The Experts below are selected from a list of 906 Experts worldwide ranked by ideXlab platform
Baolong Zhang - One of the best experts on this subject based on the ideXlab platform.
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crystal engineered supramolecular metal phosphonates crown ethers and Iminodiacetates
Chemistry of Materials, 2001Co-Authors: Abraham Clearfield, C Krishnamohan V Sharma, Baolong ZhangAbstract:Three classes of metal phosphonates will be described in this brief review. First, we describe the zirconium derivatives of N-(phosphonomethyl)iminodiacetic acid, H2O3PCH2N(CH2COOH)2. The acid itself is a zwitterion formed by transfer of a phosphonic acid proton to the nitrogen. Consequently, the acid forms a phosphonic acid dimer (O···O, 2.61 A). Each carboxyl group then hydrogen bonds with phosphonate oxygens to form a three-dimensional network of short hydrogen bonds. A linear chain compound is formed when the phosphonic acid was combined with Zr(IV), but the addition of phosphoric acid as a spacer molecule results in the formation of layered compounds. When limited amounts of phosphoric acid were added, the layer that formed was of a new type embodying features of both the α- and γ-type zirconium phosphate layers. Increased addition of H3PO4 allowed the layers to revert to the α-type. A series of N-(phosphonomethyl) aza-crown ethers were prepared and reacted with M(IV) and M(II) ions. With zirconium, ...
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crystal engineered supramolecular metal phosphonates crown ethers and Iminodiacetates
Chemistry of Materials, 2001Co-Authors: Abraham Clearfield, C Krishnamohan V Sharma, Baolong ZhangAbstract:Three classes of metal phosphonates will be described in this brief review. First, we describe the zirconium derivatives of N-(phosphonomethyl)iminodiacetic acid, H2O3PCH2N(CH2COOH)2. The acid itself is a zwitterion formed by transfer of a phosphonic acid proton to the nitrogen. Consequently, the acid forms a phosphonic acid dimer (O···O, 2.61 A). Each carboxyl group then hydrogen bonds with phosphonate oxygens to form a three-dimensional network of short hydrogen bonds. A linear chain compound is formed when the phosphonic acid was combined with Zr(IV), but the addition of phosphoric acid as a spacer molecule results in the formation of layered compounds. When limited amounts of phosphoric acid were added, the layer that formed was of a new type embodying features of both the α- and γ-type zirconium phosphate layers. Increased addition of H3PO4 allowed the layers to revert to the α-type. A series of N-(phosphonomethyl) aza-crown ethers were prepared and reacted with M(IV) and M(II) ions. With zirconium, ...
Zhiping Zheng - One of the best experts on this subject based on the ideXlab platform.
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a four shell 136 metal 3d 4f heterometallic cluster approximating a rectangular parallelepiped
Chemical Communications, 2009Co-Authors: Xiangjian Kong, Lasheng Long, Rongbin Huang, Lansun Zheng, David T Harris, Zhiping ZhengAbstract:A nanosized heterometallic cluster containing 60 La(III) and 76 Ni(II) ions, which are arranged into a four-shell, nest-like framework structure, was obtained by the hydrolytic reaction of the mixed La(NO3)3–Ni(NO3)2 system using Iminodiacetate as an ancillary ligand to control the hydrolysis.
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A four-shell, 136-metal 3d-4f heterometallic cluster approximating a rectangular parallelepiped
ROYAL SOC CHEMISTRY, 2009Co-Authors: Xiangjian Kong, Lasheng Long, Lansun Zheng, David Harrisc(department Of Chemistry, University Of T. California), Zhiping ZhengAbstract:通讯作者地址: Long, LS (通讯作者), Xiamen Univ, State Key Lab Phys Chem Solid Surface, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, State Key Lab Phys Chem Solid Surface, Xiamen 361005, Peoples R China 2. Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 3. Univ Arizona, Dept Chem, Tucson, AZ 85721 USA 4. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA 电子邮件地址: lslong@xmu.edu.cn, zhiping@u.arizona.eduA nanosized heterometallic cluster containing 60 La(III) and 76 Ni(II) ions, which are arranged into a four-shell, nest-like framework structure, was obtained by the hydrolytic reaction of the mixed La(NO3)(3)-Ni(NO3)(2) system using Iminodiacetate as an ancillary ligand to control the hydrolysis.NSF CAREER CHE-0238790 NNSFC 20531050,20721001 MSTC 2007CB81530
Abraham Clearfield - One of the best experts on this subject based on the ideXlab platform.
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crystal engineered supramolecular metal phosphonates crown ethers and Iminodiacetates
Chemistry of Materials, 2001Co-Authors: Abraham Clearfield, C Krishnamohan V Sharma, Baolong ZhangAbstract:Three classes of metal phosphonates will be described in this brief review. First, we describe the zirconium derivatives of N-(phosphonomethyl)iminodiacetic acid, H2O3PCH2N(CH2COOH)2. The acid itself is a zwitterion formed by transfer of a phosphonic acid proton to the nitrogen. Consequently, the acid forms a phosphonic acid dimer (O···O, 2.61 A). Each carboxyl group then hydrogen bonds with phosphonate oxygens to form a three-dimensional network of short hydrogen bonds. A linear chain compound is formed when the phosphonic acid was combined with Zr(IV), but the addition of phosphoric acid as a spacer molecule results in the formation of layered compounds. When limited amounts of phosphoric acid were added, the layer that formed was of a new type embodying features of both the α- and γ-type zirconium phosphate layers. Increased addition of H3PO4 allowed the layers to revert to the α-type. A series of N-(phosphonomethyl) aza-crown ethers were prepared and reacted with M(IV) and M(II) ions. With zirconium, ...
