GuoFang Zhang

Find an error

Name: 张国防; GuoFang Zhang

Organization: Shaanxi Normal University

Department: Key Laboratory of Applied Surface and Colloid Chemistry, MOE/School of Chemistry and Chemical Engineering

Title: Professor

Chemicals
References

Formation of a robust Ru4O4 skeleton with two Ru2(CO)4 units in criss–cross configuration

Co-reporter:Jindou Yang, Xian Wang, Weiqiang Zhang, Guofang Zhang and Ziwei Gao

RSC Advances 2016 vol. 6(Issue 37) pp:31196-31201

Publication Date(Web):21 Mar 2016

DOI:10.1039/C6RA02558G

Thermolysis of triruthenium dodecacarbonyl Ru3(CO)12 with picolinic acid, 2-furoic acid and 2-thiophenecarboxylic acid was thoroughly studied. Three ruthenium carbonyl products, Ru4(CO)8(μ2-O, η1-N-pic)4 (1) (pic = picolinate), [Ru2(CO)4(fur)2]m (2) (fur = 2-furoate) and [Ru2(CO)4(thi)2]n (3) (thi = 2-thiophenecarboxylate) were isolated. Single crystal X-ray crystallography revealed that compound 1 is a tetraruthenium cluster with two Ru2(CO)4 units in an unexpected criss–cross geometry, while compounds 2 and 3 exhibit the classical sawhorse structure. Compound 1 was stable to common donor ligands and formed solvated compounds Ru4(CO)8(μ2-O, η1-N-pic)4·H2O (4) and Ru4(CO)8(μ2-O, η1-N-pic)4·CH3CN (5) in hydrous toluene and acetonitrile, respectively; compounds 2 and 3 converted into monomers Ru2(CO)4(fur)2(H2O)2·H2O (2b) and Ru2(CO)4(thi)2(CH3OH)2·CH3OH (3b) in hydrous dichloromethane and acetonitrile, respectively. [Ru2(CO)4(pic)2]2 (1a), Ru2(fur)2(CO)6 (2a) and Ru2(thi)2(CO)6 (3a) were proposed as the corresponding intermediates of 1–3 based on in situ FT-IR spectroscopy, LC-MS and the molecular structures of the known ruthenium carbonyl carboxylates.

Alkaline and alkaline earth salts of 5-ferrocenyl-1H-tetrazole. Synthesis, characterization and catalytic effects on thermal decomposition of energetic compounds

Co-reporter:Jizhen Li, Chunyan Wang, Xiaoni Gao, Fengqi Zhao, Kai Zhao, Xuezhong Fan, Guofang Zhang, Weiqiang Zhang, Ziwei Gao

Polyhedron 2016 Volume 106() pp:58-64

Publication Date(Web):26 February 2016

DOI:10.1016/j.poly.2015.12.051

5-Ferrocenyl-1H-tetrazole (HFcTz) was deprotonated using alkali hydroxides or carbonates, yielding the corresponding metal salts [Li4(H2O)8(FcTz)4]·2CH3CN (1), NaFcTz (2), KFcTz (3), RbFcTz·H2O (4) and [Cs2(H2O)](FcTz)2 (5). Ca(FcTz)2·4H2O (6) was prepared by deprotonation of HFcTz with CaO under reflux. Sr(FcTz)2·4H2O (7) and [Ba(H2O)6](FcTz)2·H2O (8) were synthesized using HFcTz with Sr(OH)2·8H2O and Ba(OH)2·8H2O, respectively. All salts were characterized by FT-IR, UV−Vis and elementary analysis. The crystal structures of HFcTz, 1, 2, 5, 8 and [Ba2(H2O)8](FcTz)4·5H2O (8′) were additionally characterized by single crystal X-ray diffraction. TG and DSC analyses revealed that the new compounds have high thermal stability. Cyclic voltammetry investigations suggested that the compounds except 8 exhibit redox waves for the ferrocenyl groups and are considered as quasi-reversible/irreversible redox systems. Their catalytic effects on the thermal degradation of ammonium perchlorate (AP), 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX) and 1,2,5,7-tetranitro-1,3,5,7-tetraazacyclooctane (HMX) were evaluated by DSC technique. All the new compounds exhibit high catalytic activity for the thermal decomposition of AP and their catalytic activity is higher than that of HFcTz. Most of the new compounds can also accelerate the thermal degradation of RDX.Alkaline and alkaline earth metal salts of 5-ferrocenyl-1H-tetrazole were synthesized and structurally characterized. The salts have excellent thermal stability and exhibit high catalytic activity for the thermal decomposition of ammonium perchlorate and 1,3,5-trinitro-1,3,5-triazacyclohexane.

