Carboxylate Layer Research Articles

Two Distinct 2D Cd(II)/Zn(II) Networks Based on Flexible 1,2-Phenylenediacetate and N-donor Co-Ligand: Synthesis, Structure, and Fluorescent Properties

Two novel Cd(II)/Zn(II) compounds based on flexible benzene dicarboxylate and N-donor auxiliary ligands, formulated as [Cd(phda)(dpe)]n (1) and [Zn(phda)(acpy)(H2O)]n (2), have been synthesized by the hydrothermal reaction and characterized by single-crystal X-ray diffraction, elemental analysis, IR, and fluorescent spectra (phda = 1,2-phenylenediacetate, dpe = 1,2-di(4-pyridyl)-ethylene, and acpy = 4-acetylpyridine). Complex 1 displays 2D bilayer network featuring phda-bridged binuclear cadmium (II) ribbon-like chain further pillared by dpe ligand, whereas complex 2 exhibits 2D thick-layer with {4.82}-fes topology featuring phda-bridging carboxylate layer constructed by the alternate opposite helix chain. In addition, luminescent properties of the both complexes are also investigated.

A two-dimensional coordination polymer containing a two-dimensional zinc–carboxylate layer constructed from helical chains: poly[(μ4-benzene-1,2-dicarboxylato)zinc(II)

The title compound, [Zn(C(8)H(4)O(4))](n), consists of one Zn(II) cation and one benzene-1,2-dicarboxylate dianion (BDC(2-)) as the building unit. The Zn(II) cation is four-coordinated by four carboxylate O atoms from four dianionic BDC(2-) ligands in a distorted tetrahedral geometry. The Zn(II) cations are linked by the BDC(2-) ligands to generate a structure featuring two-dimensional zinc-carboxylate layers containing left- and right-handed helical chains. The two-dimensional layers are stacked along the a direction. The thermal stability of the title compound has been studied.

Conditions for a large cathodic sequestration of carbon dioxide into glassy carbon. Generation of a carbon poly-carboxylate versatile material

Carbon dioxide (being one of the most important pollutants of modern civilisations) is known to be poorly reactive under electron transfer. At a glassy carbon electrode, a saturated solution of CO2 in N,N,-dimethylformamide (DMF) containing tetramethylammonium salts exhibits a large reduction step (threshold a about −1.7V vs. Ag/AgCl). This step progressively vanishes upon recurrent scans. This behavior suggests that the main electrode reaction is the cathodic charge of GC (allowing the formation of a poly-nucleophilic species) followed by its reaction with electrophilic CO2 species. A dense poly-carboxylation of the material is confirmed by its derivatization with organic electrophiles (formation of redox-marked esters). Moreover, the destruction of the carboxylate layer could be simply achieved by anodic oxidation of this material (analogous to a non-Kolbe reaction with evolution of CO2). This supports a very large multi-layer character of carboxylation deeply affecting the carbon bulk.

Characterization of different functionalized lipidic nanocapsules as potential drug carriers.

Lipid nanocapsules (LNC) based on a core-shell structure consisting of an oil-filled core with a surrounding polymer layer are known to be promising vehicles for the delivery of hydrophobic drugs in the new therapeutic strategies in anti-cancer treatments. The present work has been designed as basic research about different LNC systems. We have synthesized—and physico-chemically characterized—three different LNC systems in which the core was constituted by olive oil and the shell by different phospholipids (phosphatidyl-serine or lecithin) and other biocompatible molecules such as Pluronic® F68 or chitosan. It is notable that the olive-oil-phosphatidyl-serine LCN is a novel formulation presented in this work and was designed to generate an enriched carboxylic surface. This carboxylic layer is meant to link specific antibodies, which could facilitate the specific nanocapsule uptake by cancer cells. This is why nanoparticles with phosphatidyl-serine in their shell have also been used in this work to form immuno-nanocapsules containing a polyclonal IgG against a model antigen (C-reactive protein) covalently bounded by means of a simple and reproducible carbodiimide method. An immunological study was made to verify that these IgG-LNC complexes showed the expected specific immune response. Finally, a preliminary in vitro study was performed by culturing a breast-carcinoma cell line (MCF-7) with Nile-Red-loaded LNC. We found that these cancer cells take up the fluorescent Nile- Red molecule in a process dependent on the surface properties of the nanocarriers.

