{"doi":"10.1107/s2056989020001358","title":"Crystal structure of a nickel compound comprising two nickel(II) complexes with different ligand environments: [Ni(tren)(H<sub>2</sub>O)<sub>2</sub>][Ni(H<sub>2</sub>O)<sub>6</sub>](SO<sub>4</sub>)<sub>2</sub>","abstract":"The title compound, diaqua[tris(2-aminoethyl)amine]nickel(II) hexaaquanickel(II) bis(sulfate), [Ni(C 6 H 18 N 4 )(H 2 O) 2 ][Ni(H 2 O) 6 ](SO 4 ) 2 or [Ni(tren)(H 2 O) 2 ][Ni(H 2 O) 6 ](SO 4 ) 2 , consists of two octahedral nickel complexes within the same unit cell. These metal complexes are formed from the reaction of [Ni(H 2 O) 6 ](SO 4 ) and the ligand tris(2-aminoethyl)amine (tren). The crystals of the title compound are purple, different from those of the starting complex [Ni(H 2 O) 6 ](SO 4 ), which are turquoise. The reaction was performed both in a 1:1 and 1:2 metal–ligand molar ratio, always yielding the co-precipitation of the two types of crystals. The asymmetric unit of the title compound, which crystallizes in the space group Pnma , consists of two half Ni II complexes and a sulfate counter-anion. The mononuclear cationic complex [Ni(tren)(H 2 O) 2 ] 2+ comprises an Ni ion, the tren ligand and two water molecules, while the mononuclear complex [Ni(H 2 O) 6 ] 2+ consists of another Ni ion surrounded by six coordinated water molecules. The [Ni(tren)(H 2 O) 2 ] and [Ni(H 2 O) 6 ] subunits are connected to the SO 4 2− counter-anions through hydrogen bonding, thus consolidating the crystal structure.","journal":"Acta Crystallographica Section E Crystallographic Communications","year":2020,"id":116562,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":1,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9398,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2020-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":525235,"name":"Dalice M. Piñero Cruz","orcid":"0000-0001-6331-761X","position":1,"is_corresponding":false},{"id":544311,"name":"Karilys González‐Nieves","orcid":"0000-0002-0201-0208","position":0,"is_corresponding":true}],"reference_count":17,"raw_metadata":null,"created_at":"2026-07-18T23:13:44.286758Z","pmid":"32148867","pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}