Single-site SBA-15 supported zirconium catalysts. Synthesis, characterization and toward cyanosilylation reaction

Co-reporter:Wei Xu, Bo Yu, Ying Zhang, Xi Chen, Guofang Zhang, Ziwei Gao

Applied Surface Science 2015 Volume 325() pp:227-234

Publication Date(Web):15 January 2015

DOI:10.1016/j.apsusc.2014.11.064

Highlights

•: Some Zr active species have been anchored on the surface of SBA-15 by SOMC technique.
•: The structures of the Zr species have been characterized by a variety of techniques.
•: The anchored Zr species are single-sited surface complexes.
•: The Zr surface complexes are catalytic active for cyanosilylation of benzaldehyde.

Ionic Ferrocene-Based Burning-Rate Catalysts with Polycyano Anions: Synthesis, Structural Characterization, Migration, and Catalytic Effects during Combustion

Co-reporter:Xuelin Liu;Jizhen Li;Fuqiang Bi;Weiqiang Zhang;Ziwei Gao

European Journal of Inorganic Chemistry 2015 Volume 2015( Issue 9) pp:1496-1504

Publication Date(Web):

DOI:10.1002/ejic.201403023

Abstract

Alkylferrocene-based burning-rate (BR) catalysts, have a high tendency to migrate during curing and storage due to their neutral and nonpolar nature. To overcome these drawbacks, fifteen novel ionic compounds, 1-(ferrocenylmethyl)imidazolium paired with polycyano anions, were synthesized and characterized. The structures of eleven of the compounds were confirmed by single-crystal X-ray diffraction. Compound 1 crystallizes in the tetragonal space group I4(1)/a; 2, 12 and 15 crystallize in the monoclinic space group P2₁/c, and 3 in the monoclinic space group P2₁/n; 4, 6–8, 13 and 14 crystallize in the triclinic space group P. Cyclic voltammetry investigations suggested that most of the compounds exhibit quasireversible redox systems. Compounds 1–10 have high thermal stability (> 190 °C). Migration studies revealed that these compounds are low-migratory materials. The thermal degradation of ammonium perchlorate (AP), hexogen (RDX), and octogen (HMX) catalyzed by these compounds was evaluated by differential scanning calorimetry (DSC) and by thermogravimetric (TG) techniques. The results show that the decomposition peak temperature of AP shifts downwards dramatically and that the released heat of AP increases significantly with the new compounds as additives (5 wt.-%). Moreover, the ionic compounds exhibit significant effects on the thermal decomposition of RDX. The catalytic activities of the new compounds are higher than those of their nitrate and picrate analogues, which supports the conclusion that high nitrogen content in a ferrocene-based BR catalyst is favorable for its combustion catalytic activity.

Ionic Ferrocene-Based Burning-Rate Catalysts with Polycyano Anions: Synthesis, Structural Characterization, Migration, and Catalytic Effects during Combustion (Eur. J. Inorg. Chem. 9/2015)

Co-reporter:Xuelin Liu;Jizhen Li;Fuqiang Bi;Weiqiang Zhang;Ziwei Gao

European Journal of Inorganic Chemistry 2015 Volume 2015( Issue 9) pp:

Publication Date(Web):

DOI:10.1002/ejic.201590033

Ionic Ferrocene-Based Burning-Rate Catalysts with Polycyano Anions: Synthesis, Structural Characterization, Migration, and Catalytic Effects during Combustion

Co-reporter:Xuelin Liu;Jizhen Li;Fuqiang Bi;Weiqiang Zhang, ;Ziwei Gao

European Journal of Inorganic Chemistry 2015 Volume 2015( Issue 9) pp:

Publication Date(Web):

DOI:10.1002/ejic.201500237

Abstract

Invited for the cover of this issue is the group of Guofang Zhang from Shaanxi Normal University, China. The cover image shows how to develop low-migratory ferrocene-based burning-rate catalysts (BRCs) for the next generation of rocket propellants.