Assembly of Discrete One-, Two-, and Three-Dimensional Zn(II) Complexes Containing Semirigid V-Shaped Tricarboxylate Ligands

Hydrothermal reaction of zinc nitrate, 4-(4-carboxyphenoxy)phthalate acid (H3cpop), and different N-donor coligands has afforded six novel supramolecular compounds, in which the nature of the neutral coligands plays a crucial structure-directing role. [Zn(Hcpop)(H2O)3]n (1) and [Zn(Hcpop)(phen)(H2O)]n (2, phen = 1,10-phenanthroline) form three-dimensional (3D) supramolecular frameworks linked by H-bonds and π–π interactions based on discrete molecules. Similarly, [Zn2(Hcpop)2(4,4′-bpy)3(H2O)2]n·4nH2O (3) possesses a 3D supramolecular structure, aggregated by interesting one-dimensional (1D) armed-polyrotaxane chains. [Zn6(cpop)4(4,4′-bpy)2(H2O)2]n (4, 4,4′-bpy = 4,4′-bipyridine) exhibits a complicated 3D framework, which can be rationalized as a (3,6,6)-connected trinodal net with a unique (4.62)2(42.69.83.10)(44.68.83) topology. [Zn3(cpop)2(bpdb)(H2O)2]n (5, bpdb = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene) is a 3D structure containing two-dimensional (2D) metal–carboxylate layers motifs, which are furt...

Three Zn(ii) metal–organic frameworks assembled from a versatile tecton 5-ethyl-pyridine-2,3-dicarboxylate and dipyridyl-type coligand

Solvothermal reactions of 5-ethyl-pyridine-2,3-dicarboxylic acid and dipyridyl-type ligands with Zn(Ac)2·2H2O afford three metal–organic frameworks, including {[Zn2(EPDA)2(BPP)2]·(H2O)}n(1), [Zn3(EPDA)2(HEPDA)2(BPE)]n (2) and [Zn3(EPDA)2(HEPDA)2(BPA)]n (3) (H2EPDA = 5-ethyl-pyridine-2,3-dicarboxylic acid, BPP = 1,3-di(4-pyridyl)propane, BPE = 1,2-di(4-pyridyl)ethylene and BPA = 1,2-bi(4-pyridyl)ethane). The pronounced structure for 1 represents a rare 2D → 3D interpenetrated framework with new layer motif featuring a 4-connected net signified as Schlafli symbol of (3.64.8)(32.6.72.8). Complexes 2 and 3 possess intimately related structures featuring infinite Zn carboxylate layers of [Zn3(EPDA)2(HEPDA)2]n pillared by a BPE (or BPA) molecule to produce the three-dimensional frameworks with pcu topology based on the Zn trimers as the 6-connected nodes. It is shown that the flexible degree of dipyridyl-type molecules plays a key role for the assembly of diversified coordination networks. Furthermore, thermal degeneration and fluorescence properties of all three complexes are also investigated.

Two novel 3D 3d–4f polymers with 5-(isonicotinamido)isophthalic acid: Synthesis, structures and properties

Two new 3d–4f heterometallic coordination polymers [Mn0.5Ln(INAIP)2(H2O)2]·2H2O [Ln=Eu (1), Gd (2)] have been prepared by hydrothermal reactions of the corresponding lanthanide salt with 5-(isonicotinamido)isophthalic acid (H2INAIP) in the presence of MnCO3 and NaOH. Both complexes have been characterized by single crystal X-ray diffraction analyses, elemental analyses, infrared absorption spectra, and thermogravimetric analyses. The results of structural analyses show that 1 and 2 are isostructural and feature non-interpenetrated 3D coordination framework containing 2D (4,4) lanthanide–carboxylate layers. They have the same 3D structure with trinodal (3,3,4)-connected new topology net with Point (Schläfli) symbol (83)4(84·102)(86)2. In addition, photoluminescence and magnetic properties were also investigated.

