Studies on Rare Earth Complexes of Aminoacids(Ⅰ) --Synthesis and Crystal Structure of TrigJycinato-Diaquo- Praseodymium Chlorides

Abstract

Abstract: The triglycinato-diaquo-lanthanide chlorides [Ln(Gly)₃(H₂O)₂]·Cl₃·H₂O have been synthesized in the aqueous solution (Ln=Pr, Nd),The crystal structure of this complex compound has been determined by X-ray analysis as follws:Space group P2₁2₁2₁; a=4.779(1), b=12.052(3), c=30.953(11)Å; Z=4. The crystal is a one-dimentional chain complex of infinite length with three glycinic acid, NH₃⁺CH₂COO^-, serving as bridging groups connecting neighboring Pr atoms (See Fig. 2).In addrtion, there are two H₂O molecules coordinated to each Pr atom, so that the coordination number of Pr is nine, forming a distorted tricapped trigon-alprism. There is another H₃O molecule not coordinated to Pr. The three Cl^-anions are in the neighbourhood of -NH₃⁺ cations. There is no direct metal-metal bond between Pr atoms.

Key words: Rare earth, Aminoacids, Crystal structure

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Jin Tianzhu, Yang Changqing, Yang Qingchuan, Wu lingnang, Xu Guangxian . Studies on Rare Earth Complexes of Aminoacids(Ⅰ) --Synthesis and Crystal Structure of TrigJycinato-Diaquo- Praseodymium Chlorides[J]. Chem. J. Chinese Universities, 1989, 10(2): 118.

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Studies on Rare Earth Complexes of Aminoacids(Ⅰ) --Synthesis and Crystal Structure of TrigJycinato-Diaquo- Praseodymium Chlorides

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