Low-migratory ionic ferrocene-based burning rate catalysts with high combustion catalytic efficiency

Co-reporter:Xuelin Liu, Weiqiang Zhang, Guofang Zhang and Ziwei Gao

New Journal of Chemistry 2015 vol. 39(Issue 1) pp:155-162

Publication Date(Web):01 Oct 2014

DOI:10.1039/C4NJ01216J

Alkyl substituted ferrocenes can catalyze the burning of composited solid propellants efficiently. These non-polar and volatile ferrocenes, however, migrate to the surface of the propellants during prolonged storage, which would alter the designed burning parameters, and more seriously cause unexpected explosions. To tackle this problem, twelve ionic ferrocene derivatives bearing methylimidazolium and methyltriazolium substituents with nitrate and picrate anions as new ionic ferrocene-based burning rate catalysts were synthesized. The compounds were fully characterized by 1H NMR, 13C NMR and elemental analysis. Ten of them were characterized by single-crystal X-ray diffraction. Compounds 2 and 3 crystallize in the monoclinic space group P2(1)/n and P2(1)/c, respectively. Compounds 4·H2O, 6·1/2H2O, 8–10 and 12 crystallize in the triclinic space group P. Compounds 7 and 11 crystallize in the orthorhombic space group Pna21 and Pna2(1), respectively. Cyclic voltammetry investigations revealed that all the compounds exhibit quasi-reversible redox systems. Migration studies confirmed that the migration of these ionic ferrocenes is much slower than that of 2,2-bis(ethylferrocenyl)propane. The migration trend of the compounds is dependent on molecular structures of the ionic ferrocenes and that shorter alkyl chain lengths in the heterocyclic rings lead to slower migration rates. Their high thermal stability was determined by TG and DSC analyses (peak temperatures >172 °C). The thermal degradation of ammonium perchlorate (AP) catalyzed by the new burning-rate catalysts was evaluated by DSC methods. In the presence of nitrate (1–6) in 4 wt% or picrate (7–12) in 5 wt%, the peak decomposition temperature of AP shifts left significantly while the released heat increases dramatically. The catalytic activity of an ionic compound with a triazole ring in its cation is higher than its corresponding analog with an imidazole ring and the catalytic activity of a nitrate is generally higher than its picrate counterpart.

5-Ferrocenyl-1H-tetrazole-Derived Transition-Metal Complexes: Synthesis, Crystal Structures and Catalytic Effects on the Thermal Decomposition of the Main Components of Solid Propellants

Co-reporter:Chunyan Wang;Jizhen Li;Xuezhong Fan;Fengqi Zhao;Weiqiang Zhang;Ziwei Gao

European Journal of Inorganic Chemistry 2015 Volume 2015( Issue 6) pp:1012-1021

Publication Date(Web):

DOI:10.1002/ejic.201402894

Abstract

With the aim of developing low-migratory burning-rate (BR) catalysts for solid propellants, a series of transition-metal complexes of 5-ferrocenyl-1H-tetrazole (HFcTz), [Cu₂(bpy)₂(FcTz)₄]·2C₂H₅OH (1), [Pb(phen)₂(H₂O)₃](FcTz)₂·H₂O (3), [Cu(phen)₃](FcTz)₂·8H₂O (4), [Mn(phen)₂(H₂O)₂](FcTz)₂ (5), [Mn(bpy)(H₂O)₄](FcTz)₂ (6), [Ni(phen)₃](FcTz)₂·9H₂O (7), and [Co(phen)₃](FcTz)₂·9H₂O (8) (bpy = 2,2′-bipyridine; phen = 1,10-phenanthroline), were synthesized and structurally characterized. Only a limited number of single crystals of [Pb₂(phen)₄(CO₃)](FcTz)₂·phen·9H₂O (2) were formed so only its crystal structure was analyzed. The complexes show high thermal stability. Cyclic voltammetry investigations suggested that 1 and 3–7 exhibit quasireversible redox systems. Their catalytic effects on the thermal degradation of ammonium perchlorate (AP), 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX), and 1,2,5,7-tetranitro-1,3,5,7-tetraazacyclooctane (HMX) were evaluated by differential scanning calorimetry (DSC) and thermogravimetric (TG) methods. The optimum content of the new compounds in AP, RDX, and HMX was established to be 5, 5, and 2 wt.-%, respectively. They exhibit high catalytic activities in the thermal decomposition of AP and RDX. Among them, 6 was found to be the best ferrocene-based BR catalyst.

