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One-dimensional chain oxalic acid rare earth coordination polymer and preparation method and application thereof
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A technology of coordination polymers and oxalic acid, which is applied in chemical instruments and methods, compounds containing Group 3/13 elements of the periodic table, luminescent materials, etc. Short life and other problems, to achieve the effect of good complexation, large Stokes displacement and strong coordination ability
Inactive Publication Date: 2014-05-07
HARBIN INST OF TECH
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[0003] The purpose of the present invention is to solve the problem that the types of existing near-infrared light-emitting coordination polymers are scarce and the near-infrared light-emitting life is short. The present invention provides a one-dimensional chain rare earth oxalate coordination polymer and its preparation method and application
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specific Embodiment approach 1
[0014] Specific embodiment one: this embodiment is a one-dimensional chain rare earth oxalate coordination polymer, which is based on Ln(HC 2 o 4 )(C 2 o 4 )(H 2 O) 5 As a structural unit, it is bridged into a one-dimensional chain structure through the oxygen atoms in oxalic acid. where Ln is Pr 3+ or Nd 3+ .
[0015] The chemical formula of the one-dimensional chain rare earth oxalate coordination polymer of the present embodiment is expressed as [Ln(HC 2 o 4 )(C 2 o 4 )(H 2 O) 5 ] n , where Ln is Pr 3+ or Nd 3+ .
[0016] The schematic diagram of the molecular structure of the one-dimensional chain rare earth oxalate coordination polymer of the present embodiment is as follows figure 1 As shown, 1 in the figure is the central rare earth ion (Pr 3+ or Nd 3+ ), 2, 3, 4, 5 and 6 are marked with five water molecular oxygens, 7 is a carbonyl oxygen provided by an oxalic acid, 8 and 9 are two carbonyl oxygens provided by another oxalic acid, forming an eight-co...
specific Embodiment approach 2
[0018] Embodiment 2: This embodiment differs from Embodiment 1 in that one-dimensional chain rare earth oxalate coordination polymers are connected by hydrogen bonds to form a three-dimensional supramolecular structure of rare earth oxalate coordination polymers. Other parameters are the same as in the first embodiment.
[0019] The structure schematic diagram of the rare earth oxalate coordination polymer of the supramolecular structure in this embodiment is shown in FIG. 2 .
specific Embodiment approach 3
[0020] Specific embodiment three: This embodiment is the preparation method of the one-dimensional chain rare earth oxalate coordination polymer described in specific embodiment one, which is realized by the following steps: 1. At room temperature, the pentahydrate rare earth nitrate Add oxalic acid into solvent water, stir to dissolve, and then adjust the pH value to 7-9 to obtain a reaction solution, wherein the molar ratio of pentahydrate rare earth nitrate to oxalic acid is 1:1, and pentahydrate rare earth nitrate is Pr(NO 3 ) 3 ·5H 2 O or Nd(NO 3 ) 3 ·5H 2 O; 2. Put the reaction solution in step 1 into a stainless steel reactor lined with polytetrafluoroethylene, seal the reactor, then heat it to 150-180°C, and keep it warm for 3-5 days to obtain a one-dimensional chain Rare earth oxalate coordination polymer.
[0021] The yield of the preparation method of this embodiment is about 60%.
[0022] The preparation method of this embodiment adopts cheap oxalic acid and ...
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Abstract
The invention discloses a one-dimensional chain oxalic acid rare earth coordination polymer and a preparation method and application thereof, which relate to an oxalic acid rare earth coordination polymer and a preparation method and application thereof and are used for solving the problems of few types and short near infrared luminescent lifetime existing in the conventional near infrared luminescent coordination polymer. The oxalic acid rare earth coordination polymer has a one-dimensional chain structure formed by bridging Ln(HC2O4)(C2O4)(H2O5) serving as a structural unit through an oxygen atom bridge in oxalic acid, wherein Ln is Pr<3+> or Nd<3+>. A three-dimensional super-molecular structure of a one-dimensional chain is realized through a hydrogen bond. The preparation method comprises the following steps of: adding rare earth nitrate and oxalic acid into water; dissolving and adjusting the pH; and heating and reacting in a hermetic reaction kettle. The oxalic acid rare earth coordination polymer has near infrared luminance. An eight-coordination structure is formed by taking a rare earth ion as the center, the fluorescent lifetime of an oxalic acid rare earth praseodymium coordination polymer is 3.52 mus, and the dual-exponential attenuation fluorescent lifetime of an oxalic acid rare earth neodymium coordination polymer is 1.07 mus and 7.86 mus.
Description
technical field [0001] The invention relates to a rare earth oxalate coordination polymer, a preparation method and application thereof. Background technique [0002] Rare earth ions have high coordination numbers and good luminescent properties, and are widely used as luminescent materials in color TV and computer monitors, lighting, medicine and military fields. In recent years, near-infrared luminescence based on complexes of rare-earth ions has attracted much attention, however, direct excitation of Ln(III) ions (trivalent rare-earth ions) is usually ineffective due to the weak absorption of rare-earth ion f–f, when using the " After the "antenna effect", the emission of metals becomes more effective. There are not many types of rare earth ion complexes with near-infrared luminescent properties, and the near-infrared luminescent lifetime is short, which still needs to be improved. Contents of the invention [0003] The object of the present invention is to solve the ...
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