Title: Structural and Photochemical Properties of Zn(II) Phenanthroline-Derived Complexes: From Mononuclear to Bimetallic and Circular-Trimetallic Helicates

Journal Article · · Inorganic Chemistry

In the design of self-assembled compounds, small variations in the linkers connecting the coordinating moieties can produce large differences in the obtained structures. In this paper, we report three novel zinc(II) complexes with phenanthroline-derived ligands as building blocks (L1–L3): A mononuclear complex, a bimetallic helicate, and a trimetallic circular helicate. The even-number spacer in L2 promotes the formation of a bimetallic helicate stabilized by π-π interactions of adjacent phenanthrolines. The addition of an extra methylene in L3 increases the distance between where the phenanthrolines can stack, and CH-π noncovalent interactions give stability to the circular helicate. When irradiated at 308 nm in acetonitrile, long-lived excited states are formed with all three complexes, which are able to participate in oxidation of 2-propanol and in reduction of methylviologen, MV2+. While the overall behavior of the three complexes is similar, the bimetallic helicate is able to form a ground-state adduct with MV2+, while the trimer reaches the excited state to form an exciplex with MV2+.

Research Organization:
University of California, Oakland, CA (United States); University of Notre Dame, IN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231; FC02-04ER15533
OSTI ID:
1799649
Journal Information:
Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 3 Vol. 59; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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