Ionothermal Synthesis and Phase Transformation of Organic-inorganic Hybrid Neutral Zincophosphat
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CHEM.RES.CHINESE UNIVERSITIES 201 1,27(4),53 1—535
Ionothermal Synthesis and Phase Transformation of
Organic—inorganic Hybrid Neutral Zinc0ph0sphate
Cluster fZn(HPO4)(H2PO4)][C6H10N302】
DONG Zhao-jun ,YAN Yan ,ZHENG Rong.feng ,LIU Dan ,LI Ji-yang , HAN Zhen.guo and YU Ji—hong‘
.State Key Laboratory"ofInorganic Synthesis and Preparative Chemistry,College ofChemistry,Jilin University
Changehun 130012,P.R.China,"2.Department ofThoracic Surgery,China—Japan Union
Hospital ofJilin University,Changchun 130033,P.R.China
Abstract Ionothermal synthesis was used to prepare a novel amino acid containing hybrid zincophosphate monomer,
『Zn(HPO4)(H2PO4)】【C6H1oN3O2](denoted as ZnPO-cj58).The inorganic framework of[zn(HP04)(H2PO4)】
【C6HloN3O2】consists of 4-membered rings formed by ZnO3OHis and PO2(OH)2 tetrahedra.The HPO4 and amino acid
moieties hang on the Zn center.Such a framework is stabilized by extensive multipoint hydrogen bonds involving the
phosphate units and histidine molecules to form a pseudo-3D supramolecular structure.It is noteworthy that
ZnPO—CJ58 is the first zinc phosphate cluster with amino acid acting as the ligand.It exhibits photoluminescence
excited at fl wavelength of 220 nm.Interestingly,ZnPO—CJ58 can transform into a layered structure(C6HloN302)Zn2‘
(HPO4)(P04)・H2O(ZnPO—CJ36)through further reacting with water or zinc acetate dihydrate in water at 85。C for 1 h.
This work will be helpful for the synthesis of crystalline inorganic-organic hybrid materials with biofunctional mole。
cules.
Keywords Ionothermal;Amino acid;Photoluminescence
Article ID 1005-9040(201 1、-04—531-05
1 lntroduction
The design and synthesis of open-framework transition
metal phosphates have received much attention recently be—
cause of their potential application in catalysis,separation,
optics,and magnetics,and so forth .Since the first discovery
of microporous zinc phosphate with zeolite-like topology by
Stucky and co-workers a large number of zinc phosphates
have been synthesized in the presence of organic and inorganic
structure—directing agents The structural diversity among
various zinc phosphates is remarkable with zero-dimensional
(OD)clusters,one—dimensional(1 D)chains or 1adders,
two-dimensional(2D)layers,and three—dimensional(3D)struc- tures[ 一 1.Interestingly,some low.dimensional structures may be used as precusors to form more complex open—framework
structures under suitable conditions.It will be helpful for us to
elucidate the unclear formation mechanism of open—framework
materials.
Recently,many research interests have been focused on
the synthesis of inorganic—organic hybrid frameworks through
incorporating organic ligands.Particularly,great efforts have
been made to produce chiral open.framework materials.Amino
acids containing both amino and carboxyl groups play impor—
tan[roles,as building blocks of proteins and intermediates,in
metabolism.The USC of amino acid as ligands instead of orga. nic amines has 1ed to the preparation of metal phosphates and
phosphites with chira1 structures.Such examples include chiral
1D zinc phosphites C4N203H8’ZnHPO3 and fZn(HPO3)‘
(c1lN202Hl2) ,and chiral 1D zinc phosphate【Zn3(H20)’
rPO4)(HPO4)(C6H9N302)2(C6H8N302)] .However,the chiral
amino acid is easy to racemize under hydrothermal or
solvothermal conditions.Such a phenomenon was observed in
the syntheses of Zn(HPO4)(C6H9N3O2) J,Zn(HPO3)(D,|-
C6HgN3O2)(H2O)l/2IlOl and(C6H1 0N3o2)zn2(HP04)(P04)‘ H20【ll1. SiDCC 2004 Morris and co.workers[12]developed a novel
ionothermal synthesis method for preparing molecular sieves,
the ionic liquid solvent system has currently received much attention.Ionothermal synthesis[’ 一 】provides manv advan.
tagcs compared to the conventional hydrothermal and SOIvo—
thermal methods.The ionic liquid Call serve as solvent,struc—
ture・directing agent or charge compensating species.Although several zeo.type frameworks【 一 ”and inorganic-organic ma.
terials[22—28]were prepared in ionic liquids,the use of amino
acid as the ligands to synthesize inorganic open—framework
materials has not been explored yet in the ionothermal system.
Herein 1ies a new amino acid containing hybrid zinco.
phosphate monomer【Zn(HPO4)(H2PO4)][C6H10N3O2](denoted
as ZnP0.CJ58)synthesized from an ionothermal system.It can
tr ̄sform into fl layered phosphate structure(C6H10N3O2)Zn2
Corresponding authors.E・mail:lijiyang lu.edu.cn;zhenguohan@hotmail.corn Received November 26.2010;accepted March 1.2011.
Supported by the National Natural Science Foundation of China(No.20080504).