Syntheses, crystal structures and properties of two unusual pillared-layer 3 d–4 f Ln–Cu heterometallic coordination polymers

Two unusual pillared-layer 3 d–4 f Ln–Cu heterometallic coordination polymers, {[ Ln 2Cu 5Br 4(IN) 7(H 2O) 6]·H 2O} n ( Ln=Eu ( 1) and Gd ( 2), HIN=isonicotinic acid), have been synthesized under hydrothermal conditions, and characterized by elemental analysis, IR, thermal analysis and single-crystal X-ray diffraction. The structure determination reveals that 1 and 2 are isostructural and feature a novel three-dimensional pillared-layer hetrometallic structure built upon the linkages of one-dimensional (1D) linear Ln–carboxylate chains, zero-dimensional (0D) Ln–carboxylate Ln 2(IN) 8 dimers, rare 1D zigzag [Cu 5Br 4] n inorganic chains and IN − pillars. In both 3D structures, there are Ln–carboxylate layers resulted from the connections of 1D Ln–carboxylate chains and 0D Ln 2(IN) 8 dimers through O–H⋯O hydrogen bondings. The luminescent properties of 1 have been investigated. The magnetic properties of 1 and 2 have also been studied.

Biodistribution Study of Nanometric Hybrid Gadolinium Oxide Particles as a Multimodal SPECT/MR/Optical Imaging and Theragnostic Agent

Nanometric hybrid gadolinium oxide particles (Gado-6Si-NP) for diagnostic and therapeutic applications (mean diameter 3-4 nm) were obtained by encapsulating Gd(2)O(3) cores within a polysiloxane shell, which carries organic fluorophore (Cy 5) and is derivatized by a hydrophilic carboxylic layer. As residency time in the living body and methods of waste elimination are crucial to defining a good nanoparticle candidate and moving forward with steps for validation, this study was aimed at evaluating the biodistribution of these multimodal Gado-6Si-NP in rodents. Gado-6Si-NP were imaged following intravenous injection in control Wistar rats and mice using MRI (7 T), optical fluorescent imaging, and SPECT. A clear correlation was observed among MRI, optical imaging, and SPECT regarding the renal elimination. Quantitative biodistribution using gamma-counting of each sampled organ confirmed that these nanoparticles circulated freely in the blood pool and were rapidly cleared by renal excretion without accumulation in liver and RES uptake. These results demonstrate that Gado-6Si-NP display optimal biodistribution properties, enabling them to be developed as multimodal agents for in vivo imaging and theragnostics, especially in oncological applications.

Electrochemical deposition of a copper carboxylate layer on copper as potential corrosion inhibitor

Carboxylic acids and sodium carboxylates are used to protect metals against aqueous and atmospheric corrosion. In this paper, we describe the application of a layer of copper carboxylate on the surface of a copper electrode by means of cyclic voltammetry technique and tests which measure the corresponding resistance to aqueous corrosion. Unlike the soaking process, which also forms a film on the surface, the use of cyclic voltammetry allows one to follow the deposition process of the copper carboxylates onto the electrode. The modified electrodes have been characterised with infrared spectroscopy. In addition, the corrosion resistance of the film has been investigated using polarisation resistance and Tafel plot measurements.

Two Novel Isostructural 3D Ln–Sr (Ln = Eu; Gd) Coordination Polymers Based on Oxalate Ligands with Unusual Topology: Synthesis, Crystal Structures, and Luminescence

AbstractThe self‐assembly of oxalic acid with metal salts under hydrothermal conditions gave two isostructural 3D lanthanide alkaline earth heterometallic coordination polymers, [Ln2Sr(OX)4(H2O)6·3H2O]n [Ln = Eu (1), Gd (2); OX = oxalate]. Compounds 1 and 2 are 3D coordination frameworks built from 2D lanthanide carboxylate layers and SrO9 units by sharing OX ligands with the unusual 2,5‐connected (16)3(84.122.164)2(8)4 net. Furthermore, the luminescent property of complex 1 was investigated.

Two 3D Triazolate−Tricarboxylate-Bridged CuII/I Frameworks by One-Pot Hydrothermal Synthesis Exhibiting Spin-Canted Antiferromagnetism and Strong Antiferromagnetic Couplings