Synthesis, characterization, migration studies and combustion catalytic performances of energetic ionic binuclear ferrocene compounds

Co-reporter:Xuelin Liu, Dongmei Zhao, Fuqiang Bi, Xuezhong Fan, Fengqi Zhao, Guofang Zhang, Weiqiang Zhang, Ziwei Gao

Journal of Organometallic Chemistry 2014 Volume 762() pp:1-8

Publication Date(Web):15 July 2014

DOI:10.1016/j.jorganchem.2014.03.011

•The concept of energetic ionic compounds was introduced in Fc-based BR catalyst.•14 energetic ionic ferrocene compounds have been prepared.•They show highly thermal stability and very low migration tendency.•They exhibit efficient effect on thermal decomposition of some energetic materials.The concept of energetic ionic compounds was introduced to retard migration problems encountered in ferrocene-based burning rate catalysts. Fourteen novel compounds, N,N′-bis[(ferrocenylmethyldimethyl)]-1,n-alkylenediammonium (alkylene chain length n = 3–6, 8–10) dinitrate and dipicrate, were synthesized and characterized by NMR, FT-IR, UV–vis spectroscopy, etc. Their thermal stability was determined by TG-DSC technique and found that most of them are thermally stable up to 160 °C. The cyclic voltammetry analysis revealed that the ionic compounds each shows a redox wave for ferrocenyl moiety and the non-conjugated alkylene spacers exert almost no influence on their redox properties. Migration tests showed that their migration tendency is much slower than that of extensively used 2,2-bis(ethylferrocenyl)propane (Catocene) and increases with the extention of alkylene chain length in the cations. Their catalytic performances for thermal decomposition of ammonium perchlorate (AP), 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX) and 1,2,5,7-tetranitro-1,3,5,7-tetraazacyclooctane (HMX) were evaluated by DSC method. The ionic compounds presented highly combustion catalytic activity in thermal degradation of AP and RDX. The best catalytic activity in thermodecomposition of AP was obtained with N,N-bis(ferrocenylmethyldimethyl)1,3-propylene diammonium dinitrate, 1. The catalytic activity of 1 is better than that of Catocene and 1 could be used as an alternative to Catocene in hydroxyl-terminated polybutadiene/ammonium perchlorate (HTPB/AP) composite propellants.Fourteen energetic ionic ferrocene derivatives were synthesized and characterized. They showed very slow migration tendency and highly combustion catalytic activity in thermal decomposition of some main components of solid propellants.

Preparation and characterization of LaNiO3 films grown by metal-organic deposition

Co-reporter:Yao Wang;Chengshan Li;Guo Yan;Yafeng Lu

Bulletin of Materials Science 2011 Volume 34( Issue 7) pp:1379-1383

Publication Date(Web):2011 December

DOI:10.1007/s12034-011-0332-9

We have investigated the synthesis and characterization of LaNiO3 (LNO) layers deposited on YSZ (100) substrate by metal-organic deposition (MOD). Texture, morphology and electrical properties of the LaNiO3 films were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM) and electrical resistivity measurement. It has been found that the formation of (h00) orientation depends on pyrolysis temperature, annealing temperature and thickness of LaNiO3 layers. The LaNiO3 films prepared under optimal condition indicate highly (h00) orientation and a rather smooth surface. The LaNiO3 films show a metallic behaviour in the measured temperature range.