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crystal engineered supramolecular metal phosphonates crown ethers and Iminodiacetates
Chemistry of Materials, 2001Co-Authors: Abraham Clearfield, C Krishnamohan V Sharma, Baolong ZhangAbstract:Three classes of metal phosphonates will be described in this brief review. First, we describe the zirconium derivatives of N-(phosphonomethyl)iminodiacetic acid, H2O3PCH2N(CH2COOH)2. The acid itself is a zwitterion formed by transfer of a phosphonic acid proton to the nitrogen. Consequently, the acid forms a phosphonic acid dimer (O···O, 2.61 A). Each carboxyl group then hydrogen bonds with phosphonate oxygens to form a three-dimensional network of short hydrogen bonds. A linear chain compound is formed when the phosphonic acid was combined with Zr(IV), but the addition of phosphoric acid as a spacer molecule results in the formation of layered compounds. When limited amounts of phosphoric acid were added, the layer that formed was of a new type embodying features of both the α- and γ-type zirconium phosphate layers. Increased addition of H3PO4 allowed the layers to revert to the α-type. A series of N-(phosphonomethyl) aza-crown ethers were prepared and reacted with M(IV) and M(II) ions. With zirconium, ...
Xiangjian Kong - One of the best experts on this subject based on the ideXlab platform.
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a four shell 136 metal 3d 4f heterometallic cluster approximating a rectangular parallelepiped
Chemical Communications, 2009Co-Authors: Xiangjian Kong, Lasheng Long, Rongbin Huang, Lansun Zheng, David T Harris, Zhiping ZhengAbstract:A nanosized heterometallic cluster containing 60 La(III) and 76 Ni(II) ions, which are arranged into a four-shell, nest-like framework structure, was obtained by the hydrolytic reaction of the mixed La(NO3)3–Ni(NO3)2 system using Iminodiacetate as an ancillary ligand to control the hydrolysis.
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A four-shell, 136-metal 3d-4f heterometallic cluster approximating a rectangular parallelepiped
ROYAL SOC CHEMISTRY, 2009Co-Authors: Xiangjian Kong, Lasheng Long, Lansun Zheng, David Harrisc(department Of Chemistry, University Of T. California), Zhiping ZhengAbstract:通讯作者地址: Long, LS (通讯作者), Xiamen Univ, State Key Lab Phys Chem Solid Surface, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, State Key Lab Phys Chem Solid Surface, Xiamen 361005, Peoples R China 2. Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 3. Univ Arizona, Dept Chem, Tucson, AZ 85721 USA 4. Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA 电子邮件地址: lslong@xmu.edu.cn, zhiping@u.arizona.eduA nanosized heterometallic cluster containing 60 La(III) and 76 Ni(II) ions, which are arranged into a four-shell, nest-like framework structure, was obtained by the hydrolytic reaction of the mixed La(NO3)(3)-Ni(NO3)(2) system using Iminodiacetate as an ancillary ligand to control the hydrolysis.NSF CAREER CHE-0238790 NNSFC 20531050,20721001 MSTC 2007CB81530
C Krishnamohan V Sharma - One of the best experts on this subject based on the ideXlab platform.
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crystal engineered supramolecular metal phosphonates crown ethers and Iminodiacetates
Chemistry of Materials, 2001Co-Authors: Abraham Clearfield, C Krishnamohan V Sharma, Baolong ZhangAbstract:Three classes of metal phosphonates will be described in this brief review. First, we describe the zirconium derivatives of N-(phosphonomethyl)iminodiacetic acid, H2O3PCH2N(CH2COOH)2. The acid itself is a zwitterion formed by transfer of a phosphonic acid proton to the nitrogen. Consequently, the acid forms a phosphonic acid dimer (O···O, 2.61 A). Each carboxyl group then hydrogen bonds with phosphonate oxygens to form a three-dimensional network of short hydrogen bonds. A linear chain compound is formed when the phosphonic acid was combined with Zr(IV), but the addition of phosphoric acid as a spacer molecule results in the formation of layered compounds. When limited amounts of phosphoric acid were added, the layer that formed was of a new type embodying features of both the α- and γ-type zirconium phosphate layers. Increased addition of H3PO4 allowed the layers to revert to the α-type. A series of N-(phosphonomethyl) aza-crown ethers were prepared and reacted with M(IV) and M(II) ions. With zirconium, ...
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crystal engineered supramolecular metal phosphonates crown ethers and Iminodiacetates
Chemistry of Materials, 2001Co-Authors: Abraham Clearfield, C Krishnamohan V Sharma, Baolong ZhangAbstract:Three classes of metal phosphonates will be described in this brief review. First, we describe the zirconium derivatives of N-(phosphonomethyl)iminodiacetic acid, H2O3PCH2N(CH2COOH)2. The acid itself is a zwitterion formed by transfer of a phosphonic acid proton to the nitrogen. Consequently, the acid forms a phosphonic acid dimer (O···O, 2.61 A). Each carboxyl group then hydrogen bonds with phosphonate oxygens to form a three-dimensional network of short hydrogen bonds. A linear chain compound is formed when the phosphonic acid was combined with Zr(IV), but the addition of phosphoric acid as a spacer molecule results in the formation of layered compounds. When limited amounts of phosphoric acid were added, the layer that formed was of a new type embodying features of both the α- and γ-type zirconium phosphate layers. Increased addition of H3PO4 allowed the layers to revert to the α-type. A series of N-(phosphonomethyl) aza-crown ethers were prepared and reacted with M(IV) and M(II) ions. With zirconium, ...