Two 3D coordination polymers with the same components but different structures, [Cu(II)(2)Cu(I)(trz)(3)(Hbtc)](n) (1) and [Cu(4)(Htrz)(2)(mu(3)-OH)(2)(btc)(2)](n) (2), were obtained together by a one-pot hydrothermal reaction of Cu(OAc)(2).H(2)O, 1,2,4-triazole (Htrz), and 1,3,5-benzenetricarboxylic acid (H(3)btc). Complex 1 is a mixed-valence Cu(I/II) honeycomb built from wavy Cu(II)-trz-carboxylate layers and Cu(I) nodes with doubly deprotonated Hbtc(2-) ligands covalently filled in the channels. In contrast, 2 is a tetranuclear [Cu(4)(Htrz)(2)(mu(3)-OH)(2)](6+) cluster-based framework extended by a fully deprotonated btc(3-) ligand, displaying a 3,6-connected topological network. More interestingly, spin-canted antiferromagnetism and overall strong antiferromagnetic couplings up to -147.1 cm(-1) are respectively observed for 1 and 2, which are significantly due to the antisymmetric magnetic exchange in the wavy Cu(II)-trz-carboxylate sublayer of 1 and the cooperative 4-fold heterobridges within the tetranuclear cluster of 2.

Syntheses, structures and properties of copper(II) and cobalt(II) metal–organic frameworks based on R-isophthalate (R = –CH 3 or –C(CH 3) 3) and 1,1′-(1,4-butanediyl)bis(imidazole) ligands

Three new complexes [Cu 2(mip) 2(bbi)] n ( 1), {[Cu 2(tbip) 2(bbi) 2(H 2O)]·2H 2O} n ( 2) and {[Co 2(tbip) 2(bbi) 2]·2H 2O} n ( 3), were prepared through hydrothermal reactions of Cu(II) and Co(II) acetate with H 2mip or H 2tbip (H 2mip = 5-methyl isophthalic acid and H 2tbip = 5-tert-butyl isophthalic acid) and the flexible ligand bbi (bbi = 1,1′-(1,4-butanediyl)bis(imidazole)). All these complexes were structurally characterized by elemental analysis, IR spectroscopy and X-ray single-crystal diffraction. Complex 1 exhibits a 3D network, which are constructed from 2D carboxylate layer and bbi pillar. Complex 2 possesses a 2D layer structure, and exists extensive hydrogen-bonding interactions, while complex 3 is constructed from 2D layers which consists of alternating left- and right-handed helical chains, and further assembled to form a 3D framework by hydrogen-bonding interactions. The thermal stabilities of the corresponding complexes have been briefly investigated. In addition, dominant antiferromagnetic coupling was observed in complex 1.

Multi-dimensional transition-metal coordination polymers with 5-nitro-1,2,3-benzenetricarboxylic acid exhibiting ferro-/antiferromagnetic interactions

Six transition metal coordination polymers, [Cu(3)(nbta)(2)(bipy)(2)(H(2)O)(2)] x 2 H(2)O (1), [Cu(3)(nbta)(2)(bpp)(2)(H(2)O)(2)] x 2 H(2)O (2), [Co(3)(nbta)(2)(bipy)(3)(H(2)O)(2)] x 2 H(2)O (3), [Co(3)(nbta)(2)(bpp)(2)(H(2)O)(2)] (4), [Ni(2)(Hnbta)(2)(bipy)(2)(H(2)O)(2)] (5) and [Ni(3)(nbta)(2)(bpa)(3)(H(2)O)(2)] x 2 H(2)O (6) (H(3)nbta = 5-nitro-1,2,3-benzenetricarboxylic acid, bipy = 4,4'-bipyridine, bpa = 1,2-bis(4-pyridyl)ethane, bpp = 1,3-bis(4-pyridyl)propane), have been hydrothermally synthesized by the reactions of Cu(II), Co(II) and Ni(II) salts with H(3)nbta in the presence of dipyridyl-type co-ligands, respectively. Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, and TG analyses. Compounds 1-4 and 6 exhibit 3D pillared-layer structures while compound 5 has a 2D layer. The nbta(3-) ligands in the 2D carboxylate layer motifs of 1-4 and 6 connect transition metal ions in different coordination modes, and the dipyridyl-type co-ligands in compounds 1-4 and 6 serve as the pillar between the 2D layers, creating 3D open frameworks. From a topologic point of view, complex 1, 2 and 4 present 4-connected 3D coordination frameworks with the topologies of (4(2) x 6(2) x 8(2)) (6(2) x 7(2) x 8(2)) (4(2) x 6(2) x 7 x 8), (6(4) x 8(2)) (4(2) x 6(4)) (4(2) x 6(4)) and (4 x 6(4) x 8)(4(4) x 6(2))(4(3) x 6(3)) respectively. Complex 3 shows a (4,5)-connected 3D network with (4(2) x 6(7) x 8)(6(4) x 8(2))(4(2) x 6(4)) topology. Whereas the structure of 5 is a 2D (4,4) net due to the partially deprotonated H(3)nbta ligand existed. Complex 6 features a 3D (4,5)-connected framework with (4 x 6(8) x 8) (6(5) x 8) (4 x 6(5)) topology, also exhibiting the intriguing helical motif. The variable-temperature magnetic susceptibility studies reveal antiferromagnetic interactions between Cu(II) or Co(II) ions in 1, 2, 3, 4 and ferromagnetic interactions between Ni(II) ions for 5 and 6, respectively.