Syntheses, Structural Characterization and Thermoanalysis of Transition-Metal Compounds Derived from 3,5-Dinitropyridone

Co-reporter:Rong Fan;Qiu-Ping Zhou;Guo-Fang Zhang;Mei-Yu Cai

Journal of Chemical Crystallography 2010 Volume 40( Issue 3) pp:266-271

Publication Date(Web):2010 March

DOI:10.1007/s10870-009-9644-7

Nine metal compounds of Mn(II), Zn(II) and Cd(II) derived from dinitropyridone ligands (3,5-dinitropyrid-2-one, 2HDNP; 3,5-dinitropyrid-4-one, 4HDNP and 3,5-dinitropyrid-4-one-N- hydroxide, 4HDNPO) were characterized by elemental analysis, FT-IR and partly by TG-DSC. Three of which were further structurally characterized by X-ray single-crystal diffraction analysis. The structures of the three compounds, Mn(4DNP)2(H2O)4, 4, Zn(4DNPO)2(H2O)4, 8, and Cd(4DNPO)2(H2O)4, 9, crystallize in the monoclinic space group P2(1)/n and Z = 2, with a = 8.9281(9), b = 9.1053(9), c = 10.6881(11) Å, β = 97.9840(10)° for 4; a = 8.4154(7), b = 9.9806(8), c = 10.5695(8) Å, β = 97.3500(10)° for 8; a = 8.5072(7), b = 10.2254(8), c = 10.5075(8) Å, β = 96.6500(10)° for 9. All three complexes are octahedral consisting of four equatorial water molecules, and two nitrogen or oxygen donor ligands (DNP or DNPO). The abundant hydrogen-bonding and π-π stacking interactions seem to contribute to stabilization of the crystal structures of the compounds. The TG-DTG results revealed that the complexes showed a weight loss sequence corresponding to all coordinated water molecules, nitro groups, the breaking of the pyridine rings and finally the formation of metal oxides.

Crystal Structures and Thermal Properties of Two Transition-Metal Compounds {[Ni(DNI)2(H2O)3][Ni(DNI)2 (H2O)4]}·6H2O and Pb(DNI)2(H2O)4 (DNI = 2,4-Dinitroimidazolate)

Co-reporter:Guo-Fang Zhang;Mei-Yu Cai;Ping Jing;Chong He

Journal of Chemical Crystallography 2010 Volume 40( Issue 3) pp:278-282

Publication Date(Web):2010 March

DOI:10.1007/s10870-009-9646-5

Two transition-metal compounds derived from 2,4-dinitroimidazole, {[Ni(DNI)2(H2O)3][Ni(DNI)2(H2O)4]}·6H2O, 1, and Pb(DNI)2(H2O)4, 2, were characterized by elemental analysis, FT-IR, TG-DSC and X-ray single-crystal diffraction analysis. Crystal data for 1: monoclinic, space group C2/c, a = 26.826(3), b = 7.7199(10), c = 18.579(2) Å, β = 111.241(2)° and Z = 4; 2: monoclinic, space group C2/c, a = 6.5347(6), b = 17.1727(17), c = 14.1011(14) Å, β = 97.7248(10) and Z = 4. Compound 1 contains two isolated nickel centers in its structure, one being six-coordinate and another five-coordinate. The structure of 2 contains a lead (II) center surrounded by two chelating DNI ligands and four water molecules in distorted square-antiprism geometry. The abundant hydrogen bonds in two compounds link the molecules into three-dimensional network and stabilize the molecules. The TG-DSC analysis reveals that the first step is the loss of water molecules and the final residue is the corresponding metal oxides and carbon.

Synthesis, structural characterization and catalytic activities of dicopper(II) complexes derived from tridentate pyrazole-based N2O ligands

Co-reporter:Guo-Fang Zhang;Qiu-Ping Zhou;Yin-Li Dou;Mai-Hua Yin;Yao Wang

Applied Organometallic Chemistry 2007 Volume 21(Issue 12) pp:

Publication Date(Web):20 NOV 2007

DOI:10.1002/aoc.1336

A group of a diverse family of dinuclear copper(II) complexes derived from pyrazole-containing tridentate N₂O ligands, 1,3-bis(3,5-dimethylpyrazol-1-yl)propan-2-ol (Hdmpzpo), 1,3-bis(3-phenyl-5-methyl pyrazol-1-yl)propan-2-ol (Hpmpzpo) and 1,3-bis(3-cumyl-5-methylpyrazol-1-yl)propan-2-ol (Hcmpzpo), were synthesized and characterized by elemental analysis, IR spectroscopy and three of them also by single-crystal X-ray diffraction. Three complexes, [Cu₂(pmpzpo)₂](NO₃)₂·2CH₃OH (3·2CH₃OH), [Cu₂(pmpzpo)₂](ClO₄)₂ (4) and [Cu₂(cmpzpo)₂](ClO₄)₂·2DMF (7·2DMF), each exhibits a dimeric structure with a inversion center being located between the two copper atoms. The metal ion is coordinated in a distorted square planar environment by two pyrazole nitrogen atoms and two bridging alkoxo oxygen atoms. Both complexes 1·CH₃OH·H₂O and 3·2CH₃OH were investigated in anaerobic conditions for the catalytic oxidation of 3,5-di-tert-butylcatechol (3,5-DTBC) to the corresponding quinone (3,5-DTBQ), for modeling the functional properties of catechol oxidase. Copyright © 2007 John Wiley & Sons, Ltd.

Synthesis and crystal structure of a copper coordination polymer [(Cu(btapo)2BrCH3OH)+Br−]n (btapo=1,3-bis(benzotriazol-1-yl) propan-2-ol)

Co-reporter:Guo-Fang Zhang;Yin-Li Dou;Jiang-Bo She

Journal of Chemical Crystallography 2007 Volume 37( Issue 1) pp:63-67

Publication Date(Web):2007 January

DOI:10.1007/s10870-006-9152-y

A new coordination polymer [(Cu(btapo)2BrCH3OH)+Br−]n (btapo = 1,3-bis(benzotria- zol-1-yl) propan-2-ol) was synthesized by the reaction of CuBr2 and btapo, a new ligand synthesized in our laboratory, in THF. Its structure was determined by single-crystal X-ray crystallography. It crystallizes in tetragonal I4(1)/a space group with the crystal cell parameters of a=11.987(9) Å, c=54.24(4) Å, V=7794(10) Å3, and Z=8. The crystal X-ray analysis shows that each copper atom is five-coordinated with a bromine atom and four nitrogen atoms from four ligands to form a slightly distorted square pyramid. Each ligand bridges two copper atoms to form a two-strand helical chain. The chains are further extended to a three-dimensional network by the hydrogen bonds between the hydroxyl groups and the bromine anions.

The first two structurally characterized energetic catalysts derived from dinitropyridone

Co-reporter:Jiang-Bo She;Guo-Fang Zhang;Feng-Qi Zhao;Zhong-Li Lei

Structural Chemistry 2007 Volume 18( Issue 3) pp:373-378

Publication Date(Web):2007 June

DOI:10.1007/s11224-007-9179-5

Two energetic catalysts, 3,5-dinitro-2-pyridonate of lead (II) (Pb(2DNPO)2, 1) and 3,5-dinitro-4-pyridone-N-hydroxylate tetrahydrate of copper (II) (Cu(4DNPOH)2(H2O)4, 2) were characterized by elemental analysis, FT-IR, TG-DSC and structurally characterized by X-ray single-crystal diffraction analysis. X-ray powder diffraction analysis of complex 1 confirmed the phase homogeneity of the polycrystalline sample. Crystal data for 1: monoclinic, space group P 21/n, a = 8.5253(9), b = 9.2938(10), c = 19.654(2) Å, β = 102.289(2)°, V = 1521.6(3) Å3, Z = 4; 2: monoclinic, space group P 21/n , a = 8.3705(10), b = 9.9307(12), c = 10.5771(12) Å, β = 98.021(2)°, V = 870.62(18) Å3, Z = 2. The complex 1 is a one-dimensional coordination polymer with each Pb(II) atom being six-coordinated, forming a heavily distorted octahedral geometry, by two nitrogen and four oxygen donors. Each ligand links the Pb(II) ions in a chelating bridging mode using nitrogen and oxygen atoms of its pyridonate part. The complex 2 is a copper (II) complex with a compressed octahedral geometry. The Cu(II) atom locates on the equatorial positions defined by oxygen atoms of four water molecules. Its axial positions are filled with two oxygen donors of the pyridine-N-hydroxylate moieties of two ligands. The abundant hydrogen bonds link the molecules into one-dimensional chains. Both the complexes represent the first two examples of the energetic catalysts containing dinitropyridine derivatives characterized crystallographically