Synthesis of Zinc-Based Complex and Exploration of Fluorescence Sensing Performance for Fe3+ in Aqueous Solutions

doi:10.16553/j.cnki.issn1000-985x.2025.0145

Abstract

Abstract: A novel zinc-based complex， Zn₂（H₂PZTC）₂·0.08DMSO·4C₂H₇N·2H₂O （complex 1，H₄PZTC=pyrazine-2，3，5，6-tetracarboxylic acid， C₈O₈N₂H₄， DMSO=dimethyl sulfoxide， C₂H₆SO）， was successfully synthesized via the solvothermal method using zinc nitrate and pyrazine-2，3，5，6-tetracarboxylic acid as raw materials. The structure of the complex 1 was characterized by single crystal X-ray diffraction， powder X-ray diffraction， infrared spectroscopy and thermogravimetry analysis. The zinc ions formed two secondary building units through protonated pyrazine-2，3，5，6-tetracarboxylic acid in complex 1. The building units interlace to form a two-dimensional layered structure， which further assembles into a three-dimensional supramolecular structure through weak hydrogen bond interactions. Fluorescence studies reveal that complex 1 exhibits competitive absorption toward Fe³⁺ resulting in significant fluorescence quenching and a low detection limit for Fe³⁺.

Key words: zinc-based complex; solvothermal method; supramolecular structure; fluorescence probe; ion detection

CLC Number:

O614.24^＋1

GUO Xinyu, CHEN Wei, YAO Wei, GAO Enjun. Synthesis of Zinc-Based Complex and Exploration of Fluorescence Sensing Performance for Fe³⁺ in Aqueous Solutions[J]. Journal of Synthetic Crystals, 2026, 55(1): 120-127.

Figures/Tables 18

References 31

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Complex	C_24.16 H_36.48 N₈ O_18.08 S_0.08 Zn₂	CCDC	2466320
Formula weight	744.40	μ/mm^-1	1.461
Temperature/K	150.0	F_（000）	753.0
Crystal system	Triclinic	Crystal size/mm³	0.24×0.22×0.2
Space group	P1	Radiation	Mo Kα（λ=1.541 78 Å）
a/nm	1.093 62（2）	2θ range for data collection/（°）	6.16 to 149.494
b/nm	1.124 53（2）	Index range	-13≤h≤13， -14≤k≤14， -18≤l≤17
c/nm	1.439 30（3）	Reflections collected	22 346
α/（°）	87.860 0（10）	Independent reflections	6 965 ［R_int=0.029 3， R_sigma=0.033 6］
β/（°）	85.768 0（10）	Data/restraints/parameters	6 965/0/343
γ/（°）	79.127 0（10）	Goodness-of-fit on F²	1.047
Volume/nm³	1.733 05（6）	Final R indexes ［I≥2σ （I）］	R₁=0.085 0， wR₂=0.241 8
Z	2	Final R indexes ［all data］	R₁=0.087 7， wR₂=0.247 2
ρ_calc/（g·cm^-3）	1.427	Largest diff. peak/hole/（e·Å^-3）	1.22/-0.73

Complex	C_24.16 H_36.48 N₈ O_18.08 S_0.08 Zn₂	CCDC	2466320
Formula weight	744.40	μ/mm^-1	1.461
Temperature/K	150.0	F_（000）	753.0
Crystal system	Triclinic	Crystal size/mm³	0.24×0.22×0.2
Space group	P1	Radiation	Mo Kα（λ=1.541 78 Å）
a/nm	1.093 62（2）	2θ range for data collection/（°）	6.16 to 149.494
b/nm	1.124 53（2）	Index range	-13≤h≤13， -14≤k≤14， -18≤l≤17
c/nm	1.439 30（3）	Reflections collected	22 346
α/（°）	87.860 0（10）	Independent reflections	6 965 ［R_int=0.029 3， R_sigma=0.033 6］
β/（°）	85.768 0（10）	Data/restraints/parameters	6 965/0/343
γ/（°）	79.127 0（10）	Goodness-of-fit on F²	1.047
Volume/nm³	1.733 05（6）	Final R indexes ［I≥2σ （I）］	R₁=0.085 0， wR₂=0.241 8
Z	2	Final R indexes ［all data］	R₁=0.087 7， wR₂=0.247 2
ρ_calc/（g·cm^-3）	1.427	Largest diff. peak/hole/（e·Å^-3）	1.22/-0.73

D—H…A	d（D—H）/nm	d（H…A）/nm	d（D…A）/nm	∠D—H…A/（°）
N（2）—H（2）…O（6）	0.88	0.236	0.275 4（9）	107
N（2）—H（2）…O（16）	0.88	0.213	0.289 0（10）	145
N（6）—H（6）…O（4）	0.88	0.253	0.321 5（8）	135
C（2）—H（2B）…O（10）	0.98	0.242	0.333 4（17）	154
C（2）—H（2B）…O（18）	0.98	0.246	0.327 7（17）	141
C（5）—H（5C）…O（12）	0.98	0.243	0.339 3（10）	168
C（9）—H（9B）…O（18）	0.98	0.244	0.314 1（11）	128
C（17）—H（17A）…O（15）	0.98	0.232	0.322 1（15）	152

D—H…A	d（D—H）/nm	d（H…A）/nm	d（D…A）/nm	∠D—H…A/（°）
N（2）—H（2）…O（6）	0.88	0.236	0.275 4（9）	107
N（2）—H（2）…O（16）	0.88	0.213	0.289 0（10）	145
N（6）—H（6）…O（4）	0.88	0.253	0.321 5（8）	135
C（2）—H（2B）…O（10）	0.98	0.242	0.333 4（17）	154
C（2）—H（2B）…O（18）	0.98	0.246	0.327 7（17）	141
C（5）—H（5C）…O（12）	0.98	0.243	0.339 3（10）	168
C（9）—H（9B）…O（18）	0.98	0.244	0.314 1（11）	128
C（17）—H（17A）…O（15）	0.98	0.232	0.322 1（15）	152

Synthesis of Zinc-Based Complex and Exploration of Fluorescence Sensing Performance for Fe³⁺ in Aqueous Solutions

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