Synthesis, crystal structures, luminescent and thermal properties of two new metal–organic coordination polymers based on zinc(ii) carboxylates

Two new metal–organic coordination polymers, [NH2(CH3)2]2[Zn3(bdc)4]·DMF·H2O (1) (H2bdc = 1,4-benzenedicarboxylic acid) and [NH2(CH3)2]2[Zn3(bpdc)4]·5DMF (2) (H2bpdc = 4,4′-biphenyldicarboxylic acid), were synthesized by heating a DMF solution of Zn(NO3)2·6H2O, [NH2(CH3)2]Cl and organic carboxylic acids. Single-crystal X-ray structure analysis reveals that these compounds have 3D anionic framework structures built from zinc(II) carboxylate layers linked by carboxylate anions. Compounds 1 and 2 were characterized by IR, TGA and XRPD, and their luminescent properties were also investigated.

Rationally designed and controlled syntheses of different series of 4d–4f heterometallic coordination frameworks based on lanthanide carboxylate and Ag(IN)2 substructures

Different series of Ln(III)–Ag(I) heterometallic coordination frameworks, namely LnAg(OAc)(IN)2(H2O)·(ClO4) [Ln = Tb (1a); Ho (1b), HOAc = acetic acid, HIN = isonicotinic acid], LnAg2(OX)0.5(IN)3(H2O)1.5·(ClO4) [Ln = Nd (2a); Eu (2b) Tb (2c), OX = oxalate], Eu2Ag3(OX)0.5(IN)6(NO3)(ClO4)(H2O)3·2(H2O) (3), LnAg(OX) (IN)2(H2O) [Ln = Ce (4a); Sm (4b)], LnAg(Mal)(IN)2(H2O) [Ln = La (5a); Nd (5b), H2Mal = malonic acid], Ln3Ag4(Lac)2(IN)8(H2O)5·2(ClO4)·2.5(H2O) [Ln = La (6a); Lu (6b), HLac = lactic acid], Sm3Ag4(Lac)2(IN)8(H2O)4·2(ClO4)·2.5(H2O) (7), and Eu2Ag3(S-Lac)(IN)6(H2O)4·2(ClO4)·4(H2O) (8) were successfully synthesized by systematic variation of reaction parameters such as initial reactants, reaction time, pH, temperature, etc. Compounds 1a and 1b represent 3D coordination frameworks that are constructed from adjacent lanthanide carboxylate layers and pillared Ag(IN)2 units. Compounds 2a, 2b and 2c comprise of 2D Ln-carboxylate-Ag layered networks and pillared Ag(IN)2 units. Compound 3 exhibits 3D coordination frameworks that are built up from the assembly of europium-carboxylate layers and pillared Ag(IN)2 units. 3D coordination networks of compounds 4a and 4b containing tetranuclear Ln2Ag2 cores are constructed from 2D cerium oxalate layers and tilted pillared Ag(IN)2 subunits. Compounds 5a and 5b display attractive 3D coordination frameworks constructed of 2D lanthanum malonate chains and pillared Ag(IN)2 units. Compounds 6a and 6b are 2D coordination frameworks comprised of 1D racemic lanthanum carboxylate chains and pillared Ag(IN)2 units. The crystal structure of 7 is almost the same as that of 6a and 6b, only one less coordination water molecule is coordinated to its metal centre. Compound 8, which spontaneously resolved upon crystallization, represents the first example of a 3D Ln–Ag coordination framework built up from 1D europium-carboxylate chains containing chiral molecules and pillared Ag(IN)2 units.

