomer and styrene. The phase change properties of the polymeric solid-solid phase change material were characterized.

Properties of a Solid–Solid Phase Change Material PAN/SA-LA/ZMS

2014 ◽  
Vol 703 ◽  
pp. 3-8 ◽  
Author(s):  
Jing Guo ◽  
Xiang Kang You ◽  
Li Zhang ◽  
Heng Xue Xiang ◽  
Sen Zhang ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Solid Phase ◽  
The Novel ◽  
Structure And Properties ◽  
Scanning Calorimetry ◽  
Solution Blending ◽  
Blending Process ◽  
Change Material ◽  
Insulating Properties

In this study, novel solid–solid phase change materials (PCM) composed of polyacrylonitrile, binary of fatty acids ((blending of stearic acid (SA) and lauric acid (LA)) and zeolite molecular sieve (ZMS) were prepared by solution blending process. The structure and properties of the PCM were characterized using flourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), polarized optical microscopy (POM), differential scanning calorimetry (DSC) and thermogravimetric analysis (TG), respectively. DSC analysis indicated that the crystallization latent heat of the PCM was 125.22 J/g and its phase transition temperature was about 17 °C. The temperature curve for step cooling of the PCM showed that it’s holding time achieved 1 480 s, which explains that the PCM had excellent heat-insulating properties. Based on all results it can be concluded that the novel PCM can be considered as potential PCM for thermal energy storage.

Synthese, Struktur und Eigenschaften der Nonachloroditellur(IV)- und Tetrachlorohydroxotellur(IV)säure-Hydrate. Kristallstrukturen der Oxonium-Salze [H9O4]n[Te2Cl9]n und [H9O4][TeCl4OH ] · H2O/Synthesis, Structure and Properties of Nonachloroditellurous and Tetrachlorohydroxotellurous Acid Hydrates. Crystal Structures of the Oxonium Salts [H9O4]n[Te2Cl9]n und [H9O4][TeCl4OH ] · H2O

1992 ◽  
Vol 47 (1) ◽  
pp. 93-103 ◽  
Author(s):  
Bernt Krebs ◽  
Stefan Bonmann ◽  
Klaus Gretenkord
Keyword(s):  
Crystal Structures ◽  
Raman Spectra ◽  
The Novel ◽  
Structure And Properties ◽  
Apical Position ◽  
Space Group ◽  
Light Yellow ◽  
Distorted Octahedral ◽  
The Mean ◽  
Polymeric Anion

Light yellow needles of crystalline nonachloroditellurous acid with the formal composition HTe2Cl9 · 4H2O (1) (space group C2/c, a = 11.642(6), b = 13.012(4), c = 12.663(5) Å, β = 119.64(3)° at 140 K) were isolated from a saturated solution of TeCl4 in conc. HCl. From a solution of more diluted HCl the acid HTeCl4OH · 5H2O (2) could be prepared (space group P212121, a = 7.065(3), b = 8.551(2), c = 18.192(6)Å at 140 K). 1 is the first acid isolated from the system TeCl4 /HCl/H2O with a polymeric anion. The novel polynuclear [Te2Cl9]nn- chains are built from alternately corner-sharing and edge-sharing distorted octahedral TeCl6 units. The mean bond distances are 2.356 Å for terminal Te-Cl and 2.805 Å for Te-μ2Cl. 2 contains square-pyramidal [TeCl4OH]- anions with oxygen in the apical position (Te-Cl: 2.447-2.552 Å; Te-O: 1.926 Å). The cations in both structures are [H9O4]+ hydroxonium ions (O···O (1): 2.47(3), 2.55(2) and 2.57(1) Å; O···O (2): 2.550(4), 2.584(4) and 2.588(5) Å). Thus the formulae of the acids have to be written as [H9O4]n[Te2Cl9]n and [H9O4][TeCl4OH] · H2O. Raman spectra of both compounds are reported.

Structure and Properties of 2,3,3,3-Tetrafluoropropene (HFO-1234yf)

2014 ◽  
Vol 69 (4) ◽  
pp. 379-387 ◽  
Author(s):  
Michael Feller ◽  
Karin Lux ◽  
Christian Hohenstein ◽  
Andreas Kornath
Keyword(s):  
Experimental Data ◽  
Large Scale ◽  
Theoretical Calculations ◽  
Structural Data ◽  
The Novel ◽  
Structure And Properties ◽  
X Ray ◽  
Combustion Properties ◽  
R 134A ◽  
Low Global Warming Potential

The novel refrigerant 2,3,3,3-tetrafluoropropene (HFO-1234yf) is discussed as a replacement for 1,1,1,2-tetrafluoroethane (R-134a) due to its low global warming potential. Although it may therefore have great potential for use on a large scale, no structural data and only a fewvibrational data of the compound are known.We describe low-temperature X-ray structure analysis, vibrational spectra and combustion properties of 2,3,3,3-tetrafluoropropene. The experimental data are compared with the results of theoretical calculations. Furthermore the basic combustion properties have been investigated.

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