Controllable synthesis of four series of lanthanide coordination polymers: synthesis, structures, luminescent and magnetic properties. Issue 43 (8th October 2015)

• Record Type: Journal Article
• Authors: An, Ran; Wang, Xiaofang; Hu, Huai-Ming; Zhao, Zhui; Bai, Chao; Xue, Ganglin
• Is Part Of: CrystEngComm. Volume 17:Issue 43(2015)
• Page Start: 8289
• Page End: 8299
• Publication Date: 2015-10-08
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c5ce01675d
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Four series of lanthanide coordination polymers based on 2-(2-sulfophenyl)imidazo(4, 5-f)(1, 10)-phenanthroline and glutaric acid have been hydrothermally synthesized by changing the molar ratio and the pH value. Abstract : Four series of new lanthanide coordination polymers, namely [LnL(glu)] n ·2 n H2 O (Ln = Nd (1 ), Sm (2 ), Gd (3 )), [YbL(glu)] n (4 ), [LnL(glu)(H2 O)] n (Ln = Pr (5 ), Sm (6 ), Gd (7 ), Dy (8 ), Ho (9 ), Er (10 ), Y (11 )) and [PrL(glu)(H2 O)] n (12 ) [HL = 2-(2-sulfophenyl)imidazo(4, 5-f)(1, 10)-phenanthroline, H2 glu = glutaric acid] have been hydrothermally synthesized and characterized by elemental analysis, IR spectroscopy and single crystal X-ray diffraction. The isostructural compounds1–3 exhibit 6-connected 3D networks with the topological type of pcu, containing left- and right-handed helical chains. Compound4 is a 6-connected 3D network with bsn topology, which contains unique meso -helical chains. Because of the lanthanide contraction, compounds1–3 and4 show different structures, which were all synthesized at pH = 4.0 and with the molar ratio of Ln III : HL : H2 glu = 2 : 1 : 1. When only the pH value was changed, to 6.0, the resulting isostructural compounds5–11 show 4-connected 2D sql topology with the point symbol of (4 4 ·6 2 ). By changing the molar ratio of 2 : 1 : 1 (Ln III : HL : H2 glu) to 2 : 1 : 2 at pH = 4.0, compound12 shows an 8-connected 3D network with bcu topology, which has left- and right-handed helical chains. Photoluminescence spectra of compounds1–12 have been investigated upon excitation at 370 nm. Magnetic susceptibility measurements exhibited typical paramagnetic behavior for compounds3 and7, and weak antiferromagnetic interactions for compounds8–10 .