Dynamics of a Nitroxide Layer Grafted onto Porous Silicon

This paper reports a rapid electron spin resonance method to assess the dynamical properties of spin-labeled alkyl carboxylate layers, covalently linked onto a porous silicon substrate. IR and X-ray photoelectron spectroscopy analyses complemented the ESR study by proving the successful grafting of the organic radical and coverage of the surface.

A dihydroxidotetracopper(II) framework supported by 4,4′-(adamantane-1,3-diyl)bis(1,2,4-triazole) and benzene-1,3,5-tricarboxylate bridges

The new bifunctional ligand 4,4'-(adamantane-1,3-diyl)bis(1,2,4-triazole) (tr(2)ad) and benzene-1,3,5-tricarboxylate sustain complementary coordination bridging for the three-dimensional framework of poly[[bis[mu(3)-4,4'-(adamantane-1,3-diyl)bis(1,2,4-triazole)-kappa(3)N(1):N(2):N(1')]bis(mu(4)-benzene-1,3,5-tricarboxylato-kappa(4)O(1):O(1'):O(3):O(5))di-mu(3)-hydroxido-kappa(6)O:O:O-tetracopper(II)] dihydrate], {[Cu(4)(C(9)H(3)O(6))(2)(OH)(2)(C(14)H(18)N(6))(2)].2H(2)O}(n). The net node is a centrosymmetric (mu(3)-OH)(2)Cu(4) cluster [Cu-O = 1.9525 (14)-2.0770 (15) A and Cu...Cu = 3.0536 (5) A] involving two independent copper ions in tetragonal pyramidal CuO(4)N and trigonal bipyramidal CuO(3)N(2) environments. One carboxylate group of the anion is bridging and the other two are monodentate, leading to the connection of three hydroxide clusters and the generation of neutral coordination layers separated by 9.3583 (5) A. The interlayer linkage is effected by mu(3)-tr(2)ad ligands, with one triazole group N(1):N(2)-bridging and the second monodentate [Cu-N = 1.9893 (19), 2.010 (2) and 2.411 (2) A]. In total, the hydroxide clusters are linked to six close neighbors within the carboxylate layer and to four neighbors via tr(2)ad bridges. Hydrogen bonding of solvent water molecules to noncoordinated triazole N atoms and carboxylate groups provides two additional links for the net, which adopts a 12-connected topology corresponding to hexagonal closest packing. The study also introduces a new type of bis(triazole) ligand, which may find wider applications for supramolecular synthesis.

3D pillar-layered coordination polymers based on 4d–4f heterometallic assembly

By control of mixed ligands with particular coordination sites, heterometallic coordination polymers, [Ln 2(H 2O) 2Ag(C 2O 4) 2(ina) 3] n (Ln = Eu ( 1), Dy ( 2), Hina = isonicotinic acid) and {[LnAg(C 2O 4)(na) 2]·2H 2O} n (Ln = La ( 3), Tb ( 4), Hna = nicotinic acid), have been synthesized under hydrothermal conditions and characterized by elemental analysis, IR, thermogravimetric analysis (TGA), and single-crystal X-ray diffraction. These coordination polymers feature 3D pillar-layered coordination frameworks constructed from two-dimensional (2D) lanthanide–carboxylate layers and Ag(ina) or Ag(na) pillars. It is interesting that the in situ decarboxylation of pyridine-2,3-dicarboxylic acid into nicotinic acid was observed. The luminescent properties of 1 and 4 were also studied.

Syntheses, structures and photoluminescence of two 3D pillared metal-organic frameworks with unique (4 11·6 4)(4 10·6 5) topology based on two kinds of topologically nonequivalent nodes

The hydrothermal reactions of Sr(NO 3) 2 or BaCl 2 with 5-sulfoisophthalic acid (H 3SIP) in the presence of triethylamine yielded two novel 3D coordination polymers [M(HSIP)(H 2O)] n (M = Sr ( 1) and Ba ( 2)). Single-crystal X-ray analyses revealed that the two compounds are isostructural. The [M(HSIP)(H 2O)] n compound displays a 3D pillared framework featuring a 2D metal sulfonate–carboxylate layer, and has two kinds of topologically nonequivalent six-connected nodes based on Sr ions and HSIP ligands with a rare (4 11·6 4)(4 10·6 5) topology. In the solid state, both 1 and 2 show blue photoluminescence with the maximum emission intensities at 445 and 439 nm upon excitation at 325 and 328 nm, respectively.